WO2015156056A1 - Élément de circuit non réciproque et module haute fréquence - Google Patents

Élément de circuit non réciproque et module haute fréquence Download PDF

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Publication number
WO2015156056A1
WO2015156056A1 PCT/JP2015/055951 JP2015055951W WO2015156056A1 WO 2015156056 A1 WO2015156056 A1 WO 2015156056A1 JP 2015055951 W JP2015055951 W JP 2015055951W WO 2015156056 A1 WO2015156056 A1 WO 2015156056A1
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port
input
antenna
output port
center electrode
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PCT/JP2015/055951
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English (en)
Japanese (ja)
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裕亮 楠本
和田　貴也
礼滋 中嶋
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株式会社村田製作所
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Publication of WO2015156056A1 publication Critical patent/WO2015156056A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/38—Circulators
    • H01P1/383—Junction circulators, e.g. Y-circulators
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Definitions

  • the present invention relates to a nonreciprocal circuit device, and more particularly to a nonreciprocal circuit device such as a circulator used in a microwave band and a high-frequency module including the nonreciprocal circuit device.
  • This type of circulator is a three-port lumped constant type circulator, and the center electrodes L1, L2, L3 are arranged on one surface of the ferrite 10 so as to cross each other in an electrically insulated state.
  • the operating frequency is adjusted by the capacitance values of the capacitors C1, C2, and C3 arranged in parallel with the center electrodes L1, L2, and L3.
  • the high frequency signal input from the port P1 (TX) is transmitted to the port P2 (ANT), and the high frequency signal input from the port P2 (ANT) is transmitted to the port P3 (RX).
  • the isolation characteristics between the ports P1 and P3 depend on the tensor permeability of the ferrite 10 and the port impedances of the ports P1 and P3.
  • the isolation characteristic between the ports P1 and P3 also depends on the magnetic coupling A between the center electrodes L1 and L3. Since the center electrodes L1 and L3 are arranged adjacent to each other on the ferrite 10, it is difficult to obtain a large value of isolation characteristics in a wide frequency band.
  • the impedance of the antenna may vary depending on the environment around the antenna, and if such a variation in impedance occurs, the isolation characteristic from the transmission port TX to the reception port RX is greatly deteriorated. Has occurred.
  • the nonreciprocal circuit device is With ferrite, First, second, third, and fourth center electrodes, each of which is arranged to be wound around the ferrite in at least one turn in an insulated state, and each one end of which is connected to the ground, A first matching capacitor element connected to each of the other ends of the first, second and third center electrodes and connected to the ground; Between the other end of the first center electrode and the first input / output port, between the other end of the second center electrode and the second input / output port, and between the other end of the third center electrode and the third input A second matching capacitor element connected to the output port; It is provided with.
  • the high-frequency module according to the second aspect of the present invention is The non-reciprocal circuit device according to the first form is provided,
  • the first input / output port is a transmission port, the second input / output port is an antenna port, and the third input / output port is a reception port; It is characterized by.
  • the first, second, and third center electrodes are each wound at least one turn around the ferrite, so that the impedance is increased, and the insertion loss and the isolation characteristics are reduced. Broadband.
  • the isolation characteristic between the other end portions (ports) between two other center electrodes facing each other across the fourth center electrode is improved over a wide band.
  • the non-reciprocal circuit device is With ferrite, First, second, third, and fourth center electrodes, each of which is arranged to be wound around the ferrite in at least one turn in an insulated state, and each one end of which is connected to the ground, A first matching capacitor element connected to the other end of each of the first, second, third and fourth center electrodes and connected to the ground; Between the other end of the first center electrode and the first input / output port, between the other end of the second center electrode and the second input / output port, and the other end of the third center electrode and the third input / output port And a second matching capacitor element connected between the other end of the fourth center electrode and the fourth input / output port, It is provided with.
  • the high-frequency module according to the fourth aspect of the present invention is A non-reciprocal circuit device according to the third embodiment;
  • the first input / output port is a transmission port, the second input / output port is a first antenna port, the third input / output port is a second antenna port, and the fourth input / output port is a reception port. , It is characterized by.
  • the first, second, third, and fourth center electrodes are each wound at least one turn around the ferrite, so that the impedance is increased, and the insertion loss and the isolator are isolated.
  • Broadband characteristics In particular, if the second input / output port is the first antenna port and the third input / output port is the second antenna port, even if the impedance of the first or second antenna fluctuates, the signal is received from the transmission port. There is almost no deterioration in the isolation characteristics of the port.
  • the nonreciprocal circuit device is With ferrite, First, second, third, and fourth center electrodes, each of which is arranged to be wound around the ferrite in at least one turn in an insulated state, and each one end of which is connected to the ground, A first matching capacitor element connected to the other end of each of the first, second and fourth center electrodes and connected to the ground; Between the other end of the first center electrode and the first input / output port, between the other end of the second center electrode and the second input / output port, and between the other end of the fourth center electrode and the fourth input A second matching capacitor element connected to the output port; A resistance element connected to the other end of the third center electrode and connected to the ground; A filter having a fixed or variable pass characteristic connected between the other end of the third center electrode and the resistance element; It is provided with.
  • the high-frequency module according to the sixth aspect of the present invention is A nonreciprocal circuit device according to the fifth embodiment;
  • the first input / output port is a transmission port, the second input / output port is an antenna port, and the fourth input / output port is a reception port; It is characterized by.
  • the first, second, third, and fourth center electrodes are wound around the ferrite for at least one turn, so that the impedance is increased, and the insertion loss and the isolator are isolated.
  • Broadband characteristics In particular, if the first input / output port is a transmission port, the second input / output port is an antenna port, and the fourth input / output port is a reception port, even if the impedance of the antenna fluctuates, The isolation characteristic from the port to the receiving port hardly deteriorates.
  • the present invention it is possible to obtain a large isolation characteristic in a wide band, and it is possible to prevent deterioration of the isolation characteristic even if the impedance of the antenna fluctuates.
  • the nonreciprocal circuit device 1A is configured as a 4-port type lumped constant circulator as shown in the equivalent circuit of FIG. 1st, 2nd, 3rd, 4th center electrode L1, L2, L3, L4 which is arrange
  • a resistance element R connected to the ground (fourth input / output port P4) is connected to the other end of the fourth center electrode L4.
  • the first matching capacitor elements C1, C2, and C3 connected to the ground are connected to the other ends of the first, second, and third center electrodes L1, L2, and L3, respectively. Further, between the other end of the first center electrode L1 and the first input / output port P1 (transmission port TX), the other end of the second center electrode L2 and the second input / output port P2 (antenna port ANT). And second matching capacitor elements CS1, CS2 and CS3 are connected between the other end of the third center electrode L3 and the third input / output port P3 (receiving port RX), respectively. Yes.
  • One end portions of the first, second, third, and fourth center electrodes L1, L2, L3, and L4 are connected to the ground GND through a series resonance circuit including an inductance element L11 and a capacitor element C11. .
  • This series resonant circuit is not always necessary.
  • the center electrodes L1, L2, L3, and L4 are formed of a conductor pattern wound around the upper and lower surfaces of the rectangular ferrite 10, as shown in FIG.
  • the first center electrode L1 includes conductor patterns 31 and 33 provided on the top surface of the ferrite 10, a conductor pattern 32 provided on the bottom surface, and interlayer conductors 34a and 34b provided on the side surfaces.
  • One end is connected to the port P1
  • the other end of the conductor pattern 31 is connected to one end of the conductor pattern 32 via the interlayer conductor 34a
  • the other end of the conductor pattern 32 is connected to one end of the conductor pattern 33 via the interlayer conductor 34b. Is done.
  • the other end of the conductor pattern 33 is connected to the ground GND.
  • the second center electrode L2 includes conductor patterns 41 and 43 provided on the upper surface, a conductor pattern 42 provided on the lower surface, and interlayer conductors 44a and 44b provided on the side surfaces, and one end of the conductor pattern 41 is connected to the port P2.
  • the other end of the conductor pattern 41 is connected to one end of the conductor pattern 42 via the interlayer conductor 44a, and the other end of the conductor pattern 42 is connected to one end of the conductor pattern 43 via the interlayer conductor 44b.
  • the other end of the conductor pattern 43 is connected to the ground GND.
  • the third center electrode L3 includes conductor patterns 51 and 53 provided on the upper surface, a conductor pattern 52 provided on the lower surface, and interlayer conductors 54a and 54b provided on the side surfaces, and one end of the conductor pattern 51 is connected to the port P3.
  • the other end of the conductor pattern 51 is connected to one end of the conductor pattern 52 via the interlayer conductor 54a, and the other end of the conductor pattern 52 is connected to one end of the conductor pattern 53 via the interlayer conductor 54b.
  • the other end of the conductor pattern 53 is connected to the ground GND.
  • the fourth center electrode L4 includes conductor patterns 61 and 63 provided on the upper surface, a conductor pattern 62 provided on the lower surface, and interlayer conductors 64a and 64b provided on the side surfaces.
  • the other end of the conductor pattern 61 is connected to one end of the conductor pattern 62 via the interlayer conductor 64a, and the other end of the conductor pattern 62 is connected to one end of the conductor pattern 63 via the interlayer conductor 64b. ing. The other end of the conductor pattern 63 is connected to the ground GND.
  • one turn in which the center electrodes L1 to L4 are wound around the ferrite 10 means a state where the ferrite 10 is wound once. However, it is sufficient that the winding is substantially performed.
  • at the center electrode L1, at least the pattern 31, the interlayer conductor 34a, and the pattern 32 are referred to as one turn.
  • the operation of the 4-port type circulator having the above configuration is basically the same as that of the conventional 3-port type, and the high-frequency signal input from the first input / output port P1 (transmission port TX) is the second.
  • a high-frequency signal output from the input / output port P2 (antenna port ANT) and input from the second input / output port P2 (antenna port ANT) is output from the third input / output port P3 (reception port RX).
  • the first matching capacitor elements C1, C2, and C3 form part of different parallel resonance circuits with the first, second, and third center electrodes L1, L2, and L3, respectively (inductance element L11 and capacitor element C11).
  • the operation frequency is adjusted according to each capacitance value.
  • the first, second, and third center electrodes L1, L2, and L3 are wound around the ferrite 10 by 1.5 turns, respectively, and the insertion loss and isolation characteristics are broadened by increasing the impedance.
  • the second matching capacitor element CS1 is inserted between the first input / output port P1 (transmission port TX) and the first center electrode L1, and the second input / output port P2 (antenna port ANT) and the second input
  • the second matching capacitor element CS2 is inserted between the center electrode L2 and the second matching capacitor element CS3 is inserted between the third input / output port P3 (reception port RX) and the third center electrode L3.
  • the impedances of the ports P1, P2, and P3 can be easily adjusted by the capacitance values of the second matching capacitors CS1, CS2, and CS3, and deterioration of insertion loss in the operating frequency band as a circulator can be suppressed. .
  • center electrode L1, L2, L3 improves. Furthermore, by adjusting the inductance values of the center electrodes L1, L2, and L3 and the capacitance values of the first matching capacitor elements C1, C2, and C3, the attenuation amount of the insertion loss characteristic and the isolation characteristic can be freely adjusted in the operating frequency band. Can be designed.
  • FIG. 3 shows the isolation characteristics between ports P3 and P1 (see solid line) and the isolation characteristics between ports P1 and P3 (see dotted line).
  • the first center electrode L1 and the third center electrode L3 are opposed to each other, and are opposite to each other with the ground GND side as an end point (arrows a, a ').
  • the second center electrode L2 and the fourth center electrode L4 face each other and are wound in opposite directions (see b and b ′) with the ground GND side as an end point.
  • the first center electrode L1 and the third center electrode L3 are arranged in parallel to each other, the second center electrode L2 and the fourth center electrode L4 are arranged in parallel to each other, and the first and third center electrodes L1 and L3 and the second and fourth center electrodes L2 and L4 intersect each other at 90 °.
  • the opposing first center electrode L1 and third central electrode L3 are wound in opposite directions, and the opposing second center electrode L2 and fourth center electrode L4 are wound in opposite directions. Therefore, as shown in FIG. 4A, the insertion loss characteristic and the isolation characteristic between the ports P1 and P2 show good characteristics over a wide band.
  • the first center electrode L1 and the third center electrode L3 facing each other are wound in the same direction, and the second center electrode L2 and the fourth center electrode L4 facing each other are wound in the same direction.
  • the insertion loss characteristic and the isolation characteristic between the port P1 and the port P2 are as shown in FIG. 4B, and irreversibility cannot be obtained.
  • the irreversible circuit element 1A can simultaneously support a plurality of frequency bands used for wireless communication.
  • FIG. 5 shows a block diagram of a high-frequency module for a mobile phone including the nonreciprocal circuit element 1A.
  • the first input / output port P1 transmission port TX
  • the second input / output port P ⁇ b> 2 is connected to the antenna 84.
  • the third input / output port P3 (reception port RX) is connected to the reception filter 85 and further connected to the reception circuit 86.
  • the transmission signal output from the transmission circuit 83 is input to the antenna 84 from the nonreciprocal circuit element 1A. Then, the transmission signal reflected by the antenna 84 is reflected again by the reception filter 85, and this re-reflection signal is absorbed by the fourth input / output port P4 (resistive element R).
  • the reception signal input from the antenna 84 is input from the third input / output port P3 to the reception circuit 86 via the reception filter 85.
  • the nonreciprocal circuit device 1B has basically the same configuration as that of the first embodiment, and the first center electrode L1, counterclockwise in the drawing, A second center electrode L2, a third center electrode L3, and a fourth center electrode L4 are disposed.
  • the difference is that instead of the resistor element R, the first matching capacitor element C4 and the second matching capacitor element CS4 are connected to the other end of the fourth center electrode L4.
  • the second input / output port P2 which is the other end of the second center electrode L2 is an antenna port ANT1, and the third input / output port P3 which is the other end of the third center electrode L3 is a second antenna port. ANT2.
  • the fourth input / output port P4, which is the other end of the fourth center electrode L4, is a reception port RX.
  • the operation of the second embodiment is basically the same as that of the first embodiment, but the antenna connected to the antenna port ANT1 functions as a transmission-dedicated antenna, and is connected to the second antenna port ANT2.
  • the connected antenna functions as a transmission / reception antenna. That is, the high-frequency signal input from the first input / output port P1 (transmission port TX) is output from the second input / output port P2 (antenna port ANT1). On the other hand, a high-frequency signal input from the third input / output port P3 (second antenna port ANT2) is output from the fourth input / output port P4 (reception port RX).
  • the impedance changes, and a high-frequency signal input from the transmission port TX Is reflected by the transmission-dedicated antenna.
  • the second antenna port ANT2 is provided between the antenna port ANT1 and the reception port RX, the high frequency signal reflected by the transmission dedicated antenna is connected to the port P3 (ANT2). Output from the transmitting / receiving antenna. For this reason, it is possible to prevent the high frequency signal input from the transmission port TX from leaking to the reception port RX due to the impedance variation of the antenna connected to the antenna port ANT1, and the isolation between the ports P1 and P4 from deteriorating. Can do.
  • FIG. 7A when the voltage standing wave ratio (VSWR) of the transmission-dedicated antenna connected to the antenna port ANT1 is 3, the antenna impedance is a, b, c, d
  • FIG. 7B shows a change in isolation between the ports P1 to P4 (TX-RX) when changed to e and f
  • FIG. 7C shows the isolation characteristic between the ports P1-P3 (TX-RX) when the impedance in the conventional example shown in FIG. 16 changes from a to f.
  • an isolation characteristic of ⁇ 15 dB or more is obtained in the frequency band of 699 to 960 MHz.
  • the second antenna port ANT2 is not provided between the receiving port RX and the receiving port RX, it is greatly deteriorated.
  • the antenna connected to the antenna port ANT1 may correspond to the transmission signal and the reception signal, and the antenna connected to the second antenna port ANT2 may correspond to only the transmission signal.
  • the antenna 105 connected to the antenna port ANT1 is vertically arranged on the top of the housing 101, and the antenna 106 connected to the second antenna port ANT2 is placed in the housing 101.
  • a surface-mounted antenna 121 is disposed as a first antenna on a circuit board 110 provided with a ground electrode 111, and a whip antenna 122 is disposed as a second antenna. It may be arranged.
  • the surface-mounted antenna 121 is mounted such that the open end of the radiation electrode faces downward, so that the open end is kept away from the whip antenna 122.
  • the surface-mounted antenna 121 is mounted so that the open end of the radiation electrode faces the outside of the mobile terminal 100, so that the open end is kept away from the whip antenna 122. Yes. In any arrangement example, mutual interference between the surface-mounted antenna 121 and the whip antenna 122 is prevented.
  • the impedance of the first antenna and the second antenna can be changed due to environmental changes at the same time. Can be avoided.
  • the nonreciprocal circuit device 1C according to the third embodiment has basically the same configuration as that of the second embodiment (see FIG. 6).
  • These antennas correspond to both transmission signals and reception signals, and a filter F is inserted between the other end of the third center electrode L3 and the port P3.
  • the filter F may have either a fixed or variable pass characteristic.
  • the filter F passes a high-frequency signal input from the transmission port TX and reflected by the first antenna, and reflects a received signal of the first antenna. Has filter characteristics.
  • a high-frequency signal input from the first input / output port P1 (transmission port TX) is output from the second input / output port P2 (antenna port ANT1).
  • This transmission signal is selected from a plurality of frequency bands according to need.
  • the received signal input from the antenna connected to the port P2 (ANT1) is reflected by the filter F and input to the port P4 (receiving port RX).
  • the 2nd antenna should just respond
  • the nonreciprocal circuit device 1D As shown in FIG. 11, the nonreciprocal circuit device 1D according to the fourth embodiment basically has the same configuration as that of the third embodiment (see FIG. 10).
  • the resistance element R dropped to the ground is connected to the other end of the center electrode L3 through the filter F. Therefore, the port P3 is a termination, and the antenna port is only the port P2.
  • the filter F may have either a fixed or variable pass characteristic, and passes a high-frequency signal input from the transmission port TX and reflected by the antenna, It has a filter characteristic to reflect.
  • the antenna is compatible with both transmission signals and reception signals.
  • a high-frequency signal input from the first input / output port P1 (transmission port TX) is output from the second input / output port P2 (antenna port ANT).
  • the transmission signal is selected from a plurality of frequency bands as required.
  • the received signal input from the antenna connected to the port P2 is reflected by the filter F and input to the port P4 (receiving port RX).
  • FIG. 12 shows a block diagram of a high-frequency module constituting a front-end circuit including the nonreciprocal circuit element 1D.
  • the first input / output port P1 (transmission port TX) is connected to the transmission circuit 83 via the power amplifier 82.
  • the second input / output port P ⁇ b> 2 (antenna port ANT) is connected to the antenna 84.
  • the third input / output port P3 is connected to the other end of the third center electrode L3 via the filter F and the resistance element R.
  • the fourth input / output port P4 (reception port RX) is connected to the reception circuit 86.
  • filters may be arranged between the first input / output port P1 and the power amplifier 82 and between the fourth input / output port P4 and the receiving circuit 86.
  • the transmission signal output from the transmission circuit 83 is input to the antenna 84 from the first input / output port P1. Then, the transmission signal reflected by the antenna 84 passes through the filter F and is absorbed by the resistance element R. The reception signal input from the antenna 84 is reflected by the filter F and input to the reception circuit 86 from the fourth input / output port P4.
  • FIG. 13 when the voltage standing wave ratio (VSWR) of the antenna 84 is 3 as in FIG. 7B, the impedance of the antenna changes to a, b, c, d, e, f.
  • the change in isolation between ports P1-P4 (TX-RX) is shown.
  • a conventional example to be compared is FIG. 7C, and in the band of 699 to 960 MHz, the isolation characteristic of -15 dB or more is obtained in the example of the present invention.
  • FIG. 14A shows the change in the adjustment.
  • FIG. 14B shows a similar change in isolation in the conventional example shown in FIG.
  • the isolation characteristics of the example of the present invention are greatly improved at any impedance compared to the conventional example.
  • the isolation is ⁇ 7.3 to ⁇ 8.3 dB in the conventional example, whereas it is ⁇ 15.4 to ⁇ 19.7 dB in the example of the present invention.
  • the isolation characteristics of the present invention are not significantly deteriorated as compared with the conventional example. Therefore, even when the VSWR varies, by using the configuration of the present invention example, excellent isolation characteristics between TX and RX can be obtained over a wide frequency band.
  • the other multi-port device 2 is, for example, a CMOS duplexer using a transformer.
  • the transmission signal reflected by the load fluctuation of the antenna 84 can be absorbed by the resistance element R (may be a variable resistance element), and the reflected signal is transmitted to the reception circuit 86 side. It can prevent wrapping around. As a result, similar to the non-reciprocal circuit element, an effect of preventing deterioration of isolation between transmission and reception can be obtained.
  • the nonreciprocal circuit device and the high frequency module according to the present invention are not limited to the above-described embodiments, and can be variously modified within the scope of the gist thereof.
  • the specific shape of the center electrode is arbitrary.
  • the matching capacitor element may be built in the circuit board or may be mounted on the circuit board as a chip type.
  • the present invention is useful for non-reciprocal circuit elements and high-frequency modules. Particularly, a large value of isolation characteristics can be obtained in a wide band, and even if the impedance of the antenna fluctuates, the isolation characteristics can be obtained. It is excellent in that deterioration can be prevented.
  • Non-reciprocal circuit element (circulator) DESCRIPTION OF SYMBOLS 10 ... Ferrite 81 ... Transmission filter 83 ... Transmission circuit 84 ... Antenna 85 ... Reception filter 86 ... Reception circuit 100 ... Portable terminal 105,106 ... Antenna 121 ... Surface mount type antenna 122 ... Whip antenna L1-L4 ... Center electrode C1-C4 ... Capacitor elements CS1 to CS4 ... Capacitor elements R, R1 to R3 ... Resistance elements F ... Filters P1 to P4 ... Ports

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

Cette invention concerne un élément de circuit non réciproque permettant d'obtenir des propriétés d'isolation de haute valeur sur une plage étendue. Ledit élément de circuit non réciproque comprend : de la ferrite (10); des première, deuxième, troisième et quatrième électrodes centrales (L1, L2, L3, L4) qui sont disposées de manière enroulée sur au moins un tour sur la ferrite (10), qui sont toutes à l'état isolé et dont chacune a une extrémité connectée à une masse; de premiers éléments de condensateur associés (C1, C2, C3) qui sont reliés à l'autre extrémité des première, deuxième et troisième électrodes centrales (L1, L2, L3), respectivement, et sont connectés à une masse; et de seconds éléments de condensateur associés (CS1, CS2, CS3) qui sont connectés entre l'autre extrémité de la première électrode centrale (L1) et un premier port E/S (P1), l'autre extrémité de la deuxième électrode centrale (L2) et un deuxième port E/S (P2), et l'autre extrémité de la troisième électrode centrale (L3) et un troisième port E/S (P3), respectivement.
PCT/JP2015/055951 2014-04-09 2015-02-27 Élément de circuit non réciproque et module haute fréquence WO2015156056A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2014-080349 2014-04-09
JP2014080349 2014-04-09
JP2014-201338 2014-09-30
JP2014201338 2014-09-30
JP2015054252 2015-02-17
JPPCT/JP2015/054252 2015-02-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017150619A1 (fr) * 2016-03-03 2017-09-08 株式会社村田製作所 Élément de circuit irréversible, circuit frontal et dispositif de communication
WO2023282808A1 (fr) * 2021-07-08 2023-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Topologie de filtre électrique améliorée

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0384611U (fr) * 1989-12-18 1991-08-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0384611U (fr) * 1989-12-18 1991-08-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017150619A1 (fr) * 2016-03-03 2017-09-08 株式会社村田製作所 Élément de circuit irréversible, circuit frontal et dispositif de communication
WO2023282808A1 (fr) * 2021-07-08 2023-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Topologie de filtre électrique améliorée

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