WO2012157314A1 - Dispositif antenne - Google Patents

Dispositif antenne Download PDF

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Publication number
WO2012157314A1
WO2012157314A1 PCT/JP2012/055181 JP2012055181W WO2012157314A1 WO 2012157314 A1 WO2012157314 A1 WO 2012157314A1 JP 2012055181 W JP2012055181 W JP 2012055181W WO 2012157314 A1 WO2012157314 A1 WO 2012157314A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
radiating element
antenna device
tuning circuit
reactance
Prior art date
Application number
PCT/JP2012/055181
Other languages
English (en)
Japanese (ja)
Inventor
藤枝重雪
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2012157314A1 publication Critical patent/WO2012157314A1/fr

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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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H01Q9/145—Length of element or elements adjustable by varying the electrical length
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to a small antenna device in which the resonance frequency of the antenna is variable.
  • Patent Document 1 discloses a small antenna device that can switch the resonance frequency of an antenna.
  • FIG. 1 is a perspective view showing a configuration example of the antenna device.
  • a dielectric core antenna 1 includes a rectangular parallelepiped dielectric core 2 having a predetermined dielectric constant, an electrode 3 is formed on the upper surface of the dielectric core 2, and the lower surface facing the same.
  • An electrode 4 is formed on the substrate.
  • a third electrode 5 that connects between the first and second electrodes 3 and 4 is formed on one surface that connects these opposing surfaces.
  • a notch 6 having a predetermined length and width is provided in parallel to the first electrode 3 and the second electrode 4 from one edge of the third electrode 5, and the variable capacitor 7 is provided between the upper and lower edges of the notch 6. Is connected.
  • the dielectric core antenna 1 is fed by directly connecting the inner conductor 9 of the coaxial cable 8 to a predetermined point of the second electrode 4.
  • the variable width of the variable amount of reactance of the variable capacitance element 7 is not large, and the frequency cannot be varied over a wide band.
  • a nonlinear element such as the variable capacitance element 7 is deteriorated in characteristics due to distortion when a large amount of power is input. Therefore, a stable characteristic cannot be obtained in an antenna device that handles high power.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an antenna device capable of adjusting a resonance frequency over a wide band and solving the problem of distortion due to a tuning circuit.
  • the antenna device of the present invention is configured as follows. (1) a radiating element having a first end opened and a second end connected to the feeder circuit side; A first tuning circuit connected between an intermediate point from the first end to the second end of the radiating element and the power supply circuit, and the tuning circuit includes a plurality of short-circuit paths configured by reactance elements. And a switch that switches between these short-circuit paths.
  • the reactance circuit is provided between the second end of the radiating element and the midpoint.
  • the plurality of short-circuit paths include a circuit constituted by an inductor or a capacitor.
  • a second tuning circuit is provided between the second end of the radiating element and the power feeding circuit, and the second tuning circuit includes a plurality of short-circuit paths formed of reactance elements, and these It is assumed that the switch is configured by a switch for switching the short-circuit path.
  • a third tuning circuit is provided between the intermediate point and the first end of the radiating element, and the third tuning circuit includes a plurality of short-circuit paths formed of reactance elements. And a switch for switching these short-circuit paths.
  • a part of the radiating element and the first tuning circuit is composed of a conductor pattern formed on a dielectric substrate.
  • a part of the radiating element and the first tuning circuit is composed of a conductor pattern formed on a flexible substrate.
  • the said flexible substrate is arrange
  • the present invention it is possible to adjust the frequency over a wide band by switching a plurality of short-circuit paths of the tuning circuit.
  • the tuning circuit since no nonlinear element is used in the tuning circuit, characteristic deterioration due to distortion due to the nonlinear element does not occur.
  • FIG. 1 is a perspective view of the antenna device disclosed in Patent Document 1.
  • FIG. FIG. 2 is a circuit diagram of the antenna device of the first embodiment.
  • FIG. 3 is a circuit configuration example of the first tuning circuit 31 shown in FIG.
  • FIG. 4 is a diagram showing the frequency characteristics of the return loss (S11) of the antenna device 101.
  • FIG. 5 is a circuit diagram of the antenna device of the second embodiment.
  • FIG. 6 is a circuit diagram of the antenna device of the third embodiment.
  • FIG. 7 is a circuit diagram of the first tuning circuit 31 shown in FIG.
  • FIG. 8 is a diagram showing the frequency characteristics of the return loss (S11) of the antenna device 103.
  • FIG. 9 is a circuit diagram of the antenna device 104 according to the fourth embodiment.
  • FIG. 10 is a diagram illustrating the frequency characteristics of the return loss (S11) of the antenna device 104.
  • FIG. 11 is a circuit diagram of the antenna device 105 of the fifth embodiment.
  • FIG. 2 is a circuit diagram of the antenna device of the first embodiment.
  • the antenna device 101 includes a radiating element 20, a first tuning circuit 31, and a matching circuit 40.
  • the first end P1 of the radiating element 20 is opened, and the second end P2 of the radiating element 20 is connected to the matching circuit 40 (that is, to the feeding circuit side).
  • the matching circuit 40 matches the impedance between the radiating element 20 and the feeding circuit connected to the feeding circuit connection end FP.
  • the inductor Ls is connected in series and the inductor Lp is connected to the shunt.
  • the first tuning circuit 31 is a circuit capable of switching the reactance, and is connected between the midpoint Pm of the radiating element 20 and the second end P2.
  • the first tuning circuit 31 is composed of a plurality of short-circuit paths composed of reactance elements and a switch for switching these short-circuit paths.
  • the first tuning circuit 31 is a circuit that connects (short-circuits) the intermediate point Pm of the radiating element 20 and the second end P2 via a reactance element.
  • FIG. 3 is a circuit configuration example of the first tuning circuit 31.
  • the first tuning circuit 31 includes reactance elements La, Ca, Cb and the like and a switch 311. For example, if the switch 311 selects the connection portion (1) of the reactance element La, the intermediate point Pm of the radiating element 20 and the second end P2 are connected (short-circuited) via the reactance element La. Further, when the switch 311 selects, for example, the open end (0), the midpoint Pm of the radiating element 20 is in an open (non-short circuit) state with respect to the second end P2.
  • the resonance frequency is determined at the portion from the second end P2 to the first end P1 of the radiating element 20 (with the original radiating element 20).
  • the switch 311 of the first tuning circuit 31 selects the connection portion (1) ⁇ of the reactance element La
  • the second tuning circuit 31 passes through the reactance element La of the first tuning circuit 31 from the second end P2 of the radiation element 20.
  • the resonance frequency is determined by the portion up to the first end P1 of the radiating element. At this resonance frequency, almost no current is distributed in the path from the second end P2 of the radiating element 20 to the midpoint Pm.
  • the first tuning circuit 31 acts as a short circuit path provided to the radiating element 20, and the physical current path length of the radiating element can be changed by the short circuit path.
  • a reactance variable circuit is inserted in series with respect to a location close to the matching circuit 40 to adjust the frequency, a series resistance component is generated, which causes a gain deterioration.
  • the physical current path length does not change, it is difficult to adjust the frequency over a wide band.
  • FIG. 4 is a diagram showing the frequency characteristics of the return loss (S11) of the antenna device 101.
  • the return loss characteristic RL0 is a characteristic when the first tuning circuit 31 is open
  • the return loss characteristic RL1 is a characteristic when the first tuning circuit 31 selects the reactance element La
  • the return loss characteristic RLn is This is a characteristic when the first tuning circuit 31 selects the reactance element Cb.
  • the resonance frequency of the antenna device can be adjusted over a wide band by switching the switch 311 in the first tuning circuit 31.
  • a non-linear element such as a variable capacitance diode is not used, distortion does not occur.
  • FIG. 5 is a circuit diagram of the antenna device of the second embodiment.
  • the antenna device 102 includes a radiating element 20, reactance elements L 1 and L 2, a first tuning circuit 31, and a matching circuit 40.
  • the first end P1 of the radiating element 20 is open.
  • a tuning circuit 31 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a reactance circuit including a reactance element L2 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a reactance circuit including a reactance element L1 is connected between the second end P2 of the radiating element 20 and the matching circuit 40.
  • the reactance element L2 increases the inductance component from the second end P2 of the radiating element 20 to the midpoint Pm.
  • the reactance element L1 increases an inductance component from the second end P2 of the radiating element 20 to the matching circuit 40.
  • the physical length of the radiating element 20 required to obtain a predetermined resonance frequency can be shortened by the inductance component of the reactance element L1.
  • the path length from the second end P2 of the radiating element 20 to the midpoint Pm can be shortened by the inductance component of the reactance element L2. Accordingly, the path from the intermediate point Pm to the first end P1, that is, the part contributing to radiation can be made long, so that a high gain can be maintained while being small.
  • FIG. 6 is a circuit diagram of the antenna device of the third embodiment.
  • the antenna device 103 includes a radiating element 20, reactance elements L 1 and L 2, a first tuning circuit 31, and a matching circuit 40.
  • the first end P1 of the radiating element 20 is open.
  • a tuning circuit 31 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a reactance circuit including a reactance element L2 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a reactance circuit including a reactance element L1 is connected between the second end P2 of the radiating element 20 and the matching circuit 40.
  • the configuration of the first tuning circuit 31 is different from the antenna device 102 shown in FIG.
  • FIG. 7 is a circuit diagram of the first tuning circuit 31.
  • the first tuning circuit 31 includes a plurality of LC parallel circuits in which inductors and capacitors are connected in parallel.
  • An LC parallel circuit including an inductor La and a capacitor Ca is connected to the connection portion (1) of the switch 311. Further, an LC parallel circuit including an inductor Lb and a capacitor Cb is connected to the connection portion (2).
  • the LC parallel circuit is similarly connected to the other connection portions. If the switch 311 selects the connection portion (1), the intermediate point Pm of the radiating element 20 and the second end P2 are connected via an LC parallel circuit including an inductor La and a capacitor Ca. If the switch 311 selects the connection portion (2), the intermediate point Pm of the radiating element 20 and the second end P2 are connected via an LC parallel circuit including the inductor Lb and the capacitor Cb.
  • FIG. 8 is a diagram showing the frequency characteristics of the return loss (S11) of the antenna device 103.
  • the return loss characteristics RL11 and RL12 are characteristics when the switch 311 of the first tuning circuit 31 is selecting the connection (1), and the return loss characteristics RL21 and RL22 are the switch 311 selecting the connection (2) It is a characteristic when doing.
  • return loss characteristics RLn1 and RLn2 are characteristics when the switch 311 selects the connection (n).
  • inductive and capacitive resonance frequencies can be obtained by inserting an LC parallel circuit into a part of the current path of the radiating element 20. That is, resonance occurs at two resonance frequencies, that is, a resonance frequency mainly in the path passing through the inductor in the LC parallel circuit and a resonance frequency mainly in the path passing through the capacitor. Then, by switching LC parallel circuits having different inductance values and capacitance values with a switch, the pair of the two resonance frequencies can be switched, and the resonance frequency of the antenna device can be adjusted over a wide band.
  • FIG. 9 is a circuit diagram of the antenna device 104 according to the fourth embodiment.
  • the antenna device 104 includes a radiating element 20, reactance elements L 1 and L 2, a first tuning circuit 31, a second tuning circuit 32, and a matching circuit 40.
  • the first end P1 of the radiating element 20 is open.
  • a tuning circuit 31 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a reactance circuit including a reactance element L2 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • the reactance circuit by the reactance element L1 and the second tuning circuit 32 are connected.
  • the second tuning circuit 32 includes a plurality of reactance elements and a switch for switching them.
  • the resonance frequency is adjusted by a combination of switching of the switch of the first tuning circuit 31 and switching of the switch of the second tuning circuit 32.
  • the shift amount of the resonance frequency per reactance change of the first tuning circuit 31 is larger than the shift amount of the resonance frequency per reactance change of the second tuning circuit 32. Therefore, the reactance value to be switched by each tuning circuit may be determined so that the resonance frequency is coarsely adjusted by the first tuning circuit 31 and finely adjusted by the second tuning circuit 32.
  • FIG. 10 is a diagram showing the frequency characteristics of the return loss (S11) of the antenna device 104.
  • the return loss characteristics RL11 and RL12 are characteristics when the switch 311 of the first tuning circuit 31 is selecting the connection (1), and the return loss characteristics RL21 and RL22 are the switch 311 selecting the connection (2) It is a characteristic when doing.
  • return loss characteristics RLn1 and RLn2 are characteristics when the switch 311 selects the connection (n).
  • the return loss characteristics RL11, RL21, and RLn1 are characteristics when the switch of the second tuning circuit 32 selects the first connection portion, and the return loss characteristics RL12, RL22, and RLn2 are the characteristics of the second tuning circuit 32. This is a characteristic when the switch selects the second connection portion.
  • the resonance frequency of the antenna device can be finely adjusted over a wide band.
  • FIG. 11 is a circuit diagram of the antenna device 105 of the fifth embodiment.
  • the antenna device 105 includes a radiating element 20, reactance elements L 1 and L 2, a first tuning circuit 31, a third tuning circuit 33, and a matching circuit 40.
  • the first end P1 of the radiating element 20 is open.
  • a tuning circuit 31 is connected between the second end P2 of the radiating element 20 and the midpoint Pm.
  • a third tuning circuit 33 is connected between the first end P1 of the radiating element 20 and the midpoint Pm.
  • the third tuning circuit 33 includes a plurality of reactance elements and a switch for switching them.
  • the resonance frequency is adjusted by a combination of switching of the switch of the first tuning circuit 31 and switching of the switch of the third tuning circuit 33.
  • the resonance frequency shift amount per reactance change of the first tuning circuit 31 is larger than the resonance frequency shift amount per reactance change of the third tuning circuit 33. Therefore, as in the case of the fourth embodiment, the resonance frequency is roughly adjusted by the first tuning circuit 31 and finely adjusted by the third tuning circuit 33. You just have to decide.
  • the circuit and characteristics of the antenna device have been described, but some forms can be taken in terms of structure.
  • the radiating element 20 and a part of the first tuning circuit 31 are configured by a conductor pattern on a block-like or plate-like dielectric substrate.
  • a part of the radiating element 20 and the first tuning circuit 31 is formed of a conductor pattern on a flexible substrate.
  • the radiating element 20 is configured by a conductor pattern on a dielectric substrate
  • a part of the first tuning circuit 31 is configured by a conductor pattern on a flexible substrate, and the flexible substrate is disposed along the dielectric substrate. May be.
  • a part of the radiating element 20 and the tuning circuit 31 may be configured as a conductor pattern on a flexible substrate, and the flexible substrate may be disposed along the dielectric substrate.
  • the second tuning circuit 32 and the third tuning circuit 33 which may be formed on a dielectric substrate or a flexible substrate.
  • the reactance elements of the first to third tuning circuits can be configured with a conductor pattern on a dielectric substrate or a flexible substrate, but a chip component may be mounted as necessary.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un dispositif antenne (101) comprenant un élément rayonnant (20), un premier circuit d'accord (31) et un circuit d'adaptation (40). L'élément rayonnant (20) comprend une première borne ouverte (P1) et une deuxième borne (P2) connectée (du côté circuit d'alimentation) au circuit d'adaptation (40). Le circuit d'adaptation (40) adapte l'impédance entre un circuit d'alimentation, qui est connecté à une borne de connexion de circuit d'alimentation (FP), et l'élément rayonnant (20). Le premier circuit d'accord (31) permet de commuter la réactance et est connecté entre le point médian (Pm) et la deuxième borne (P2) de l'élément rayonnant (20). Le premier circuit d'accord (31) comprend une pluralité de trajets de court-circuit formés à partir des éléments de réactance, ainsi qu'un commutateur qui commute lesdits trajets. La fréquence de résonance du dispositif antenne est réglée par commutation du commutateur.
PCT/JP2012/055181 2011-05-19 2012-03-01 Dispositif antenne WO2012157314A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011112209 2011-05-19
JP2011-112209 2011-05-19

Publications (1)

Publication Number Publication Date
WO2012157314A1 true WO2012157314A1 (fr) 2012-11-22

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PCT/JP2012/055181 WO2012157314A1 (fr) 2011-05-19 2012-03-01 Dispositif antenne

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WO (1) WO2012157314A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015026199A1 (fr) 2013-08-23 2015-02-26 Samsung Electronics Co., Ltd. Dispositif électronique et son procédé de fonctionnement
CN105474460A (zh) * 2013-08-23 2016-04-06 三星电子株式会社 电子设备及其操作方法
CN105811079A (zh) * 2014-12-31 2016-07-27 联想(北京)有限公司 一种天线装置及电子设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000114856A (ja) * 1998-09-30 2000-04-21 Nec Saitama Ltd 逆ｆアンテナおよびそれを用いた無線装置
JP2004096341A (ja) * 2002-08-30 2004-03-25 Fujitsu Ltd 共振周波数が可変な逆ｆ型アンテナを含むアンテナ装置
JP2011015034A (ja) * 2009-06-30 2011-01-20 Murata Mfg Co Ltd アンテナ構造

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000114856A (ja) * 1998-09-30 2000-04-21 Nec Saitama Ltd 逆ｆアンテナおよびそれを用いた無線装置
JP2004096341A (ja) * 2002-08-30 2004-03-25 Fujitsu Ltd 共振周波数が可変な逆ｆ型アンテナを含むアンテナ装置
JP2011015034A (ja) * 2009-06-30 2011-01-20 Murata Mfg Co Ltd アンテナ構造

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015026199A1 (fr) 2013-08-23 2015-02-26 Samsung Electronics Co., Ltd. Dispositif électronique et son procédé de fonctionnement
CN105474460A (zh) * 2013-08-23 2016-04-06 三星电子株式会社 电子设备及其操作方法
EP3036792A1 (fr) * 2013-08-23 2016-06-29 Samsung Electronics Co., Ltd. Dispositif électronique et son procédé de fonctionnement
EP3036792A4 (fr) * 2013-08-23 2017-04-05 Samsung Electronics Co., Ltd. Dispositif électronique et son procédé de fonctionnement
US9960489B2 (en) 2013-08-23 2018-05-01 Samsung Electronics Co., Ltd. Electronic device and method of operating the same
CN105474460B (zh) * 2013-08-23 2018-08-10 三星电子株式会社 电子设备及其操作方法
CN105811079A (zh) * 2014-12-31 2016-07-27 联想(北京)有限公司 一种天线装置及电子设备
CN105811079B (zh) * 2014-12-31 2020-05-26 联想(北京)有限公司 一种天线装置及电子设备

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