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WO2007017967A1 - Etiquette sans fil a circuit integre - Google Patents

Etiquette sans fil a circuit integre Download PDF

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Publication number
WO2007017967A1
WO2007017967A1 PCT/JP2006/304052 JP2006304052W WO2007017967A1 WO 2007017967 A1 WO2007017967 A1 WO 2007017967A1 JP 2006304052 W JP2006304052 W JP 2006304052W WO 2007017967 A1 WO2007017967 A1 WO 2007017967A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
wireless
tag
interrogator
length
Prior art date
Application number
PCT/JP2006/304052
Other languages
English (en)
Japanese (ja)
Inventor
Hisao Tanabe
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to JP2007529456A priority Critical patent/JPWO2007017967A1/ja
Publication of WO2007017967A1 publication Critical patent/WO2007017967A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/22—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element
    • H01Q19/24—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element the primary active element being centre-fed and substantially straight, e.g. H-antenna

Definitions

  • the present invention relates to an antenna, and more particularly to a technique effective when applied to an antenna for RFID (Radio Frequency Identification).
  • RFID Radio Frequency Identification
  • a system using RFID will be described as an example of using a wireless communication device.
  • a system using RFID is composed of an interrogator having a read or read / write function and a responder called a wireless IC tag.
  • batteryless tags that detect radio waves transmitted from interrogators and use them as drive power have appeared, and various uses are being studied in many fields.
  • a system using RFID can be easily configured, it can automatically manage or sort items such as product management in a production line or warehouse or store, automatic sorting of items, postal delivery, and home delivery. Applications in a wide range of fields, such as distribution confirmation and logistics, are being considered.
  • Patent Document 1 discloses an article management system as shown in FIG.
  • the common radio wave reflector 94 is separated from the wireless IC tag 93 by a distance L in parallel with the wireless IC tag 93 as a responder.
  • the signal having the interrogator power is reflected by the common radio wave reflector 94, thereby increasing the electric field strength of the radio wave to the wireless IC tag 93 as the responder.
  • techniques related to such an antenna include, for example, techniques described in Patent Document 2 and Non-Patent Documents 1 and 2.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-250185
  • Patent Document 2 Japanese Translation of Special Publication 2004-511156
  • Non-Patent Document 1 KMChen, RWPKing, “Dipole 'Antennas' Coupled 'Elect Mouth Magnetic' Toe '' Two Wire 'Transmission Line (Dipole antennas coupled electromagnetically to a two-wire transmission line)', Eye 'R''IRE transactions on antennas and propagation; (USA), The' Institut ' ⁇ ' Off 'Huno' Engineers, September 1961, p. 425-432
  • Patent Document 2 "Antenna Engineering Handbook", 1st edition, The Institute of Electronics, Information and Communication Engineers, 1 October 30, 980, p. 412
  • wireless IC tags in a wide range of fields such as distribution and logistics, such as goods management in production lines or warehouses and stores, automatic sorting of goods, automatic sorting of mail delivery and home delivery, or confirmation of sorting classification
  • distribution and logistics such as goods management in production lines or warehouses and stores, automatic sorting of goods, automatic sorting of mail delivery and home delivery, or confirmation of sorting classification
  • an object of the present invention is to provide a technique capable of extending a communication range and expanding a use range in an RFID antenna.
  • the antenna according to the present invention has a shape in which a dipole antenna, which is a first antenna, is combined with a second antenna having an angle other than parallel or perpendicular.
  • the first antenna and the second antenna combined may be insulated or integrated.
  • a dipole antenna which is the first antenna, is combined with a second antenna that is not parallel or at a right angle but a third antenna that is parallel to the first antenna.
  • the first antenna, the second antenna, and the third antenna that are combined may be all insulated or may be partly or entirely integrated.
  • a dipole antenna which is the first antenna, has a second antenna that is not parallel or at a right angle, a third antenna that is parallel to the first antenna, and the first antenna.
  • the fourth antenna is combined with the third antenna as viewed from the antenna.
  • the first antenna and the second antenna combined may be insulated or may be integrated.
  • the first antenna that is a loop antenna and the second antenna that is not parallel or at a right angle but a certain angle are combined in a supply line on which RFID is mounted.
  • a signal is supplied by providing a supply line on which RFID is mounted inside the loop antenna, which is the first antenna.
  • the RFID inlet By providing the dipole antenna that constitutes the RFID inlet with the IC chip, a director and a reflector, and collecting the power of the circularly polarized electromagnetic wave from the interrogator into the dipole antenna, the RFID inlet It becomes possible to extend the communication distance.
  • FIG. 1 is a plan view showing the shape of a two-configuration antenna according to Embodiment 1 of the present invention.
  • FIG. 2 is a diagram showing a measurement result of a two-configuration antenna according to Embodiment 1 of the present invention.
  • FIG. 3 is a plan view showing the shape of a three-configuration antenna according to Embodiment 3 of the present invention.
  • FIG. 4 is a diagram showing a measurement result of a three-configuration antenna according to Embodiment 3 of the present invention.
  • FIG. 5 is a plan view showing the shape of a modified loop antenna according to a fourth embodiment of the present invention.
  • FIG. 6 is a diagram showing a measurement result of a modified loop antenna according to the fourth embodiment of the present invention.
  • FIG. 7 is a plan view showing the shape of a supply antenna in a loop antenna according to a fifth embodiment of the present invention.
  • Fig. 8 is a diagram showing a measurement result of a supply antenna in a loop antenna according to the fifth embodiment of the present invention.
  • 9 A diagram showing a basic configuration of an RFID system to which an antenna according to the present invention is applied.
  • FIG. 10 is a perspective view showing an antenna configuration of the article management system disclosed in Patent Document 1.
  • FIG. 11] (1) to (5) are diagrams showing a manufacturing method of a two-configuration antenna having an insulating structure in the first embodiment of the present invention.
  • FIG. 12] (1) to (3) are diagrams showing a method for manufacturing an integral two-component antenna in the first embodiment of the present invention.
  • FIG. 13 is a plan view showing the shape of a three-configuration antenna according to Embodiment 6 of the present invention.
  • FIG. 14 is a plan view showing the shape of a three-configuration antenna according to Embodiment 6 of the present invention.
  • FIG. 15 is a diagram showing a measurement result of a three-configuration antenna according to Embodiment 6 of the present invention.
  • FIG. 16 is a diagram showing a measurement result of a three-configuration antenna according to Embodiment 6 of the present invention.
  • FIG. 17 is a plan view showing the shape of a four-configuration antenna according to Embodiment 7 of the present invention.
  • FIG. 18 is a diagram showing a measurement result of a four-configuration antenna according to Embodiment 7 of the present invention.
  • FIG. 19 is a plan view showing the shape of a five-configuration antenna according to Embodiment 8 of the present invention.
  • FIG. 20 is a plan view showing the shape of a seven-configuration antenna according to Embodiment 9 of the present invention.
  • FIG. 21 is a plan view showing the shape of a two-configuration antenna according to Embodiment 2 of the present invention.
  • FIG. 22 is a plan view showing a configuration example of a wireless IC tag to which the antenna according to the present invention is applied.
  • FIG. 23 is a block diagram showing a circuit configuration example of an IC chip to which the antenna according to the present invention is applied.
  • FIG. 9 shows a basic configuration of a system using RFID to which the antenna according to the present invention is applied.
  • the system using RFID includes an interrogator 91, an antenna 92, and a wireless IC tag (RFID inlet) 93 using a dipole antenna.
  • Questioner 91 These signals are transmitted as radio waves from the antenna 92 connected to the interrogator 91.
  • the signal transmitted from the antenna 92 is received by the antenna of the wireless IC tag 93 existing in the radio wave area.
  • the wireless IC tag 93 detects the received signal and charges the capacitor or stray capacitance to operate the RFID internal circuit as an internal power source, and the HD information written therein is transmitted as a radio wave.
  • the signal transmitted from the wireless IC tag 93 is received by the antenna 92 of the interrogator 91, and the ⁇ 3 information is demodulated.
  • the wireless IC tag 93 includes, for example, an IC chip and an antenna.
  • FIG. 22 shows a configuration example of a wireless IC tag to which the antenna according to the present invention is applied.
  • the wireless IC tag (RFID inlet) 93 shown in FIG. 22 includes an upper substrate 212, an upper electrode (not shown), a first conductor 214, an IC chip 11, a lower electrode (not shown), and a second conductor 218.
  • the first conductor 214 is rectangular and the second conductor 218 has a slit 222 force S in the rectangle.
  • the slit 222 is for matching the impedance between the IC chip 11 and the antenna 12, and by adjusting the length of the slit, the length of the signal extraction line 213 can be changed to match the impedance.
  • a first conductor 214 is attached to the upper substrate 212, and a second conductor 218 is attached to the lower substrate 219.
  • An IC chip 11 having an upper electrode and a lower electrode is sandwiched between the first conductor 214 and the second conductor 218.
  • one of the upper surface electrode and the lower surface electrode of the IC chip 11 is connected to the signal extraction line 213, and the other is connected to the central portion of the dipole antenna 12.
  • the central part of the dipole antenna 12 is the minimum part of the excitation voltage, and both open ends are the maximum part of the excitation voltage.
  • the first conductor 214 and the second conductor 218 are electrically connected by a conductor connecting part 220.
  • the dipole antenna 12 is configured on the right and left sides of the second conductor 218.
  • FIG. 23 shows a circuit configuration example of an IC chip to which the antenna according to the present invention is applied.
  • the IC chip 11 includes, for example, a rectifier circuit 253, a capacitor 254, a clock circuit 255, a power-on reset circuit 257, a memory circuit 256, terminals 251 and 252, and the like.
  • the rectifier circuit 253 generates a power supply voltage from the carrier wave signal.
  • the modulation circuit (not shown) performs the uplink communication by changing the antenna impedance.
  • the power-on reset circuit 257 detects whether or not the clock from the interrogator 91 is supplied. It cancels the reset of the road.
  • the clock circuit 255 demodulates the clock signal from the envelope signal of the received signal and extracts a command superimposed on the carrier wave.
  • the memory circuit is composed of a counter, a decoder, a memory cell having ro information, a write circuit, and the like, and sends ro information in synchronization with a clock signal. ro information consists of identification information (unique data), EDC (error detection code) data, and so on.
  • the terminals 251 and 252 are connected to either the upper surface electrode or the lower surface electrode of the IC chip 11 described above. Therefore, the dipole antenna 12 is connected to the IC chip 11.
  • the electromagnetic wave (carrier wave signal) input from the dipole antenna 12 is rectified in the rectifier circuit 253 to generate a DC voltage. This voltage causes charge to accumulate in capacitor 254.
  • These digital circuits operate in synchronization with the clock signal, change the antenna impedance by a modulation circuit (not shown), transmit the I information stored in the memory cell to the interrogator 91, and perform upstream communication. I do.
  • the clock signal is generated by demodulating the electromagnetic wave modulated signal by the clock circuit 255.
  • the modulation method an FSK method that modulates at a power frequency, assuming an ASK method that modulates by amplitude, and a PSK method that modulates by phase are also applicable. A combination of these is also possible. That is, the wireless IC tag 93 to which the antenna according to the present invention is applied is a so-called passive IC tag, which rectifies electromagnetic waves (alternating current waves) to obtain power.
  • a conductor When a conductor is placed in an electromagnetic field, a current is induced and radiation is performed without direct power supply. This is called a parasitic element and is practically used as a director or a reflector.
  • the director arranges a conductor shorter than a half wavelength of the communication carrier frequency, and a current delayed in phase is excited in this conductor, and the current discharged from this conductor is in phase with the initial current.
  • the reflector also has a conductor that is longer than half the wavelength of the communication carrier frequency. A current with a phase lag is excited in this conductor, and the current emitted from this conductor is in reverse phase to the initial current.
  • a Yagi antenna that applies this principle.
  • a wave director is placed in front of the feed section and a reflector is placed behind it.
  • This uses linearly polarized waves, and the reception sensitivity is further increased by strengthening the electromagnetic wave coming from the front with a director and returning the excessive radio wave to the power feeding unit with a reflector.
  • the directivity of this Yagi antenna is comparable to that of reflectors and directors. It becomes the horizontal direction of the solid direction.
  • the length of the director of Yagi antenna is slightly shorter than ⁇ / 2
  • the length of the reflector is slightly longer than ⁇ / 2.
  • the antenna of the present invention utilizes circular polarization.
  • Circular polarization is called circular polarization because when two orthogonal antennas are fed with a phase difference of 90 degrees, both electromagnetic waves and electric fields change with time, and the trajectory of the magnitude of the electric field becomes a circle. It is.
  • a dipole antenna 12 that forms an RFID inlet together with the IC chip 11 a director and a reflector are provided to collect the electric power of the circularly polarized electromagnetic wave from the interrogator 92 to the dipole antenna.
  • the voltage after the rectifier circuit of the IC chip 11 is less than the voltage at which the internal circuit operates, so communication with the interrogator is impossible.
  • the antenna of the present invention has a directivity in the direction perpendicular to the direction in which the reflector and the director are arranged by using the circularly polarized wave with the arrangement of the director and the reflector.
  • a director emits an electromagnetic wave with the same phase as an incident electromagnetic wave, and a reflector emits an electromagnetic wave with an opposite phase to the incident electromagnetic wave.
  • FIG. 1 is a plan view showing the shape of a two-configuration antenna according to the first embodiment of the present invention
  • FIG. 2 is a diagram showing the measurement results of the two-configuration antenna according to the first embodiment.
  • the two-configuration antenna 1 of the first embodiment is, for example, an RFI D antenna that transmits and receives circularly polarized radio waves, and includes a dipole antenna (first antenna) 12 and an antenna (second antenna) 13. Etc.
  • a two-configuration antenna 1 has a shape in which an antenna 13 is arranged at an angle not parallel or perpendicular to a dipole antenna 12 connected to an IC chip 11 and resonating with a communication carrier frequency.
  • the angle between the antenna 13 and the dipole antenna 12 is an angle at which the dipole antenna 12 can easily receive the radio wave radiated from the antenna 13 by the radio wave from the interrogator.
  • the communication distance is slightly reduced. This is because the current induced in the antenna 13 leaks to the dipole antenna side by adopting a one-piece structure, and thus a loss occurs in the radiated radio wave.
  • the dipole antenna 12 and the antenna 13 are formed by means such as vapor deposition or printing on the epoxy resin composition film 15 or the substrate surface. Alternatively, it may be formed on the surface of a thin-film medium such as paper cellophane or a flat medium such as a card. Further, it may be embedded in a thin film medium or a card medium. As described above, since the waveguide and the reflector are provided on the surface of the thin film medium or the flat medium, or on the same plane or substantially on the same plane, the wireless IC tag does not increase in the three-dimensional direction. , It should only grow in two dimensions. Therefore, it is suitable for inventory management, inspection management, etc., when wireless IC tags are labeled and attached to articles.
  • the antenna 13 serves as a director.
  • the antenna of the present invention uses circularly polarized waves.
  • circularly polarized waves When circularly polarized waves are fed with two orthogonal antennas with a phase difference of 90 degrees, both electromagnetic waves and electric fields change with time. Since the trajectory is a circle, it is called circular polarization.
  • the circularly polarized signal 14 transmitted from the interrogator antenna is amplified together with the radiation of the antenna 13, and the amplified signal wave 14a is emitted in the same phase. Therefore, since the signal wave from the antenna 92 of the interrogator 91 and the emitted signal 14a are received by the dipole antenna 12, the operating power of the IC chip 11 is increased and the communication distance is improved.
  • the length (L) of the dipole antenna 12 is preferably in the range of from / 2 to ⁇ / 3, if the wavelength of the communication carrier wave is selected.
  • the length (L) of the antenna 13 is in the range from / 2 to ⁇ / 4.
  • the length (L) of the dipole antenna 12 is less than the shortening rate due to the influence of the dielectric constant of the film.
  • the combined angle ( ⁇ ) of the dipole antenna 12 and the antenna 13 is preferably in the range of 45 to 85 degrees and around 80 degrees.
  • the basis for these numbers is explained using Figure 2.
  • FIG. 2 shows the measurement results when the 2.45 GHz frequency band of the dual antenna 1 according to Embodiment 1 is used.
  • the interrogator used was 300 mW at a frequency band of 2.45 GHz, and the antenna was a 14-dBi 4-patch antenna. This is a measurement result of a two-component antenna in a configuration in which the dipole antenna 12 and the antenna 13 are insulated.
  • the communication distance 26 represents the distance from the interrogator antenna to the wireless IC tag (two-component antenna 1), and the unit is cm (centimeter).
  • Angle 27 indicates the angle ( ⁇ ) between the dipole antenna 12 and the antenna 13, which is 90 degrees, 80 degrees, 70 degrees, 60 degrees, 50 degrees, and 40 degrees from the left.
  • the unit characteristic 21 shows the result of measuring the dipole antenna 12 alone.
  • the distance between the interrogator and the dipole antenna 12 is gradually increased while communicating, and the longest point that can be communicated is obtained. From the scale of communication distance 26, it can be seen that the performance of the dipole antenna 12 alone is 68 cm.
  • Antenna length 50 mm (millimeters) Characteristic 22 indicates that the length (L) of the antenna 13 is ⁇ / 2.
  • the point of angle ( ⁇ ) 3 ⁇ 40 degrees is 98cm
  • the separation is falling.
  • the length (L) of the antenna 13 is changed from 45 mm ( ⁇ / 2.7) to 40 mm (/
  • the combined angle ( ⁇ ) of the dipole antenna 12 and the antenna 13 is around 80 degrees.
  • FIG. 11 shows a manufacturing method of the two-configuration antenna 1 when the dipole antenna 12 and the antenna 13 are insulated.
  • the two-configuration antenna 1 is manufactured in the following order of steps (1) to (5).
  • the dipole antenna 12 is vapor-deposited on the film 15.
  • Dipole antenna 12 IC chip 11 is connected to.
  • the insulating film 17 is applied to the antenna 13 to complete. In this method, the manufacturing cost increases due to the increased number of processes. When manufacturing at a low cost, the communication distance is slightly reduced, but it is desirable to have an integral structure.
  • FIG. 12 shows a manufacturing method of the two-configuration antenna 1 when the dipole antenna 12 and the antenna 13 are manufactured in an integral structure.
  • the monolithic two-component antenna 1 is manufactured in the following order of steps (1) to (3).
  • a monolithic antenna 18 of the dipole antenna 12 and the antenna 13 is deposited on the film 15.
  • (2) Connect IC chip 11 to body structure antenna 18.
  • (3) The insulating film 19 is applied to the body structure antenna 18 to complete.
  • FIG. 21 is a plan view showing the shape of a two-configuration antenna according to Embodiment 2 of the present invention.
  • the two-configuration antenna 108 of the second embodiment is, for example, an R FID antenna that transmits and receives circularly polarized radio waves, such as a dipole antenna (first antenna) 12, an antenna (second antenna) 114, and the like. It is composed of FIG. 21 shows a shape in which an antenna 114 is arranged on the right side of the dipole antenna 12. The antenna 114 can be arranged on the left side of the dipole antenna 12.
  • FIG. 21 shows a shape in which an antenna 114 is arranged on the right side of the dipole antenna 12.
  • the antenna 114 can be arranged on the left side of the dipole antenna 12.
  • a circularly polarized signal 117 transmitted from the interrogator antenna induces a current in the antenna 114 and a signal wave 117a is emitted from the antenna 114 in an opposite phase. Therefore, the circularly polarized signal 116 and the emitted signal 117a are received by the dipole antenna 12, which increases the operating power and improves the communication distance.
  • the antenna 114 as a reflector in parallel or substantially in balance with the antenna 12, the communication distance can be extended with a small number and a small area.
  • FIG. 3 is a plan view showing the shape of a three-configuration antenna according to the third embodiment of the present invention
  • FIG. 4 is a diagram showing the measurement results of the three-configuration antenna according to the third embodiment.
  • the three-configuration antenna 3 of Embodiment 3 is, for example, an RFI D antenna that transmits and receives circularly polarized radio waves.
  • a dipole antenna (first antenna) 12 and an antenna (second antenna) 13 are used.
  • the three-configuration antenna 3 is configured such that an antenna 13 is arranged at an angle not parallel or perpendicular to a dipole antenna 12 connected to an IC chip 11 and resonating with a communication carrier frequency.
  • This is a shape composed of parallel antennas 31 parallel to 12.
  • the antenna 31 serves as the reflector described above. However, at this position, the phase of the radiated radio wave does not completely match the phase of the radio wave from the interrogator, but it is used when it is desired to reduce the overall tag size. If the overall size of the tag may be large, the performance can be further improved by arranging the parallel antenna 31 at a different position. This will be described later.
  • FIG. 3 a current is induced in the antennas 13 and 31 by the circularly polarized signal transmitted from the antenna on the interrogator side, and the signal waves from the antenna 13 and the antenna 13 have the same phase, and the antenna 3 1 Force signal wave 32a is emitted in antiphase. Therefore, the signal wave from the antenna 92 of the interrogator 91 and the signal wave emitted from the antennas 13 and 31 are received by the dipole antenna 12, which increases the operating power and improves the communication distance.
  • the dipole antenna 12, the antenna 13, and the parallel antenna 31 may be insulated or partially integrated.
  • a partially integrated structure means a dipole.
  • the manufacturing method of the three-component antenna 3 is the same as the two-component antenna according to the first embodiment, in which a dipole antenna 12 is vapor-deposited on a substrate or a film and an insulating film is applied. Then, the antenna 13 is vapor-deposited, and then an insulating film is applied, and then the parallel antenna 31 is vapor-deposited.
  • the manufacturing unit price increases. Therefore, if you want to manufacture at a low cost, the communication distance will be slightly reduced, but it is desirable to have an integrated structure.
  • the dipole antenna 12 and the antenna 13, or the antenna 13 and the parallel antenna 31 are combined, or the dipole antenna 12, the antenna 13 and the parallel antenna 31 are combined. On the substrate or film Vapor deposition may be performed.
  • the length of the dipole antenna 12 (or, in the range of / 2 to ⁇ / 3, preferably around ⁇ / 2 ⁇ 3. This is produced by evaporating the dipole antenna on a film. Therefore, when an epoxy resin composition film with a dielectric constant of 1.96 is adopted, it is determined from the shortening rate due to the influence of the dielectric constant of the film;
  • the length (L) of the antenna 13 is preferably from / 2/2; ⁇ ⁇ 4, and is preferably around ⁇ / 2.
  • the combined angle ( ⁇ ) of the dipole antenna 12 and the antenna 13 is preferably in the range of 55 to 85 degrees and around 80 degrees.
  • the three-component antenna of the third embodiment is a combination of the two-component antenna and the parallel antenna 31.
  • the length (L) of the parallel antenna 31 is in the range of ⁇ / 2 to 3
  • FIG. 4 shows the measurement results when the 2.45 GHz frequency band of the three-configuration antenna 3 of the third embodiment is used.
  • This is a measurement result of a three-configuration antenna in a configuration in which dipole antenna 12, antenna 13, and parallel antenna 31 are insulated.
  • Communication distance 26 represents the distance from the antenna on the interrogator side to the wireless IC tag (3-element antenna 3), and the unit is cm.
  • the unit characteristic 21 shows the measurement result of the dipole antenna 12 alone. From the scale of communication distance 26, the performance of the dipole antenna 12 alone is 68cm.
  • the double antenna characteristic 41 shows the optimum value for the dual antenna described in Fig. 2, and is 98 cm from the scale of the communication distance 26.
  • a position (Dx) 45 indicates a lateral distance between the dipole antenna 12 and the parallel antenna 31.
  • a vertical position (Dy) 46 indicates a vertical distance between the dipole antenna 12 and the parallel antenna 31.
  • the parallel antenna 50mm characteristic 42 indicates that the length (L) of the parallel antenna 31 is
  • the measurement result at 50 mm is shown. From this measurement result, the position of the parallel antenna 31 is more than the dipole antenna 12 in the lateral direction (Dx) force S30mm and 40mm, and the vertical position (Dy). The communication distance at the position of force 3 ⁇ 40mm is 104cm.
  • the parallel antenna 45 mm characteristic 43 shows the measurement result when the length (L) of the parallel antenna 31 is 45 mm. This measurement
  • the vertical position (Dy) is 30 mm.
  • a communication distance of about 1.5 times can be obtained compared to the case of the dipole antenna 12 alone.
  • FIG. 5 is a plan view showing the shape of the modified loop antenna according to the fourth embodiment of the present invention
  • FIG. 6 is a diagram showing the measurement results of the modified loop antenna according to the fourth embodiment.
  • the modified loop antenna 5 of the fourth embodiment is, for example, an RFID antenna that transmits and receives circularly polarized radio waves, and includes a loop antenna (first antenna) 51, an antenna (second antenna) 52, and a supply line. It consists of 53 etc.
  • a modified loop antenna 5 is a supply line 53 that connects a loop antenna 51 that resonates with a communication carrier frequency and an antenna 52 that is arranged at an angle that is not parallel or perpendicular to the IC chip 11. It has a connected shape.
  • the size of the loop antenna 51 is ⁇ / 6 in the horizontal (Lx) and / 4 in the vertical (Ly).
  • the length (L) of the antenna 52 is ⁇ / 2
  • the angle ( ⁇ ) between the supply line 53 and the antenna 52 should be in the range of 30 to 60 degrees, 35 degrees force 40 degrees, or 60 degrees.
  • FIG. 6 shows the measurement results of the modified loop antenna of the fourth embodiment. Communication distance
  • the unit characteristic 21 shows the result of measurement with the dipole antenna 12 alone, and the communication distance is 68 cm.
  • the angle ( ⁇ ) 62 is the supply line 53,
  • the angle of antenna 52 is shown, and a range of 30 to 60 degrees is measured. However, since the measurement data could not be obtained at the 30 degree position, the 35 degree position was measured and added. At this time, the loop antenna 51 and the antenna 52 overlap each other at a position of 30 degrees. From the measurement result 61 of this modified loop antenna, the angle ( ⁇ ) is about 35 to 40 degrees or 60 degrees.
  • the device has a communication distance of 94 cm, which is the best point.
  • FIG. 7 is a plan view showing the shape of the antenna supplied in the loop antenna according to the fifth embodiment of the present invention
  • FIG. 8 is a diagram showing the measurement result of the antenna supplied in the loop antenna according to the fifth embodiment.
  • the supply antenna 7 in the loop antenna according to the fifth embodiment is, for example, an RFID antenna that transmits and receives circularly polarized radio waves, and includes a loop antenna (first antenna) 51, a supply line 72, and the like. Yes.
  • the supply antenna 7 in the loop antenna has a shape in which a supply line 72 having the IC chip 11 attached is connected to the inside of the loop antenna 71.
  • the vertical length (Ly) is 60mm, which is / 2 and the force S is fixed, and the horizontal length (Lx) is in the range from / 6 to ⁇ / 3.
  • the feed line position (L) 73 was adjusted to 20 mm.
  • Supply line position (L) 73 ranges from ⁇ /2.4 to ⁇ / 3, eg 2.45 GHz
  • FIG. 8 shows a measurement result when the 2.45 GHz frequency band of the antenna supplied in the loop antenna of the fifth embodiment is used.
  • Communication distance 26 represents the distance from the interrogator antenna to the wireless IC tag (supplied antenna 7 in the loop antenna), and its unit is cm.
  • the unit characteristic 21 shows the result of measurement with the dipole antenna 12 alone, and the communication distance is 68 cm.
  • the supply line position 82 indicates the measured position of the supply line position (L) 73 shown in FIG. Measurement antenna measurement in loop antenna
  • FIGS. 15 and 16 are diagrams showing the measurement results of the three-configuration antenna according to Embodiment 6.
  • FIG. 1 The three-configuration antenna 101 and the three-configuration antenna 102 of the sixth embodiment are, for example, RFID antennas that transmit and receive circularly polarized radio waves.
  • the triple antenna 101 and the triple antenna 102 are connected to the dipole antenna 12 connected to the IC chip 11 and resonating with the communication carrier frequency at an angle that is not parallel or perpendicular.
  • the antenna 114 is parallel or substantially parallel to the dipole antenna 12.
  • the angle between the antenna 13 and the dipole antenna 12 is an angle at which the dipole antenna 12 easily receives the radio wave radiated from the antenna 13 by the radio wave from the interrogator.
  • the positions of the antenna 14 and the dipole antenna 12 are positions where the dipole antenna 12 can easily receive the radio waves radiated from the antenna 14 due to the radio waves from the interrogator. At this time, the dipole antenna 12 and the antenna 13 may be isolated or may be integrated.
  • FIG. 13 shows a shape in which the antenna 114 is arranged on the right side of the dipole antenna 12
  • FIG. 14 shows a shape in which the antenna 114 is arranged on the left side of the dipole antenna 12. Except for the presence of the antenna 114, it is the same as the embodiment of FIG. 1, and therefore, detailed description of the dipole antenna 12, the antenna 13, etc. is omitted.
  • a current is induced in the antenna 13 by the circularly polarized signal wave 116 transmitted from the interrogator-side antenna, and the signal wave 116 a is emitted from the antenna 13 in the same phase.
  • the circularly polarized signal 117 transmitted from the interrogator antenna induces a current in the antenna 114, and the antenna 114 emits the signal wave 117a in the opposite phase.
  • a circularly polarized signal 116 The emitted signals 116a and 117a are received by the dipole antenna 12, so that the operating power is increased and the communication distance is improved.
  • a current is induced in the antenna 13 by the circularly polarized signal wave 116 transmitted from the interrogator-side antenna, and the signal wave 116 a is emitted from the antenna 13 in the same phase.
  • the circularly polarized signal 118 transmitted from the interrogator antenna induces a current in the antenna 114, and the signal wave 118a is emitted from the antenna 114 in the opposite phase. Therefore, the circularly polarized signal 116 and the emitted signals 116a and 118a are received by the dipole antenna 12, which increases the operating power and improves the communication distance.
  • the length (L) of the antenna 114 is ⁇
  • the length (L) of the antenna 114 when using the 2.45 GHz frequency band is 60 mm.
  • the horizontal position (D) of the single antenna 12 and the antenna 114 is preferably about ⁇ / 1.75 in the range of ⁇ / 2 ⁇ 4 to E / 1.4. Thus, for example, it is 70 mm when using the 2.45 GHz frequency band.
  • FIG. 15 and FIG. 16 show the measurement results when the 2.45 GHz frequency band of the three-configuration antenna 101 and the three-configuration antenna 102 according to the sixth embodiment is used, and the dipole antenna 12 and the antenna 13 are connected. It is a measurement result in the insulated configuration.
  • FIG. 15 shows the measurement results when the antenna 114 is arranged on the right side of the dipole antenna 12
  • FIG. 16 shows the measurement results when the antenna 114 is arranged on the left side of the dipole antenna 12.
  • the communication distance 131 represents the distance from the interrogator antenna to the wireless IC tag (3-element antenna 101 or 3-element antenna 102), and its unit is cm.
  • the unit characteristic 132 shows the measurement result of the dipole antenna 12 alone. From the scale of communication distance 131, the performance of the dipole antenna 12 alone is 68cm.
  • the lateral position (D) 137 is the lateral distance between the dipole antenna 12 and the antenna 114.
  • the antenna length 55mm characteristic 133 indicates that the length (L) of the antenna 114 is 55mm.
  • the measurement result at the time is shown. From this measurement result, it can be seen that the communication distance at the position of 70 mm in the horizontal direction (D) and 80 mm from the dipole antenna 12 is 110c.
  • the measurement result at 3 m is shown. From this measurement result, the positions of 70 mm and 80 mm in the horizontal direction (D) are 116 cm, indicating the maximum value of the communication distance.
  • the antenna length 65mm characteristic 135 shows the measurement result when the length (L) of the antenna 114 is 65mm.
  • the lateral force (D) is 110 cm in position power of 70 mm.
  • the antenna length 55mm characteristic 133 indicates that the length (L) of the antenna 114 is 55mm.
  • the measurement result at the time is shown. From this measurement result, it can be seen that the communication distance at the position of D 114 (70 mm and 80 mm) is 110 c from the dipole antenna 12.
  • the measurement result at 3 m is shown. From this measurement result, the horizontal direction (D W3 ⁇ 40mm, 70mm and 80mm positions are 116cm, indicating the maximum communication distance.
  • the antenna length 65mm characteristic 135 indicates the length of the antenna 114 (L ) Is the measurement result when 65 mm
  • the lateral force (D) is 110 mm and the positional force is 110 cm.
  • a communication distance of about 1.7 times can be obtained compared to the case of the dipole antenna 12 alone.
  • FIG. 17 is a plan view showing the shape of a four-component antenna according to Embodiment 7 of the present invention
  • FIG. 18 is a diagram showing a measurement result of the four-component antenna according to Embodiment 7.
  • the four-configuration antenna 105 of the seventh embodiment has a configuration in which an antenna (fourth antenna) 115 is added to the configuration described in the sixth embodiment. Since the antenna 115 is the same as the embodiment of FIG. 13 except that the antenna 115 is present, the detailed description of the dipole antenna 12, the antenna 13, the antenna 114, and the like is omitted.
  • four-configuration antenna 105 is connected to IC chip 11 and is connected to communication carrier frequency.
  • a dipole antenna 12 that resonates in number, an antenna 13 at an angle that is not parallel or perpendicular, an antenna 114 that is parallel or substantially parallel to the dipole antenna 12, and an antenna that is parallel or substantially parallel to the dipole antenna 12 on the opposite side of the antenna 114
  • the shape is 115.
  • the dipole antenna 12 and the antenna 13 may be insulated or integrated.
  • FIG. 18 is a measurement result when using the 2.45 GHz frequency band of the four-configuration antenna 105 according to the seventh embodiment, and is a measurement result in a configuration in which the dipole antenna 12 and the antenna 13 are insulated.
  • the communication distance 131 represents the distance from the interrogator antenna to the wireless IC tag (four-component antenna 5), and its unit is cm.
  • the unit characteristic 132 shows the measurement result of the dipole antenna 12 alone.
  • the scale of the communication distance 131 and the performance of the dipole antenna 12 alone are 68 cm.
  • the lateral position (D) 162 includes the dipole antenna 12, the antenna 114, and the antenna 115.
  • the antenna length 60 mm characteristic 161 shows the measurement result when the length (L) of the antenna 114 is 60 mm. From this measurement result, the lateral position (D) is 70
  • Positional force from 1 mm to 80 mm is 164 cm, indicating the highest communication distance.
  • a communication distance of about 2.4 times can be obtained compared to the case of the dipole antenna 12 alone.
  • An antenna 13a of length (L) is provided as a director in parallel or substantially parallel to the opposite side
  • a circularly polarized signal transmitted from the antenna on the interrogator side induces a current in each of antennas 13, 13a, 114, and 115, and signal waves are emitted from antennas 13 and 13a in the same phase.
  • the signal wave is emitted in reverse phase. Therefore, since the signal from the interrogator and the signal emitted from the antennas 13, 13a, 114, and 115 are received by the dipole antenna 12, the operating power of the IC chip 11 is increased and the communication distance is improved. .
  • antennas 119 and 119a having the same length (L) as the antennas 114 and 115 are parallel or substantially parallel to the antennas 13 and 13a as reflectors.
  • the communication distance can be further extended.
  • the length of the antenna 12 (L), the length of the antenna 13 (L), and the lengths of the antennas 114, 115, 1 19, and 119a (L), the length of the antenna 12 (L), the length of the antenna 13 (L), and the lengths of the antennas 114, 115, 1 19, and 119a (
  • the relationship with L) is preferably L ⁇ L ⁇ L.
  • a circularly polarized signal transmitted from the interrogator antenna causes a current to be induced in each of the antennas 13, 13a, 114, 115, 119, and 119a, and signal waves are emitted from the antennas 13 and 13a in the same phase.
  • Signal waves are emitted from the antennas 114, 115, 119, and 119a in opposite phases. Therefore, a current was induced in antennas 13 and 13a by the signal from the interrogator, the signals emitted from antennas 13, 13a, 114, and 115, and the signals emitted from 119 and 119a, and emitted in the same phase. Since the signal is received by the dipole antenna 12, the operating power of the IC chip 11 is increased and the communication distance is improved.
  • the configuration in Fig. 20 consists of interrogator ⁇ dipole antenna 12, interrogator ⁇ director 13 ⁇ dipole antenna 12, interrogator ⁇ director 1 3a ⁇ dipole antenna 12, interrogator ⁇ reflector 114 ⁇ dipole antenna. 12, interrogator ⁇ reflector 115 ⁇ dipole antenna 12, interrogator ⁇ reflector 119 ⁇ director 13 & ⁇ dipole antenna 12, interrogator ⁇ reflector 119a ⁇ director 13 ⁇ dipole antenna 12 and so on Each antenna is placed at a position where all phases of the radio wave reaching the dipole antenna 12 are in phase.
  • FIG. 20 consists of interrogator ⁇ dipole antenna 12, interrogator ⁇ director 13 ⁇ dipole antenna 12, interrogator ⁇ director 1 3a ⁇ dipole antenna 12, interrogator ⁇ reflector 114 ⁇ dipole antenna. 12, interrogator ⁇ reflector 115 ⁇ dipole antenna 12, interrogator ⁇ reflector 119 ⁇ director 13 & ⁇ dipole antenna 12, interrogator ⁇ reflector 119a
  • the antennas according to the second to ninth embodiments of the present invention are manufactured by vapor deposition, printing, etc. of a metal on a substrate or an epoxy resin composition film as in the first embodiment (FIG. 11, see Figure 12.
  • the operation in the case where the rotation direction of the circularly polarized wave transmitted from the interrogator-side antenna is the right rotation has been described, but in the case of the left rotation, the antenna is turned over.
  • the dipole antenna 112 so as to be symmetrical with respect to the long axis direction, the same function is achieved. Therefore, when adopting the antenna of the present invention, prepare two types of tags, face up and inside out, and decide which one to use depending on the rotation direction of the circular polarization of the interrogator used. .
  • the material of the dipole antenna 12 and the antennas 13, 13a, 114, 115, 119, and 119a is not specified, but can be realized by a conductor such as aluminum or copper. Also, in the above-described embodiment of the shape, it is described as a linear rectangle, but the present invention is not limited to this.
  • Antenna 12 is a dipole antenna, antennas 13 and 13a are directors, and antennas 114, 115, 119, and 119a are If it has a shape that works as a reflector, it will be fine.
  • the antennas 13 and 13a, 114 and 115, 119 and 119a are point-symmetrical or substantially point-symmetrical or line-symmetrical or substantially line-symmetrical with respect to the central portion of the dipole antenna 12.
  • the antennas 13 and 13a are not limited to this, but the antennas 13 and 13a may operate as a director, and the antennas 114, 115, 119, and 119a operate as a reflector.
  • the force described for RFID is not limited to this, and the present invention can be applied to antennas of other communication systems.
  • a system using RFID to which an antenna according to the present invention is applied has a simple configuration.
  • distribution / distribution such as goods management, automatic sorting of goods, automatic sorting of mail delivery and home delivery, etc. Applications are being studied.

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Abstract

L'invention concerne une technique destinée à agrandir la portée d'utilisation d'une antenne destinée à un identificateur RFID en étendant la distance de communication de l'antenne. Une antenne (1) à deux éléments est constituée en plaçant une antenne (13) en parallèle à une antenne dipôle (12) ou à un angle autre qu'un angle droit par rapport à celle-ci, laquelle est reliée à une puce de circuit intégré (11) et résonne à la fréquence de la porteuse de communication. L'antenne dipôle (12) présente une longueur dans la plage allant de ?/2 à ?/3, de préférence ?/2,3 ou environ ?/2,3. L'antenne (13) présente une longueur dans la plage allant de ?/2 à ?/4, de préférence ?/2,8 ou environ ?/2,8. L'angle auquel sont combinées l'antenne dipôle (12) et l'antenne (13) se trouve dans la plage allant de 45° à 85°, de préférence 80° ou environ 80°.
PCT/JP2006/304052 2005-08-10 2006-03-03 Etiquette sans fil a circuit integre WO2007017967A1 (fr)

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JP2009049452A (ja) * 2007-08-13 2009-03-05 Toppan Forms Co Ltd アンテナ部材
KR101330363B1 (ko) 2010-09-17 2013-11-15 한국전자통신연구원 우편물 배송 서비스 측정을 위한 지향성 ｒｆｉｄ 라벨 태그

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Publication number Priority date Publication date Assignee Title
EP2251934B1 (fr) 2008-03-03 2018-05-02 Murata Manufacturing Co. Ltd. Dispositif à ci sans fil et système de communication sans fil
CN104567948B (zh) * 2015-01-19 2017-01-25 山西大学 一种采用无线射频技术识别的电阻型传感器

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JP2001345636A (ja) * 2000-06-06 2001-12-14 Ngk Insulators Ltd アンテナ装置
JP2005094474A (ja) * 2003-09-18 2005-04-07 Sharp Corp マルチタグ及びマルチタグを利用したｒｆｉｄシステム

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US6975834B1 (en) * 2000-10-03 2005-12-13 Mineral Lassen Llc Multi-band wireless communication device and method
JP2005134942A (ja) * 2003-10-28 2005-05-26 Mitsubishi Materials Corp Ｒｆｉｄリーダ／ライタ及びアンテナの構造

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2001345636A (ja) * 2000-06-06 2001-12-14 Ngk Insulators Ltd アンテナ装置
JP2005094474A (ja) * 2003-09-18 2005-04-07 Sharp Corp マルチタグ及びマルチタグを利用したｒｆｉｄシステム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009049452A (ja) * 2007-08-13 2009-03-05 Toppan Forms Co Ltd アンテナ部材
KR101330363B1 (ko) 2010-09-17 2013-11-15 한국전자통신연구원 우편물 배송 서비스 측정을 위한 지향성 ｒｆｉｄ 라벨 태그

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