WO2021181546A1 - Circuit de découplage - Google Patents

Circuit de découplage Download PDF

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Publication number
WO2021181546A1
WO2021181546A1 PCT/JP2020/010445 JP2020010445W WO2021181546A1 WO 2021181546 A1 WO2021181546 A1 WO 2021181546A1 JP 2020010445 W JP2020010445 W JP 2020010445W WO 2021181546 A1 WO2021181546 A1 WO 2021181546A1
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WO
WIPO (PCT)
Prior art keywords
circuit
terminal
resonant
input
resonant circuit
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Application number
PCT/JP2020/010445
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English (en)
Japanese (ja)
Inventor
西本　研悟
西岡　泰弘
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三菱電機株式会社
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.)
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021564108A priority Critical patent/JP7026869B2/ja
Priority to PCT/JP2020/010445 priority patent/WO2021181546A1/fr
Publication of WO2021181546A1 publication Critical patent/WO2021181546A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure

Definitions

  • the present invention relates to a decoupling circuit connected to a plurality of antennas mounted on a wireless communication device or the like.
  • Patent Document 1 discloses a dual-frequency shared decoupling circuit composed of a transmission line connected to each of two antennas and a filter circuit connected between the ends of each transmission line.
  • Patent Document 1 also discloses a configuration in which two or more filter circuits are provided between each transmission line, and it is said that this configuration can improve versatility, but there is a problem that the circuit size and the circuit loss increase. was there.
  • the present invention has been made to solve the above-mentioned problems, and is highly versatile and compact in that the antenna-to-antenna coupling can be reduced in two frequency bands regardless of the amplitude and phase of the two-element antenna coupling.
  • the purpose is to obtain a simple decoupling circuit.
  • the decoupling circuit according to the present invention is connected between the first terminal, the second terminal, the third terminal, the fourth terminal, and the first terminal and the second terminal.
  • a third resonance circuit and a fourth resonance circuit connected between the third terminal and the fourth terminal are provided.
  • the present invention it is possible to realize a highly versatile, compact and simple decoupling circuit capable of reducing the inter-antenna coupling in two frequency bands regardless of the amplitude and phase of the two-element antenna coupling.
  • FIG. It is a circuit diagram which shows the reduced coupling circuit which concerns on Embodiment 1.
  • FIG. It is a circuit diagram which shows the reduced coupling circuit when the resonance circuit 1 and the resonance circuit 4 are the parallel resonance circuit of an inductor and a capacitor, and the resonance circuit 2 and the resonance circuit 3 are a series resonance circuit of an inductor and a capacitor.
  • FIG. 1 It is a figure which shows the structure of the two-element antenna used when the electromagnetic field simulation was performed with respect to the reduced coupling circuit which concerns on Embodiment 1.
  • FIG. 5 It is a calculation result of mutual coupling when only the two-element antenna of FIG. 5 is used and when the decoupling circuit according to the first embodiment is applied to the two-element antenna of FIG.
  • It is a circuit diagram which shows the decoupling circuit which concerns on Embodiment 2.
  • FIG. 1 is a circuit diagram showing a decoupling circuit according to the present embodiment.
  • the decoupling circuit includes an input / output terminal 1 (first terminal), an input / output terminal 2 (second terminal), an input / output terminal 3 (third terminal), and an input / output terminal 4 (fourth terminal).
  • (Terminal), resonance circuit 11 (first resonance circuit), resonance circuit 12 (second resonance circuit), resonance circuit 13 (third resonance circuit), resonance circuit 14 (fourth resonance circuit) are provided. Has been done.
  • an antenna element 101 (first antenna element) and an antenna element 102 (second antenna element) are connected to the input / output terminal 1 and the input / output terminal 2, respectively, and input / output is performed. It is assumed that the terminal 3 and the input / output terminal 4 are provided with feeding points.
  • the reference surface t1 and the reference surface t2 represent surfaces for observing the S-parameters of the two ports on the antenna side.
  • One end of the resonance circuit 11 is connected to the input / output terminal 1, and the other end is connected to the input / output terminal 2.
  • One end of the resonance circuit 12 is connected to the input / output terminal 1, and the other end is connected to the input / output terminal 3.
  • One end of the resonance circuit 13 is connected to the input / output terminal 2, and the other end is connected to the input / output terminal 4.
  • One end of the resonance circuit 14 is connected to the input / output terminal 3, and the other end is connected to the input / output terminal 4.
  • the resonant circuit 11 shown in the reduced coupling circuit of FIG. 1 is a parallel resonant circuit of the inductor 21 and the capacitor 31
  • the resonant circuit 12 is a series resonant circuit of the inductor 22 and the capacitor 32.
  • 13 is a series resonant circuit of the inductor 23 and the capacitor 33
  • the resonant circuit 14 is a parallel resonant circuit of the inductor 24 and the capacitor 34.
  • One end of the inductor 21 and one end of the capacitor 31 are connected to the input / output terminal 1, and the other end of the inductor 21 and the other end of the capacitor 31 are connected to the input / output terminal 2.
  • One end of the inductor 22 is connected to the input / output terminal 1, the other end of the inductor 22 is connected to one end of the capacitor 32, and the other end of the capacitor 32 is connected to the input / output terminal 3.
  • One end of the inductor 23 is connected to the input / output terminal 2, the other end of the inductor 23 is connected to one end of the capacitor 33, and the other end of the capacitor 33 is connected to the input / output terminal 4.
  • One end of the inductor 24 and one end of the capacitor 34 are connected to the input / output terminal 3, and the other end of the inductor 24 and the other end of the capacitor 34 are connected to the input / output terminal 4.
  • the resonant circuit 11 shown in the reduced coupling circuit of FIG. 1 is a series resonant circuit of the inductor 25 and the capacitor 35
  • the resonant circuit 12 is a parallel resonant circuit of the inductor 26 and the capacitor 36
  • 13 is a parallel resonant circuit of the inductor 27 and the capacitor 37
  • the resonant circuit 14 is a series resonant circuit of the inductor 28 and the capacitor 38.
  • One end of the inductor 25 is connected to the input / output terminal 1, the other end of the inductor 25 is connected to one end of the capacitor 35, and the other end of the capacitor 35 is connected to the input / output terminal 2.
  • One end of the inductor 26 and one end of the capacitor 36 are connected to the input / output terminal 1, and the other end of the inductor 26 and the other end of the capacitor 36 are connected to the input / output terminal 3.
  • One end of the inductor 27 and one end of the capacitor 37 are connected to the input / output terminal 2, and the other end of the inductor 27 and the other end of the capacitor 37 are connected to the input / output terminal 4.
  • One end of the inductor 28 is connected to the input / output terminal 3
  • the other end of the inductor 28 is connected to one end of the capacitor 38
  • the other end of the capacitor 38 is connected to the input / output terminal 4.
  • FIG. 4 shows a decoupling circuit that reduces the coupling between two element antennas at one frequency.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • 51 to 54 are reactances.
  • One end of the reactance 51 is connected to the input / output terminal 1, and the other end is connected to the input / output terminal 2.
  • One end of the reactance 52 is connected to the input / output terminal 1, and the other end is connected to the input / output terminal 3.
  • One end of the reactance 53 is connected to the input / output terminal 2, and the other end is connected to the input / output terminal 4.
  • One end of the reactance 54 is connected to the input / output terminal 3, and the other end is connected to the input / output terminal 4.
  • the antenna element 101 is connected to the input / output terminal 1, and the antenna element 102 is connected to the input / output terminal 2.
  • S-parameters of the 2 ports from the reference plane t1 viewed antenna elements 101 and 102 side is S a
  • S-parameters of the two ports from the reference plane t2 viewed antenna elements 101 and 102 side and S b is set to R 0 .
  • R 0 is usually 50 ⁇ , but is not limited here.
  • reactance 51 is X 1
  • reactance 52 and reactance 53 are X 2
  • reactance 54 is X 3
  • the equations (1) to (3) are in the same order as the compound. As described above, in the decoupling circuit of FIG. 4, the reactances 51 to 54 can be determined only by the reference impedance R0 , regardless of the inter-antenna coupling Sa21 and the frequency when the antenna element side is viewed from the reference surface t1. Further, as shown in the equations (1) to (3), there are two combinations of X 1 , X 2 , and X 3 that make the interconnection 0.
  • f 1 and f 2 (f 1 ⁇ f 2 ) be the frequencies for which the coupling between antennas is to be reduced.
  • the frequency f 1 the reactance of the resonant circuit 11 X L1, the reactance of the resonant circuit 12, 13 X L2, the reactance of the resonant circuit 14 and X L3.
  • the reactance of the resonant circuit 11 X H1 the reactance of the resonant circuit 12, 13 X H2, the reactance of the resonant circuit 14 and X H3.
  • the resonant circuit 11 is a parallel resonant circuit of the inductor 21 and the capacitor 31
  • the resonant circuit 12 is a series resonant circuit of the inductor 22 and the capacitor 32
  • the resonant circuit 13 is the inductor 23.
  • a series resonance circuit of a capacitor 33, the resonant circuit 14 if the parallel resonant circuit of inductor 24 and capacitor 34, the frequency f 1, the formula (4) at a frequency f 2, can be realized reactance of formula (5).
  • the inductance of the inductor 21 is La 1
  • the inductance of the inductor 22 is La 2
  • the inductance of the inductor 23 is La 2
  • the inductance of the inductor 24 is La 3
  • the capacitance of the capacitor 31 is C a 1
  • the capacitance of the capacitor 32 is C a 2.
  • the capacitance of the capacitor 33 is C a2 and the capacitance of the capacitor 34 is C a3
  • the resonant circuit 11 is a series resonant circuit of the inductor 25 and the capacitor 35
  • the resonant circuit 12 is a parallel resonant circuit of the inductor 26 and the capacitor 36
  • the resonant circuit 13 is the inductor 27. If the parallel resonance circuit of the capacitor 37 is used and the resonance circuit 14 is a series resonance circuit of the inductor 28 and the capacitor 38, the reactors of the equations (12) and (13) can be realized at the two frequencies of f 1 and f 2.
  • the inductance of the inductor 25 is L b1
  • the inductance of the inductor 26 is L b2
  • the inductance of the inductor 27 is L b2
  • the inductance of the inductor 28 is L b3
  • the capacitor 35 is C b1
  • the capacitance of the capacitor 36 is C b2
  • the values of eight lumped constant elements composed of an inductor and a capacitor are determined only by the frequency and the reference impedance, regardless of the inter-antenna coupling Sa21. Therefore, a highly versatile dual-frequency decoupling circuit can be obtained. Further, since it is composed of only eight lumped constant elements including an inductor and a capacitor, the circuit can be miniaturized. Moreover, the circuit can be simplified.
  • FIG. 5 is a diagram showing a configuration of a two-element antenna used when performing an electromagnetic field simulation.
  • 151 is a ground conductor plate
  • 201 and 202 are feeding points.
  • ⁇ 1 is a free space wavelength at frequency f 1.
  • FIG. 5 shows an example of a configuration of a two-element antenna, and the antenna configuration to which the decoupling circuit according to the first embodiment can be applied is not limited to this.
  • the antenna elements 101 and 102 can be applied to all antennas such as dipole antennas and patch antennas, and their arrangement and shape are not limited.
  • a feeding point 201 is provided between the antenna element 101 and the ground conductor plate 151, and a feeding point 202 is provided between the antenna element 102 and the ground conductor plate 151.
  • the dimensions of the ground conductor plate 151, the dimensions and the distance between the antenna element 101 and the antenna element 102 are described with reference to ⁇ 1.
  • f 2 1.51 ⁇ f 1 .
  • Each length of the antenna elements 101,102 0.20 ⁇ 1, distance of the antenna element 101 and antenna element 102 is set to 0.25 [lambda 1.
  • the size of the ground conductor plate 151 is 0.50 ⁇ 1 ⁇ 1.00 ⁇ 1 .
  • the reference impedance R 0 50 ⁇ .
  • Antenna elements 101 and 102 in FIG. 5 is a branched monopole dualband, as a result of electromagnetic field simulation, the reflection amplitude is reduced and -40 dB -35 dB, at f 2 in f 1. Since the antenna element 101 and the antenna element 102 have a symmetrical structure, the reflections of the antenna elements 101 and 102 are the same. Mutual coupling between antennas is higher with -6.1DB -7.0 dB, in f 2 in f 1.
  • FIG. 6 shows the calculation result of mutual coupling with and without the decoupling circuit of FIG.
  • the horizontal axis is the frequency normalized by f 1.
  • the mutual coupling when there is a decoupling circuit is the coupling
  • cross-coupling is reduced, it can be confirmed that the -38.0dB -37.9dB, the f 2 in f 1.
  • the inductances of the inductors 21 to 28 may be realized by a plurality of inductors and capacitors, respectively.
  • the capacitance values of commercially available capacitors are discrete, the capacitances of the capacitors 31 to 38 may be realized by a plurality of inductors and capacitors, respectively.
  • the decoupling circuit As described above, by configuring the decoupling circuit with the input / output terminals 1 to 4 and the resonance circuits 11 to 14, the antenna element 101 connected to the input / output terminal 1 and the input / output terminal 2 are connected to each other. It has the effect of obtaining a compact and simple decoupling circuit that reduces the mutual coupling of the antenna elements 102 in two frequency bands. Further, the mutual coupling can be reduced in two frequency bands regardless of the amplitude and phase of the mutual coupling between the antenna element 101 and the antenna element 102 when the decoupling circuit according to the present embodiment is not applied. It has the effect of obtaining a highly versatile decoupling circuit.
  • Embodiment 2 When the decoupling circuit according to the first embodiment is applied to a two-element antenna, the mutual coupling can be reduced, but the reflection amplitude cannot be reduced (the reflection amplitude may be high). In this embodiment, a decoupling circuit that reduces the reflection amplitude will be described.
  • FIG. 7 is a diagram showing a configuration of a reduced coupling circuit used in the present embodiment.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • 61 is a matching circuit inserted between one end of the resonant circuit 14 and the input / output terminal 3
  • 62 is a matching circuit inserted between the other end of the resonant circuit 14 and the input / output terminal 4.
  • t3 is a reference plane, the antenna element 101 from the reference surface t3, the S-parameters of the two-port viewed antenna element 102 side and S c.
  • the matching circuit 61 and the matching circuit 62 are mutually connected as shown in FIG. can be independently adjusted, the reflection amplitudes in the reference plane t3 at 2 frequency
  • the matching circuits 61 and 62 may be composed of lumped constant elements such as inductors and capacitors, or may be composed of distributed constant lines. Further, it may be configured by a combination of these.
  • the reflection amplitude is reduced by inserting the matching circuit 61 between one end of the resonance circuit 14 and the input / output terminal 3 and the matching circuit 62 between the other end of the resonance circuit 14 and the input / output terminal 4. It is possible to obtain a reduced coupling circuit.
  • Embodiment 3 In the first embodiment, the case where the reflection amplitudes of the antenna elements 101 and 102 are reduced in advance at the two frequencies f1 and f2 was examined. In this embodiment, a decoupling circuit in which a matching circuit is inserted after the antenna elements 101 and 102 will be described.
  • the reflection amplitudes of the antenna elements 101 and 102 are reduced, or the reflection coefficients of the antenna elements 101 and 102 are in the same amplitude opposite phase. There must be. However, depending on the shape of the antenna elements 101 and 102, the reflection of the antenna elements 101 and 102 may not be reduced at the desired two frequencies f1 and f2.
  • FIG. 8 is a diagram showing a configuration of a reduced coupling circuit used in the present embodiment.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • 63 is a matching circuit inserted between the input / output terminal 1 and one end of the resonance circuit 11
  • 64 is a matching circuit inserted between the input / output terminal 2 and the other end of the resonance circuit 11. It is a circuit.
  • the matching circuits 63 and 64 are installed on the input / output terminal side to which the antenna elements are connected in order to reduce the reflection amplitude of the antenna elements 101 and 102.
  • the matching circuits 63 and 64 may be composed of lumped constant elements such as inductors and capacitors, or may be composed of distributed constant lines. Further, it may be configured by a combination of these.
  • Such a matching circuit 63, 64 by installing the desired second frequency f 1, the reflection amplitudes in the reference plane t1 at f 2
  • the decoupling circuit As described above, by configuring the decoupling circuit with the input / output terminals 1 to 4, the resonance circuits 11 to 14, and the matching circuits 63 and 64, the antenna element 101 connected to the input / output terminal 1 and the input / output are input / output. It has the effect of obtaining a versatile, compact and simple decoupling circuit that reduces the mutual coupling of the antenna elements 102 connected to the terminal 2 in two frequency bands.
  • FIG. 9 is a diagram showing a configuration of a reduced coupling circuit used in the present embodiment.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • 71 is a transmission line inserted between the input / output terminal 1 and one end of the resonance circuit 11
  • 72 is a transmission line inserted between the input / output terminal 2 and the other end of the resonance circuit 11. Is.
  • the reflection of the antenna element 101 is reduced at the input / output terminal 1 and the reflection of the antenna element 102 is reduced at the input / output terminal 2 with respect to the two frequencies f 1 and f 2.
  • the mutual coupling can be reduced, but the reflection amplitude cannot be reduced. Therefore, as described in the second embodiment, the reflection amplitude can be reduced by installing the matching circuits 61 and 62. However, if the reflection amplitude on the reference surface t2 is large, the configurations of the matching circuits 61 and 62 become complicated, and the loss becomes large.
  • the reflection S b11 and the reflection S b22 on the reference surface t2 change depending on the phase of the interconnected S a21 when the antenna elements 101 and 102 are viewed from the reference surface t1. Therefore, by inserting the transmission lines 71 and 72 and adjusting the lengths of the transmission lines 71 and 72 to change the phase of the interconnected Sa21 , the reflection amplitude
  • the matching circuits 61 and 62 can be eliminated, or the loss in the matching circuits 61 and 62 can be reduced.
  • the antenna elements 101 and 102 have a symmetrical structure in the decoupling circuit of FIG.
  • the reflection at the input / output terminal 1 of the antenna element 101 and the reflection at the input / output terminal 2 of the antenna element 102 are the same.
  • the mutual coupling can be reduced by the circuit composed of the resonance circuits 11 to 14. Therefore, the electric length of the transmission line 71 and the electric length of the transmission line 72 are set so as to differ by about 90 degrees at the center frequencies of f 1 and f 2.
  • the reflection S a22 and the reflection S a11 in the reference plane t1 is approximately equal amplitude opposite phase at f 1, f 2. Therefore, even if the reflection amplitudes
  • the antenna element 101 connected to the input / output terminal 1 and the input / output are input / output. It has the effect of reducing the interconnection of the antenna element 102 connected to the terminal 2 in two frequency bands, and obtaining a low-loss or wide-band, highly versatile, compact and simple decoupling circuit.
  • the reduced coupling circuits of the first to fourth embodiments are not limited to connecting the input / output terminals 1 and 2 to the antenna elements 101 and 102, respectively, to reduce the coupling between the antennas.
  • the mutual coupling of the components of the two ports can be reduced by connecting to the input / output terminals 1 and 2.

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Abstract

La présente invention concerne un circuit de découplage comprenant : une première borne (1) ; une deuxième borne (2) ; une troisième borne (3) ; une quatrième borne (4) ; un premier circuit résonnant (11) connecté entre la première borne (1) et la deuxième borne (2) ; un deuxième circuit résonnant (12) connecté entre la première borne (1) et la troisième borne (3) ; un troisième circuit résonnant (13) connecté entre la deuxième borne (2) et la quatrième borne (4) ; et un quatrième circuit résonnant (14) connecté entre la troisième borne (3) et la quatrième borne (4).
PCT/JP2020/010445 2020-03-11 2020-03-11 Circuit de découplage WO2021181546A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021564108A JP7026869B2 (ja) 2020-03-11 2020-03-11 減結合回路
PCT/JP2020/010445 WO2021181546A1 (fr) 2020-03-11 2020-03-11 Circuit de découplage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/010445 WO2021181546A1 (fr) 2020-03-11 2020-03-11 Circuit de découplage

Publications (1)

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WO2021181546A1 true WO2021181546A1 (fr) 2021-09-16

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010061541A1 (fr) * 2008-11-25 2010-06-03 パナソニック株式会社 Dispositif d'antenne réseau et dispositif de communication sans fil
JP2013172172A (ja) * 2012-02-17 2013-09-02 Mitsubishi Electric Corp 減結合回路
JP2014509484A (ja) * 2011-01-31 2014-04-17 ナン，チャンギ マルチモード高周波モジュール
US20140159986A1 (en) * 2012-12-06 2014-06-12 Microsoft Corporation Reconfigurable multiband antenna decoupling networks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010061541A1 (fr) * 2008-11-25 2010-06-03 パナソニック株式会社 Dispositif d'antenne réseau et dispositif de communication sans fil
JP2014509484A (ja) * 2011-01-31 2014-04-17 ナン，チャンギ マルチモード高周波モジュール
JP2013172172A (ja) * 2012-02-17 2013-09-02 Mitsubishi Electric Corp 減結合回路
US20140159986A1 (en) * 2012-12-06 2014-06-12 Microsoft Corporation Reconfigurable multiband antenna decoupling networks

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JP7026869B2 (ja) 2022-02-28

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