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WO2006134533A1 - Dispositif pour recevoir un signal de radiofrequence dans une bande de frequence - Google Patents

Dispositif pour recevoir un signal de radiofrequence dans une bande de frequence Download PDF

Info

Publication number
WO2006134533A1
WO2006134533A1 PCT/IB2006/051847 IB2006051847W WO2006134533A1 WO 2006134533 A1 WO2006134533 A1 WO 2006134533A1 IB 2006051847 W IB2006051847 W IB 2006051847W WO 2006134533 A1 WO2006134533 A1 WO 2006134533A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
circuit
coupled
coil
frequency band
Prior art date
Application number
PCT/IB2006/051847
Other languages
English (en)
Inventor
Anthony Kerselaers
Felix Elsen
Samuel Becque
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006134533A1 publication Critical patent/WO2006134533A1/fr

Links

Classifications

    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Definitions

  • the invention relates to a device comprising an antenna for receiving a radio frequency signal in a frequency band, and also relates to a circuit for use in a device, and to a system comprising a device and a further device.
  • Examples of such a device are wireless communication devices such as baby phones.
  • a prior art device is known from US 6,055,420, which discloses a device comprising a high Q antenna having a length and width each significantly less than a quarter wavelength within the predetermined frequency range.
  • a controllable reactive element in the form of a varactor is coupled to the antenna and has a variable reactance for tuning the antenna in a high Q resonant circuit to the frequency of a desired signal.
  • An antenna tuning circuit responsive to the frequency to which the antenna is tuned provides an antenna tuning signal to the varactor so that the antenna remains tuned.
  • the antenna and the varactor form a resonant circuit having a Q greater than 100.
  • the known device is disadvantageous, inter alia, owing to the fact that it is relatively complex and relatively expensive.
  • two amplifier stages, first and second varactors, a tuner for indirectly controlling the first varactor coupled to the antenna and for directly controlling the second varactor coupled to a local oscillator, and many feedback loops, one of them comprising a detector and a low pass filter, are necessary.
  • Further objects of the invention are, inter alia, to provide a circuit for use in a device and to provide a system comprising a device and a further device, with the device being relatively simple and relatively low cost.
  • the device according to the invention comprises an antenna for receiving a radio frequency signal in a frequency band, and a circuit for tuning the antenna to the frequency band and for, in response to a feedback signal, increasing an efficiency of a combination of the tuned antenna and the circuit.
  • a first function is a tuning function for tuning the antenna
  • a second function is an efficiency increasing function for, in response to a feedback signal, increasing an efficiency of the combination of the tuned antenna and the circuit.
  • the feedback signal as supplied to the varactor coupled to the antenna, has a tuning function only.
  • the frequency band may have a size such that it may comprise one frequency signal (or one frequency channel) or more frequency signals (or more frequency channels).
  • the invention is further advantageous, inter alia, in that the combination of the antenna and the circuit does not need to be a high Q combination, and in that the antenna can be a simple and low cost antenna of a size significantly smaller than a quarter wavelength of a center frequency of the frequency band, which allows the device according to the invention to be of a relatively small size too.
  • An embodiment of the device according to the invention is defined by the antenna being an electrical antenna having an electrical length of at most 20% of a wavelength of the frequency band.
  • the electrical antenna may have an electrical length of at most 20% of a wavelength of (a center frequency of) the frequency band, such as for example 1% to 5% of this wavelength. This allows the device according to the invention to be of an even smaller size.
  • US 3,824,473 discloses a radio receiver comprising a magnetic antenna in the form of a ferrite rod aerial coupled to a tuning capacitor. This tuning capacitor has a tuning function only and does not receive any feedback signal.
  • the radio receiver further comprises a transistor circuit comprising four transistors, one of them in a diode configuration, which transistor circuit is fed back to form a Q multiplier. So, in US 3,824,473, there is no circuit for tuning the antenna to the frequency band and for, in response to a feedback signal, increasing an efficiency of a combination of the tuned antenna and the circuit.
  • An embodiment of the device according to the invention is defined by the antenna being a non-loop antenna having a substantially omni directional radiation pattern. Such an antenna allows the device according to the invention to be used without an orientation of the device being of too much importance.
  • a substantially omni directional radiation pattern is a non-directional radiation pattern.
  • An embodiment of the device according to the invention is defined by further comprising - an amplifier for amplifying an antenna signal originating from the antenna via the circuit and for supplying the feedback signal to the circuit.
  • Such an amplifier for example comprises an input for receiving the antenna signal and a first output for supplying the feedback signal and a second output for supplying the amplified antenna signal and may be of the lowest complexity.
  • An embodiment of the device according to the invention is defined by a feedback between the amplifier and the circuit being a positive feedback, the amplifier being in a stable state. A positive feedback results from the feedback signal being fed back without a sign inversion taking place. To keep the amplifier in a stable state, in other words to prevent that the amplifier gets unstable and starts to oscillate, the amplification of the feedback loop should be smaller than one.
  • An embodiment of the device according to the invention is defined by the circuit comprising a coil, a first side of the coil being coupled to the antenna and a second side of the coil being coupled to ground.
  • the antenna comprises a capacitive antenna
  • the coil an inductor
  • a capacitor is to be used for tuning the antenna.
  • capacitive antennas are to be preferred.
  • An embodiment of the device according to the invention is defined by the circuit iurther comprising a further coil, a first side of the further coil being coupled to the amplifier and a second side of the further coil being coupled to ground, the coil and the further coil being inductively coupled coils.
  • the first side of the further coil forms the feedback input of the circuit.
  • An embodiment of the device according to the invention is defined by the circuit iurther comprising a first capacitor and a second capacitor, a first side of the first capacitor being coupled to the first side of the coil, a second side of the first capacitor being coupled to a first side of the second capacitor and to the amplifier, and a second side of the second capacitor being coupled to ground.
  • a common point of both capacitors forms the feedback input of the circuit.
  • An embodiment of the device according to the invention is defined by the amplifier comprising a transistor, a control electrode of the transistor being coupled to the first side of the coil, a first main electrode of the transistor being coupled via a first resistor to ground, and a second main electrode of the transistor being coupled via a second resistor to a voltage supply, the first main electrode supplying the feedback signal via a coupling capacitor, the second main electrode constituting an output of the amplifier.
  • This amplifier is of the lowest complexity.
  • the transistor has a high input impedance (FET,
  • the coupling capacitor provides more feedback at higher frequencies and less feedback at lower frequencies. This results in the increase of the efficiency of the combination of the antenna and the circuit being more constant over the frequency band.
  • An embodiment of the device according to the invention is defined by the circuit iurther comprising a capacitor coupled to the coil in parallel for reducing user-effects and/or surrounding-effects. This capacitor reduces user-effects and/or surrounding-effects.
  • Embodiments of the circuit according to the invention and of the system according to the invention correspond with the embodiments of the device according to the invention.
  • the invention is based upon an insight, inter alia, that high Q antennas and high Q resonant circuits are to be avoided when reducing complexities and costs, and is based upon a basic idea, inter alia, that a circuit is to be introduced for tuning the antenna to the frequency band and for, in response to a feedback signal, increasing an efficiency of a combination of the tuned antenna and the circuit.
  • the invention solves the problem, inter alia, to provide a relatively simple and relatively low cost device, and is further advantageous, inter alia, in that the combination of the antenna and the circuit does not need to be a high Q combination, and in that the antenna can be a simple and low cost antenna of a size significantly smaller than a quarter wavelength of a center frequency of the frequency band, which allows the device according to the invention to be of a relatively small size too.
  • Fig. 1 shows diagrammatically a system according to the invention comprising a device according to the invention with a circuit according to the invention
  • Fig. 2 shows diagrammatically a device according to the invention comprising a circuit according to the invention in greater detail
  • Fig. 3 shows diagrammatically a device according to the invention comprising a circuit according to the invention in greater detail
  • Fig. 4 shows a transfer response comprising a first curve without feedback and a second curve with feedback.
  • a system 100 according to the invention is shown diagrammatically.
  • the system 100 comprises a (receiving) device 10 according to the invention and a (transmitting) device 11.
  • the device 10 comprises a (receiving) antenna 1 coupled to a circuit 2 according to the invention.
  • the circuit 2 is coupled to an amplifier 3, which is coupled to a first module 4.
  • the device 11 comprises a (transmitting) antenna 5 coupled to a second module 6.
  • the second module 6 is coupled to a third module 7, which is coupled to a fourth module 8.
  • the device 10 for example comprises a (receiving) baby phone and the device 11 for example comprises a (transmitting) baby phone.
  • the first module 4 for example comprises a demodulator and an amplifier and a loudspeaker.
  • the second module 6 for example comprises a power amplifier, the third module 7 for example comprises a modulator and the fourth module 8 for example comprises a microphone.
  • the device 10 may in addition be provided with the respective modules 6', 7' and 8' all not shown and corresponding with the respective modules 6, 7 and 8, and the device 11 may in addition be provided with the respective modules 2', 3' and 4' all not shown and corresponding with the respective modules 2, 3 and 4.
  • the antennas 1 and 5 may each be used for receiving as well as for transmitting.
  • the respective devices 10 and 11 may in addition be provided with the respective antennas 5' and 1 ' both not shown and corresponding with the respective antennas 5 and 1.
  • a device 10 according to the invention is shown diagrammatically in greater detail.
  • the device 10 comprises the antenna 1 and the circuit 2 according to the invention and the amplifier 3.
  • the circuit 2 comprises a coil 21.
  • a first side of the coil 21 is coupled to the antenna 1 and a second side of the coil 21 is coupled to ground.
  • the circuit 2 further comprises a further coil 22.
  • a first side of the further coil 22 is coupled via a coupling capacitor 41 to the amplifier 3 and a second side of the further coil 22 is coupled to ground, such that the coils 21 and 22 form inductively coupled coils.
  • the first side of the coil 21 is further coupled via a further coupling capacitor 42 to the amplifier 3.
  • the amplifier 3 comprises a transistor 31.
  • a first main electrode (drain or source) of the transistor 31 is coupled via a first resistor 32 to ground and to the coupling capacitor 41.
  • a second main electrode (source or drain) of the transistor 31 is coupled via a second resistor 33 to a voltage supply and constitutes an output of the amplifier to be coupled to the first module 4.
  • a control electrode (gate) of the transistor 31 is coupled to the further coupling capacitor 42 and is coupled via a third resistor 43 to ground.
  • a capacitor 25 is coupled to the coil 21 in parallel.
  • the circuit 2 according to the invention has two functions.
  • a first function is a tuning function for tuning the antenna 1
  • a second function is an efficiency increasing function for, in response to a feedback signal originating from the first main electrode of the transistor 31, increasing an efficiency of the combination of the tuned antenna 1 and the circuit 2.
  • the device 10 according to the invention is a relatively simple and relatively low cost device.
  • the combination of the antenna 1 and the circuit 2 does not need to be a high Q combination, and the antenna 1 can be a simple and low cost antenna of a size significantly smaller than a quarter wavelength of a center frequency of the frequency band, which allows the device 10 according to the invention to be of a relatively small size too.
  • antennas that have a too short electrical length and that need to be tuned with a tuning element such as for example a coil will show a relatively bad efficiency.
  • An antenna of 12 cm length and operating at 40 MHz is equivalent to a capacitance of about 2 pF in series with a resistance of about 1 Ohm.
  • the radiating efficiency will be about 2%.
  • the circuit 2 having a tuning function as well as an efficiency increasing function the latter in response to a feedback signal originating from the amplifier 3, the radiating efficiency can be increased up to 4%.
  • the antenna 1 may be of any shape.
  • the antenna 1 is preferably an electrical antenna having an electrical length of at most 20% of a wavelength of (a center frequency of) the frequency band, such as for example 1% to 5% of this wavelength. This allows the device 10 according to the invention to be of an even smaller size.
  • the antenna 1 may be a non-loop antenna having a substantially omni directional radiation pattern. Such an antenna 1 allows the device 10 according to the invention to be used without an orientation of the device 10 being of too much importance.
  • the feedback between the amplifier 3 and the circuit 2 is a positive feedback, such that the amplifier does not get into an unstable state.
  • the coupling capacitor 41 provides more feedback at higher frequencies and less feedback at lower frequencies. This results in the increase of the efficiency of the combination of the antenna 1 and the circuit 2 being more constant over the frequency band.
  • the transistor 31 may have a high input impedance (FET, MOSFET), to reduce its influence on the circuit 2. This capacitor 25 reduces user-effects and/or surrounding-effects.
  • the antenna 1 comprises a capacitive antenna, in which case the coil 21 (an inductor) is to be used for tuning the antenna 1.
  • the antenna 1 comprises an inductive antenna
  • a capacitor is to be used for tuning the antenna 1.
  • capacitive antennas are to be preferred.
  • a device 10 according to the invention is shown diagrammatically in greater detail.
  • the device 10 comprises the antenna 1 and the circuit 2 according to the invention and the amplifier 3.
  • the circuit 2 corresponds with the circuit 2 shown in Fig. 2, apart from the fact that, roughly, the further coil 22 (an inductor) has been replaced by a serial circuit of a first capacitor 23 and a second capacitor 24.
  • a first side of the first capacitor 23 is coupled to the first side of the coil 21, a second side of the first capacitor 23 is coupled to a first side of the second capacitor 24 and to the amplifier 3, and a second side of the second capacitor 24 is coupled to ground.
  • a common point of both capacitors 23 and 24 forms the feedback input of the circuit 2.
  • capacitors 23 and 24 on the one hand and the capacitor 25 on the other hand may be combined and/or integrated with each other.
  • Fig. 4 a transfer response comprising a first curve without feedback and a second curve with feedback is shown. Obviously, an amplitude increase of 10 dB or more can be achieved, which is a great advantage.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

L'invention concerne des dispositifs (10) comprenant des antennes (1) pour recevoir des signaux de radiofréquence dans des bandes de fréquence dotées de circuits (2) pour raccorder les antennes (1) à la bande de fréquence, ainsi que, en réponse à des signaux de rétroaction, pour augmenter les efficacités de combinaisons des antennes accordées (1) et des circuits (2). De tels dispositifs (10) sont simples et peu coûteux. Les antennes (1) sont des antennes électriques présentant une longueur électrique inférieure ou égale à 20 % d'une longueur d'onde de la bande de fréquence et présentant un motif de rayonnement omnidirectionnel. Des amplificateurs (3) amplifient les signaux d'antenne provenant des antennes (1) par les circuits (2) et fournissent les signaux de rétroaction aux circuits (2). Une rétroaction entre les amplificateurs (3) et les circuits (2) est une rétroaction positive et est telle que les amplificateurs (3) sont stables. Les circuits (2) comprennent des bobines (21) pour accorder les antennes (1) et d'autres bobines (22) ou des condensateurs (23, 24) pour recevoir les signaux de rétroaction provenant des amplificateurs (3).
PCT/IB2006/051847 2005-06-14 2006-06-09 Dispositif pour recevoir un signal de radiofrequence dans une bande de frequence WO2006134533A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05105200 2005-06-14
EP05105200.9 2005-06-14

Publications (1)

Publication Number Publication Date
WO2006134533A1 true WO2006134533A1 (fr) 2006-12-21

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ID=37076305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/051847 WO2006134533A1 (fr) 2005-06-14 2006-06-09 Dispositif pour recevoir un signal de radiofrequence dans une bande de frequence

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WO (1) WO2006134533A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11665897B2 (en) 2017-10-30 2023-05-30 Taiwan Semiconductor Manufacturing Co., Ltd. Improving surface topography by forming spacer-like components

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824473A (en) * 1971-12-09 1974-07-16 Texas Instruments Inc Trf radio receiver with enhanced q aerial tuned circuit and frequency response compensation in the low frequency amplifier
US6055420A (en) * 1990-06-19 2000-04-25 Bose Corproation Antenna system having a high Q circuit
JP2005064948A (ja) * 2003-08-14 2005-03-10 Matsushita Electric Ind Co Ltd アンテナ整合装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824473A (en) * 1971-12-09 1974-07-16 Texas Instruments Inc Trf radio receiver with enhanced q aerial tuned circuit and frequency response compensation in the low frequency amplifier
US6055420A (en) * 1990-06-19 2000-04-25 Bose Corproation Antenna system having a high Q circuit
JP2005064948A (ja) * 2003-08-14 2005-03-10 Matsushita Electric Ind Co Ltd アンテナ整合装置
EP1655850A1 (fr) * 2003-08-14 2006-05-10 Matsushita Electric Industrial Co., Ltd. Dispositif d'appariement pour antenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11665897B2 (en) 2017-10-30 2023-05-30 Taiwan Semiconductor Manufacturing Co., Ltd. Improving surface topography by forming spacer-like components

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