WO2014111975A1

WO2014111975A1 - Antenna device

Info

Publication number: WO2014111975A1
Application number: PCT/JP2013/000243
Authority: WO
Inventors: 真介行本; 嶺斉藤
Original assignee: 三菱マテリアル株式会社
Priority date: 2013-01-18
Filing date: 2013-01-18
Publication date: 2014-07-24
Also published as: KR101970861B1; CN104854756A; CN104854756B; HK1209906A1; KR20150109363A

Abstract

Provided is an antenna device capable of flexible adjustment of each multi-resonant resonant frequency, and which can be miniaturized and made thin. The present invention is provided with an insulating substrate main body (2), ground surfaces (GND) which are each patterned with metal foil on the substrate main unit, a first element (3), and a second element (4). For the first element, a feeding point (FP) is provided on, and extends, a proximal end disposed on the ground surface side. Partway in the first element, an antenna element (AT) of a dielectric antenna is connected, and at a distal end, a first auxiliary antenna portion (6) is connected. The second element is connected to the proximal end side of the first element and extends the same, wherein a passive element (P2) is connected partway, and at a distal end, a second auxiliary antenna portion (7) is connected. The first auxiliary antenna portion and the second auxiliary antenna portion are formed with a flexible thin film conductor, are folded back, and above the substrate main body, extend from the substrate main body so as to be spaced apart from the same.

Description

Antenna device

The present invention relates to an antenna device capable of making multiple resonances.

2. Description of the Related Art Conventionally, in communication equipment, an antenna device using a radiation electrode and a dielectric block, an antenna device using a switch, and a control voltage source has been proposed to make the resonance frequency of the antenna double resonant. For example, as a conventional technique using a dielectric block, Patent Document 1 proposes a composite antenna that achieves high efficiency by forming a radiation electrode on a resin molded body and further integrating the dielectric block with an adhesive. . *

Further, as a conventional technique using a switch and a control voltage source, in Patent Document 2, a first radiation electrode, a second radiation electrode, a middle portion of the first radiation electrode, and a base end of the second radiation electrode are disclosed. An antenna device has been proposed that includes a switch interposed between the first radiation electrode and the second radiation electrode to electrically connect or disconnect the first radiation electrode.

JP 2010-81000 A JP 2010-166287 A

However, the following problems remain in the above-described conventional technology. That is, in the technique using the dielectric block as described in Patent Document 1, a dielectric block that excites the radiation electrode is used, and it is necessary to design the dielectric block, the radiation electrode pattern, etc. for each device. Depending on design conditions, antenna performance may be degraded, and unstable elements may increase. In addition, since the radiation electrode is formed on the surface of the resin molding, it is necessary to design the radiation electrode pattern on the resin molding. Depending on the communication equipment to be mounted and its application, the antenna design and mold design This is necessary and causes a significant increase in cost. Furthermore, since the dielectric block and the molded resin are integrated with an adhesive, the antenna performance may be degraded or unstable depending on the adhesive conditions (adhesive thickness, adhesive area, etc.) in addition to the adhesive Q value. There is a disadvantage that the number of elements increases. In addition, in the case of an antenna device using a switch and a control voltage source as described in Patent Document 2, a configuration of a control voltage source, a reactance circuit, and the like are required to switch the resonance frequency with the switch. However, there is a problem in that each device is complicated, there is no degree of freedom in design, and easy antenna adjustment is difficult. *

The present invention has been made in view of the above-mentioned problems, and can flexibly adjust each resonance frequency that has been double-resonated. It is an object of the present invention to provide an antenna device that can be thinned.

The present invention employs the following configuration in order to solve the above problems. That is, the antenna device of the first invention includes an insulating substrate body, a ground plane patterned with a metal foil on the substrate body, a first element, and a second element, and the first element includes: A feeding point is provided at the base end arranged on the ground plane side and extends, and the antenna element of the dielectric antenna is connected to the middle, the first auxiliary antenna part is connected to the tip, and the second element is The first auxiliary antenna unit and the second auxiliary antenna are connected to and extend from the base end side of the first element, a passive element is connected to the middle, and a second auxiliary antenna unit is connected to the tip. The portion is formed of a flexible thin film conductor, is folded back, and extends above the substrate main body with a space between the substrate main body and the substrate main body. *

In this antenna device, the first auxiliary antenna portion and the second auxiliary antenna portion are formed of a flexible thin film conductor and are folded back so as to be spaced above the substrate body. Since it extends, the stray capacitance generated between the first and second auxiliary antenna portions and the ground surface on the substrate body, the antenna element of the loading element that does not self-resonate at a desired resonance frequency, and each element is effectively reduced. By using it, it is possible to make double resonance. In addition, since the first auxiliary antenna portion and the second auxiliary antenna portion are formed of a flexible thin film conductor and are folded back, the interval between the first and second auxiliary antenna portions and the substrate body is appropriately set. Even when the gap between the installation locations is changed or when the first and second auxiliary antenna portions must be curved and arranged, the arrangement conditions of the housing to be mounted can be flexibly dealt with. In particular, the antenna elements and passive elements are not mounted on the first and second auxiliary antenna sections, and these are mounted only on the substrate body side, so that the flexibility of the first and second auxiliary antenna sections is sufficient. Can be secured. Also, by selecting the antenna element and each passive element, each resonance frequency and impedance can be adjusted flexibly, and an antenna device capable of two resonances according to the application, equipment, and design conditions can be obtained. Furthermore, it is possible to design with the extended shape of the first and second auxiliary antenna sections and each element in the plane of the board body, and it is thinner than when using conventional dielectric blocks, resin moldings, etc. In addition, selection of an antenna element that is a dielectric antenna enables miniaturization and high performance. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized. *

The antenna device according to a second aspect is characterized in that, in the first aspect, the first auxiliary antenna portion and the second auxiliary antenna portion are patterned with a metal foil on an insulating film. That is, in this antenna device, the first auxiliary antenna portion and the second auxiliary antenna portion are patterned with a metal foil on the insulating film, so that high flexibility can be obtained, and the insulating film By appropriately selecting a material having a high dielectric constant, the pattern shortening effect of the first and second auxiliary antenna portions can be obtained, and when a desired frequency band is low or further downsizing is required Will also be available. Furthermore, a general-purpose flexible printed circuit board can be used, and the cost can be reduced. *

An antenna device according to a third invention is characterized in that, in the first or second invention, open ends of the first auxiliary antenna portion and the second auxiliary antenna portion are arranged in opposite directions. And That is, in this antenna device, since the open ends of the first auxiliary antenna unit and the second auxiliary antenna unit are arranged in opposite directions to each other, the portions having high mutual impedance are opposite to each other, and the coupling is performed. In addition to being able to suppress, stray capacitance generated between each other can be effectively utilized. *

An antenna device according to a fourth aspect of the present invention is the antenna device according to any one of the first to third aspects, wherein the open end of the first auxiliary antenna portion is disposed in the opposite direction with respect to the open end of the antenna element. It is characterized by that. That is, in this antenna device, since the open end of the first auxiliary antenna portion is arranged in the opposite direction with respect to the open end of the antenna element, the portions having high mutual impedance are opposite to each other, and the coupling is performed. In addition to being able to suppress, stray capacitance generated between each other can be effectively utilized. *

The antenna device according to a fifth aspect of the present invention is the antenna device according to any one of the first to fourth aspects, wherein a spacer is provided between the first auxiliary antenna portion and the second auxiliary antenna portion and the substrate body. It is characterized by. That is, in this antenna device, since the spacer is installed between the first auxiliary antenna unit and the second auxiliary antenna unit and the substrate body, the first and second auxiliary antenna units are separated by the spacer set to a predetermined thickness. The distance from the substrate body can be kept constant. Moreover, the pattern shortening effect of the 1st, 2nd auxiliary antenna part is acquired by making the material of a spacer into a high dielectric material. Further, by adopting an elastic material such as rubber, it is possible to obtain an impact absorbing effect. *

The antenna device according to a sixth aspect of the present invention is the antenna device according to any one of the first to fifth aspects, wherein the substrate body is patterned with a metal foil and extends from the base end of the first element so that the tip is from the feeding point. A third element connected to the ground plane at a spaced position is provided, and the first element is provided with a feeding point at a proximal end disposed on the ground plane side and extends in a direction away from the ground plane. A first extension part; and a second extension part extending in a direction along the ground plane from a distal end of the first extension part, wherein the second element is a base end of the first element. A third extending portion extending in a direction away from the first extending portion, and a fourth extending portion extending in a direction away from the ground surface along the first extending portion from the tip of the third extending portion. The first auxiliary antenna unit A fifth extending portion extending from the tip of the second extending portion toward the upper side of the substrate body, and a second extending from the tip of the fifth extending portion along the second extending portion. A seventh extension portion extending from the tip of the fourth extension portion toward the upper side of the substrate body, and the seventh extension portion. And an eighth extending portion extending along the sixth extending portion, and the second extending portion is formed on the ground surface so as to generate a stray capacitance with the ground surface. On the other hand, the antenna element extends at a distance and the antenna element is provided in the middle. That is, in this antenna apparatus, the stray capacitance between the first extension part and the fourth extension part, the first auxiliary antenna part (mainly the sixth extension part), due to the arrangement of the extension parts, Stray capacitance between the seventh extension portion, stray capacitance between the first auxiliary antenna portion (mainly the sixth extension portion) and the eighth extension portion, and first auxiliary antenna portion (mainly the first extension portion). 6 extension portion) and the stray capacitance between the antenna element, the stray capacitance between the first auxiliary antenna portion (mainly the sixth extension portion) and the ground plane, and between the antenna element and the ground plane. Stray capacitance, stray capacitance between the seventh extension portion and the ground plane, and stray capacitance between the eighth extension portion and the ground plane can be generated.

The present invention has the following effects. That is, according to the antenna device of the present invention, the first auxiliary antenna portion and the second auxiliary antenna portion are formed of a flexible thin film conductor and folded, so that each element, antenna element, and passive element are Since it extends above the provided substrate body with a space between the substrate body, each resonance frequency can be flexibly adjusted, and two resonances can be achieved according to design conditions. , Downsizing and high performance are possible. Therefore, the antenna device of the present invention can easily achieve multiple resonances corresponding to various applications and devices, and can save space and improve the degree of freedom of wiring and installation.

In one Embodiment of the antenna apparatus which concerns on this invention, it is a top view of the principal part which shows the state (a) which expanded the 1st and 2nd auxiliary | assistant antenna part, and the folded state (b). In this embodiment, it is a side view of the principal part which shows an antenna device. In this embodiment, they are a perspective view (a), a plan view (b), a front view (c), and a bottom view (d) showing an antenna element. In this embodiment, it is a wiring diagram which shows the stray capacitance produced with an antenna apparatus. In the Example of the antenna apparatus which concerns on this invention, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) in 2 resonance. In the Example of the antenna apparatus which concerns on this invention, it is a graph which shows the radiation pattern of 900 MHz band. In the Example of the antenna device which concerns on this invention, it is a graph which shows the radiation pattern of 1800 MHz band. In the embodiment of the antenna device according to the present invention, a case where the spacer is curved and the thickness of the spacer is 6 mm (a), a case where the spacer is curved and the thickness of the spacer is 3 mm (b), and a vertically arranged spacer It is a side view of the principal part which shows an antenna device with (c) when the thickness of this is 6 mm. In the embodiment of the antenna device according to the present invention, the thickness of the spacer is 6 mm in the curved arrangement, the thickness of the spacer is 3 mm in the curved arrangement, and the thickness of the spacer is 6 mm in the vertical arrangement. It is a graph which shows the 1st and 2nd resonant frequency with a case. In the other example of this embodiment, it is a side view of the principal part at the time of fracture | rupturing the housing | casing which shows an antenna apparatus.

Hereinafter, an antenna device according to an embodiment of the present invention will be described with reference to FIGS. *

As shown in FIGS. 1 and 2, the antenna device 1 according to the present embodiment includes an insulating substrate body 2, a ground surface GND that is patterned on the substrate body 2 with a metal foil such as a copper foil, An element 3, a second element 4, and a third element 5 are provided. Note that a mounting area for RF circuit components and the like is provided on the ground plane GND. *

The first element 3 extends with a feeding point FP provided at the proximal end disposed on the ground plane GND side, and is connected to the antenna element AT and the first passive element P1 of the dielectric antenna in the middle. The 1st auxiliary antenna part 6 is connected to. The second element 4 is connected to the proximal end side of the first element 3 and extends, and the second passive element P2 is connected to the middle, and the second auxiliary antenna unit 7 is connected to the distal end. The third element 5 extends from the base end of the first element 3 and is connected to the ground plane GND at a position where the tip is separated from the feeding point FP. A third passive element P3 is connected in the middle of the third element 5. *

The first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are formed of a flexible thin film conductor and folded back as shown in FIG. 1B and FIG. It extends above the substrate body 2 with a gap. A spacer 8 is installed between the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 and the substrate body 2. *

The first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are formed by patterning the insulating film 9 with a metal foil such as a copper foil. In the present embodiment, a flexible printed circuit board is used in which a copper foil constituting the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 is provided between two layers of polyimide films constituting the insulating film 9. . In addition, although the 1st auxiliary antenna part 6 and the 2nd auxiliary antenna part 7 are connected to the 1st element 3 and the 2nd element 4 by soldering, you may employ | adopt another connection structure. *

The first element 3 includes a first extending portion E1 having a feeding point FP provided at a proximal end disposed on the ground surface GND side and extending in a direction away from the ground surface GND, and the first extending portion E1. And a second extending portion E2 extending in a direction along the ground surface GND (an end side of the opposing ground surface GND). The second element 4 includes a third extending portion E3 extending in a direction away from the first extending portion E1 from the base end of the first element 3, and a first extending portion from the distal end of the third extending portion E3. And a fourth extending portion E4 extending in a direction away from the ground surface GND along E1. *

The first auxiliary antenna portion 6 includes a fifth extending portion E5 extending from the tip of the second extending portion E2 toward the upper side of the substrate body 2, and a second extending from the tip of the fifth extending portion E5. And a sixth extending portion E6 extending along the existing portion E2. The second auxiliary antenna portion 7 includes a seventh extending portion E7 extending from the tip of the fourth extending portion E4 toward the upper side of the substrate body 2, and a sixth extending from the tip of the seventh extending portion E7. And an eighth extending portion E8 extending along the existing portion E6. *

The first and second

auxiliary antenna units

6 and 7 are both set wider in line width than the first element 3 and the second element 4. In particular, the sixth extending portion E6 and the seventh extending portion E7 are formed wide so that the antenna occupation area is increased and the stray capacitance generated between the antenna element AT and each element is effectively used. We are trying to increase the bandwidth. In addition, it is preferable to arrange the auxiliary antenna portion corresponding to the low resonance frequency on the inner side (side closer to the antenna element AT). That is, in the present embodiment, the first auxiliary antenna unit 6 corresponding to the first frequency f1 that is the low frequency band is located inside the second auxiliary antenna unit 7 corresponding to the second frequency f2 that is the high frequency band. Is arranged. As a result, the first auxiliary antenna unit 6 corresponding to the first frequency f1 which is a low frequency band can be brought close to the antenna element AT and away from the RF circuit component, the case, and the like installed on the ground plane GND. *

The second extending portion E2 extends at a distance from the ground surface GND so that stray capacitance between the second extending portion E2 and the ground surface GND can be generated, and the antenna element AT is provided in the middle. The third element 5 extends to the opposite side to the second element 4 with respect to the first extending portion E1, is bent in the middle, and is connected to the ground plane GND at a position separated from the first extending portion E1. Yes. *

The open ends of the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are arranged in opposite directions. The open end of the first auxiliary antenna portion 6 is arranged in the opposite direction with respect to the open end of the antenna element AT (the end portion on the front end side of the second extending portion E2). *

The substrate body 2 is a general printed circuit board, and in this embodiment, a printed circuit board body made of a rectangular glass epoxy resin or the like is employed. The feeding point FP is connected to a feeding point of a high-frequency circuit (not shown) through feeding means such as a coaxial cable. This power supply means includes various connectors such as a coaxial cable, a connector such as a receptacle, a connection structure in which the contact has a leaf spring shape, a connection structure in which the contact has a pin probe shape or a pin shape, and a connection structure using a soldering land. The structure can be adopted. For example, when a coaxial cable is employed as the power feeding means, the ground wire of the coaxial cable is connected to the base end side of the ground plane GND, and the core wire of the coaxial cable is connected to the feeding point FP. *

The antenna element AT is a loading element that does not self-resonate at a desired resonance frequency. For example, as shown in FIG. 3, the antenna element AT is a chip antenna in which a conductor pattern 102 such as Ag is formed on the surface of a dielectric 101 such as ceramics. is there. As the antenna element AT, elements having different lengths, widths, conductor patterns 102, and the like may be selected according to the setting of the resonance frequency or the like, or the same element may be selected. The first passive element P1 to the third passive element P3 are, for example, inductors, capacitors, or resistors. *

The first element 3, the second element 4, the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 can generate each stray capacitance between them and a stray capacitance between the ground plane GND, It extends at intervals. That is, as shown in FIG. 4, the stray capacitance Ca between the first extension part E1 and the fourth extension part E4, the first auxiliary antenna part 6 (mainly the sixth extension part E6), and the seventh The stray capacitance Cb between the extension portion E7, the stray capacitance Cc between the first auxiliary antenna portion 6 (mainly the sixth extension portion E6) and the eighth extension portion E8, and the first auxiliary antenna portion. 6 (mainly the sixth extending portion E6) and the stray capacitance Cd between the antenna element AT and the stray capacitance between the first auxiliary antenna portion 6 (mainly the sixth extending portion E6) and the ground plane GND. The capacitance Ce, the stray capacitance Cf between the antenna element AT and the ground plane GND, the stray capacitance Cg between the seventh extending portion E7 and the ground plane GND, and the eighth extending portion E8 and the ground plane GND. A stray capacitance Ch can be generated. *

The spacer 8 is a rectangular parallelepiped or a plate-like body formed of, for example, a resin such as ABS, and is installed with an insulating adhesive or a double-sided seal. The thickness of the spacer 8 and the installation position on the substrate body 2 are determined according to the space at the installation location of the antenna device 1, the mounting position of the antenna element AT, and the like. In the present embodiment, as shown in FIG. 2, the spacer 8 is located at a position spaced from the end side of the substrate body 2 and is disposed between the antenna element AT and the ground plane GND, and the first and second auxiliary The

antenna portions

6 and 7 are arranged in a curved manner when folded. The first and second

auxiliary antenna portions

6 and 7 are fixed to the upper surface of the spacer 8 with an adhesive, double-sided tape or the like via the insulating film 9. *

Next, the resonance frequency in the antenna device 1 of the present embodiment will be described with reference to FIG. *

In the antenna device 1 of the present embodiment, as shown in FIG. 5, two resonances are made, that is, a first resonance frequency f1 and a second resonance frequency f2. The first resonance frequency f1 is in a low frequency band (for example, 900 MHz band) of the two resonance frequencies, and the length of the antenna element AT, the first element 3, and the first auxiliary antenna unit 6, It is determined by the stray capacitances Ca to Cf. The second resonance frequency f2 is a high frequency band (for example, 1800 MHz band) of the two resonance frequencies, and the first element 3, the second element 4, and the second auxiliary antenna unit 7 It is determined by the length and stray capacitance Ca, Cb, Cc, Cg, Ch. *

Furthermore, the final adjustment of the first resonance frequency f1 can be flexibly adjusted using the first passive element P1. Further, the final adjustment of the second resonance frequency f2 can be flexibly adjusted using the second passive element P2. *

Further, the impedance at the first resonance frequency f1 is determined by each of the stray capacitances Ca to Cf. Also, the impedance at the second resonance frequency f2 is determined by the respective stray capacitances Ca, Cb, Cc, Cg, and Ch. Furthermore, the final impedance adjustment can be flexibly performed for each resonance frequency by using the third passive element P3. *

Therefore, the first resonance frequency f1 is adjusted mainly at the portion surrounded by the broken line A1 in FIG. Further, the second resonance frequency f2 is adjusted mainly at a portion surrounded by a broken line A2 in FIG. As described above, in the antenna operation, not only the antenna element AT and each of the passive elements P1 to P3 but also the stray capacitance between the elements, the stray capacitance between each element and the ground plane GND, and the first and second auxiliary antennas. By utilizing the stray capacitance between the

parts

6 and 7 and each element or the ground plane GND, it is possible to reduce the antenna occupation area. *

As described above, in the antenna device 1 according to the present embodiment, the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are formed of flexible thin film conductors and are folded back above the substrate body 2. Since the first and second

auxiliary antenna units

6 and 7 and the ground surface GND on the substrate body 2 and the loading element that does not self-resonate at a desired resonance frequency are provided. By effectively utilizing the stray capacitance generated between the antenna element AT and each element, multiple resonances can be achieved. *

Since the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are formed of a flexible thin film conductor and folded, the first and second

auxiliary antenna portions

6 and 7 and the substrate body 2 can be changed as appropriate, and even when the gap between the installation locations changes or when the first and second

auxiliary antenna portions

6 and 7 must be curved and arranged, the arrangement conditions of the housing to be mounted Can be handled flexibly. In particular, the first and second

auxiliary antenna sections

6 and 7 are not mounted with the antenna element AT or passive elements, but are mounted only on the substrate body 2 side, so that the first and second

auxiliary antenna sections

6 and 7 are mounted. 7 can be sufficiently secured. *

In addition, by selecting the antenna element AT and each of the passive elements P1 to P3, it is possible to flexibly adjust each resonance frequency and impedance, and to obtain an antenna device capable of making two resonances according to the application, equipment, and design conditions. it can. Furthermore, it is possible to design with the extended shape of the first and second

auxiliary antenna portions

6 and 7 and each element in the plane of the substrate body 2, and when using a conventional dielectric block or resin molded body, etc. In comparison with the reduction in thickness, selection of the antenna element AT which is a dielectric antenna enables reduction in size and performance. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized. *

Moreover, since the 1st auxiliary antenna part 6 and the 2nd auxiliary antenna part 7 are pattern-formed with the metal foil in the insulating film, while being able to obtain high flexibility, it is high as a material of an insulating film By appropriately selecting one having a dielectric constant, the pattern shortening effect of the first and second

auxiliary antenna units

6 and 7 can be obtained, and when a desired frequency band is low or further downsizing is desired. Will also be available. Furthermore, a general-purpose flexible printed circuit board can be used, and the cost can be reduced.

Alternatively, since the open ends of the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are arranged in opposite directions to each other, the portions having high mutual impedance are reversed to suppress the coupling. And stray capacitance generated between each other can be used effectively. Furthermore, since the open end of the first auxiliary antenna portion 6 is arranged in the opposite direction with respect to the open end of the antenna element AT, the portions having high impedance are opposite to each other, thereby suppressing coupling. And stray capacitance generated between each other can be used effectively. *

Further, since the spacer 8 is installed between the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 and the substrate body 2, the first and second auxiliary antenna units 6 are set by the spacer 8 set to a predetermined thickness. , 7 and the substrate body 2 can be kept constant. Moreover, the pattern shortening effect of the 1st and 2nd

auxiliary antenna parts

6 and 7 is acquired by making the material of the spacer 8 into a high dielectric material. Further, by adopting an elastic material such as rubber, it is possible to obtain an impact absorbing effect.

Next, in an example in which the antenna device of the present embodiment was actually manufactured, measurement was performed for the case where the VSWR characteristics (voltage standing wave ratio), the radiation pattern, and the spacer condition were changed in two resonances at each resonance frequency. The results will be described with reference to FIGS. *

Each passive element uses an inductor for each of the first passive element P1: 10 nH, the second passive element P2: 1.5 nH, and the third passive element P3: 10 nH. Moreover, the thickness of the spacer 8 was 6 mm. As shown in FIG. 5, in the embodiment of the present invention, the first resonance frequency f1: 927.13 MHz, VSWR: 1.17, bandwidth (VSWR ≦ 3): 82.9 MHz. Second resonance frequency f2: 1848.97 MHz, VSWR: 1.28, bandwidth (VSWR ≦ 3): 593.1 MHz. *

Regarding the measurement of the radiation pattern, the direction extending toward the ground plane GND in the extending direction of the first extending portion E1 is defined as the X direction, and the direction opposite to the extending direction of the second extending portion E2 is defined as the Y direction. The direction perpendicular to the surface of the substrate body 2 was taken as the Z direction. At this time, the vertical polarization, horizontal polarization and power gain with respect to the YZ plane were measured. *

FIG. 6 shows a radiation pattern (YZ plane) at the first resonance frequency f1 in the 900 MHz band, and the average power gain is 0.4 dBi. FIG. 7 shows a radiation pattern (YZ plane) at the second resonance frequency f2 in the 1800 MHz band, and the average power gain was −0.4 dBi. *

Next, the result of confirming the influence of the resonance frequency on the arrangement conditions of the first and second auxiliary antenna units is shown in FIG. Here, when the spacer 8 is curved and the thickness of the spacer 8 is 6 mm (FIG. 8A), when the spacer 8 is curved and the thickness of the spacer 8 is 3 mm (FIG. 8B), the vertical In the case where the spacer 8 is arranged to have a thickness of 6 mm ((c) in FIG. 8), changes in the first and second resonance frequencies f1 and f2 are measured and compared, respectively. The above-mentioned curved arrangement means that the first and second

auxiliary antenna portions

6 and 7 are temporarily installed upward along the upper surface of the spacer 8 after extending in an oblique direction upward from the substrate body 2. The vertical arrangement is a case where the first and second

auxiliary antenna portions

6 and 7 are once extended upward from the substrate body 2 in the vertical direction and then installed along the upper surface of the spacer 8. It is. *

Further, when the spacer 8 is vertically arranged and the thickness of the spacer 8 is 6 mm (FIG. 8C), the spacer 8 is installed near the edge of the substrate body 2 and on the right side of the antenna element AT in FIG. ing. As can be seen from this result, the resonance frequency for each arrangement is suppressed to a slight change of about ± 1% in both the 900/1800 MHz bands, and the frequency fluctuations associated with the arrangement of the first and second auxiliary antenna units. There are few, and it turns out that the correspondence for every apparatus to mount is easy. *

In addition, this invention is not limited to the said embodiment and Example, A various change can be added in the range which does not deviate from the meaning of this invention. *

For example, in the above embodiment, the antenna element is provided in the second extending portion, but the antenna element may be provided in the fourth extending portion. In this case, the length of the second element can be shortened by the antenna element of the fourth extending portion, which is suitable when the antenna occupation area is small. In addition, the stray capacitance Ca can be increased by employing an antenna element in the fourth extending portion. *

Furthermore, although it is preferable to provide a 1st and 2nd auxiliary | assistant antenna part using a flexible printed circuit board like the said embodiment, you may form with another flexible conductor thin film. For example, a thin glass epoxy substrate having flexibility may be used, and the first and second auxiliary antenna portions may be patterned on a metal foil such as a copper foil. *

Moreover, in the said embodiment, although the flexible printed circuit board which provided the 1st and 2nd auxiliary | assistant antenna part was attached on the spacer and installed in the board | substrate main body, as shown in FIG. A flexible printed circuit board provided with the first and second

auxiliary antenna portions

6 and 7 is affixed to the inner surface of the housing 20 of the communication device or the like in which the antenna device is built without using a spacer with an adhesive or a double-sided tape. Therefore, it may be installed so as to extend above the substrate body 2.

DESCRIPTION OF SYMBOLS 1 ... Antenna apparatus, 2 ... Board | substrate main body, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, 6 ... 1st auxiliary antenna part, 7 ... 2nd auxiliary antenna part, 8 ... Spacer, AT ... Antenna element, E1 ... 1st extension part, E2 ... 2nd extension part, E3 ... 3rd extension part, E4 ... 4th extension part, E5 ... 5th extension part, E6 ... 6th extension part , E7 ... seventh extension, E8 ... eighth extension, GND ... ground plane, P1 ... first passive element, P2 ... second passive element, P3 ... third passive element, FP ... feed point

Claims

An insulating substrate body, and a ground surface patterned with metal foil on the substrate body, a first element, and a second element are provided. The first element feeds power to a proximal end disposed on the ground surface side. A point is provided and extends, and the antenna element of the dielectric antenna is connected to the middle, the first auxiliary antenna part is connected to the tip, and the second element is connected to the base end side of the first element The second auxiliary antenna part is connected to the tip, and the first auxiliary antenna part and the second auxiliary antenna part are made of a flexible thin-film conductor. An antenna device, wherein the antenna device is formed and folded back and extends above the substrate body with a space between the substrate body.
The antenna device according to claim 1, wherein the first auxiliary antenna portion and the second auxiliary antenna portion are formed by patterning a metal foil on an insulating film.
The antenna device according to claim 1, wherein open ends of the first auxiliary antenna portion and the second auxiliary antenna portion are arranged in opposite directions.
4. The antenna device according to claim 1, wherein an open end of the first auxiliary antenna unit is disposed in a direction opposite to an open end of the antenna element. 5.
The antenna device according to claim 1, wherein a spacer is installed between the first auxiliary antenna unit and the second auxiliary antenna unit and the substrate body.
2. The antenna device according to claim 1, wherein the substrate body is patterned with a metal foil, and extends from a base end of the first element, and a tip is connected to the ground plane at a position separated from the feeding point. A first extending portion having a feeding point provided at a proximal end disposed on the ground surface side and extending in a direction away from the ground surface; and a first extending portion. A second extending portion extending in a direction along the ground surface from a distal end of the existing portion, and the second element extends from the base end of the first element in a direction away from the first extending portion. A third extension part; and a fourth extension part extending in a direction away from the ground surface along the first extension part from the tip of the third extension part, and the first auxiliary antenna part Of the second extension A fifth extending portion extending from the end toward the upper side of the substrate body; and a sixth extending portion extending from the tip of the fifth extending portion along the second extending portion. The second auxiliary antenna portion includes a seventh extension portion extending from the tip of the fourth extension portion toward the upper side of the substrate body, and the sixth extension from the tip of the seventh extension portion. And an eighth extending portion extending along the portion, and the second extending portion extends at a distance from the ground surface so as to generate a stray capacitance with the ground surface. The antenna device is characterized in that the antenna element is provided in the middle.