WO2012172909A1 - 分波器 - Google Patents
分波器 Download PDFInfo
- Publication number
- WO2012172909A1 WO2012172909A1 PCT/JP2012/062503 JP2012062503W WO2012172909A1 WO 2012172909 A1 WO2012172909 A1 WO 2012172909A1 JP 2012062503 W JP2012062503 W JP 2012062503W WO 2012172909 A1 WO2012172909 A1 WO 2012172909A1
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- WIPO (PCT)
- Prior art keywords
- filter
- band
- elastic wave
- pass filter
- wave trap
- Prior art date
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H7/463—Duplexers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6406—Filters characterised by a particular frequency characteristic
- H03H9/6409—SAW notch filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/72—Networks using surface acoustic waves
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- 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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
Definitions
- the present invention relates to a duplexer that demultiplexes a plurality of signals having different pass bands, and more particularly to a duplexer in which a high-pass filter including a low-pass filter and an LC filter is connected to an antenna terminal.
- Patent Document 1 discloses a diplexer in which a high-pass filter and a low-pass filter are connected in parallel to an antenna terminal.
- the high-pass filter passes the transmission / reception signal in the high frequency band and attenuates the transmission / reception signal in the low frequency band.
- the low-pass filter passes a low-frequency transmission / reception signal and attenuates a high-frequency transmission / reception signal.
- each of the high-pass filter and the low-pass filter is configured by an LC filter including an inductor and a capacitor.
- the following demultiplexing circuit is connected to the antenna circuit.
- the branching circuit includes a low-pass filter that extracts a high-frequency signal in a first frequency band, a mid-pass filter circuit that extracts a high-frequency signal in a second frequency band higher than the first frequency band, and a second frequency band. And a high-pass filter that extracts a high-frequency signal in the third frequency band that is higher.
- Each of the low-pass filter, the mid filter, and the high-pass filter is configured by an LC filter including an inductor and a capacitor.
- Patent Document 2 discloses a circuit configuration in which a duplexer composed of a surface acoustic wave filter is further connected to these filters.
- Patent Document 3 discloses a multiband antenna switch circuit in which a diplexer is connected to an antenna terminal, and a notch filter is further connected to the diplexer.
- the diplexer has a low-pass filter and a high-pass filter.
- Each of the high-pass filter and the low-pass filter is configured by an LC filter including an inductor and a capacitor.
- the notch filter is also composed of an LC filter.
- the low-pass filter and the high-pass filter are composed of LC filters.
- the notch filter and the like are also composed of LC filters. For this reason, it has been difficult to increase the steepness of the filter characteristics.
- An object of the present invention is to provide a low-pass filter and a high-pass filter, and to form a stop band excellent in steepness without increasing the number of parts and without increasing the size in the pass band of the high-pass filter. It is to provide a duplexer that is possible.
- the duplexer includes an antenna terminal, a first receiving terminal and a second receiving terminal, and a low pass filter connected between the antenna terminal and the first receiving terminal and having a first passband. And a high-pass filter having a second pass band that is connected between the antenna terminal and the second receiving terminal and located on a higher frequency side than the first pass band, and in the second pass band And an elastic wave trap filter having a stop band whose frequency width is narrower than that of the second pass band.
- the elastic wave trap filter is connected in series to a high-pass filter. Therefore, a narrow stop band by the elastic wave trap filter can be reliably formed in the pass band of the high pass filter.
- the real part of the input side impedance is smaller than 50 ⁇ and the imaginary part is 0 within the frequency range of the stop band.
- the input side impedance of the elastic wave trap filter in the vicinity of the stop band can be reduced. Therefore, it becomes difficult for a signal having a frequency in the stop band of the elastic wave trap filter to flow to the low-pass filter side to which the elastic wave trap filter is not connected. Therefore, an attenuation pole appears in the frequency range corresponding to the stop band on the low-pass filter side.
- the elastic wave trap filter includes a series arm connecting the input end and the output end, and a plurality of parallel connections connected between the series arm and the ground potential.
- a ladder-type circuit configuration having an arm, a plurality of inductors connected in series to the series arm, and a plurality of parallel resonators respectively connected to the plurality of parallel arms, the first stage on the input end side being It is a parallel arm resonator. In this case, the input impedance in the stop band of the elastic wave trap filter can be reduced.
- the elastic wave trap filter is connected between an antenna terminal of the duplexer and the high-pass filter.
- the elastic wave trap filter having a stop band located in the second pass band formed by the high pass filter is connected in series to the high pass filter, so that the second A narrow stop band can be formed in the pass band.
- the stop band is formed by the elastic wave trap filter, it is possible to form a stop band having excellent steepness without increasing the number of components and increasing the size.
- FIG. 1 is a circuit diagram of a duplexer according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram of an elastic wave trap filter used in the duplexer of FIG.
- FIG. 3 is a diagram showing pass characteristics on the low-pass filter side in the duplexer of the embodiment shown in FIG.
- FIG. 4 is a diagram showing the pass characteristics on the high-pass filter side in the duplexer of the embodiment shown in FIG.
- FIG. 5 is a diagram showing an impedance Smith chart of the elastic wave trap filter used in the embodiment shown in FIG.
- FIG. 6 is a circuit diagram showing a modification of the elastic wave trap filter used in the duplexer of the present invention.
- FIG. 7 is a diagram showing an impedance Smith chart of the elastic wave trap filter shown in FIG. FIG.
- FIG. 8 is a diagram showing the pass characteristic on the low-pass filter side in the duplexer of another embodiment of the present invention using the elastic wave trap filter shown in FIG.
- FIG. 9 is a diagram showing the pass characteristic on the high-pass filter side in the duplexer of another embodiment of the present invention using the elastic wave trap filter shown in FIG.
- FIG. 1 is a circuit diagram of a duplexer according to an embodiment of the present invention.
- a mobile phone equipped with a one-segment tuner receive digital terrestrial broadcasting (ISDB-T) in the UHF band, particularly in the 470 to 710 MHz band.
- ISDB-T digital terrestrial broadcasting
- the VHF band that is, 207.5 to 220 MHz
- ISDB-Tmm terrestrial digital broadcasting
- the antenna is shared between ISDB-T and ISDB-Tmm. Therefore, when receiving a plurality of terrestrial digital broadcasts having different frequency bands, such as ISDB-T and ISDB-Tmm, a demultiplexer for demultiplexing a plurality of reception band signals input from the same antenna is required. .
- a transmission band signal of the mobile communication system that is, a signal of 830 to 845 MHz becomes an interference wave. Therefore, it is necessary to remove the transmission band signal, that is, the Tx band signal in the duplexer that demultiplexes the reception band signals of ISDB-T and ISDB-Tmm.
- the duplexer 1 of the present embodiment passes the ISDB-Tmm reception band signal and passes the ISDB-T reception band signal, and the low-pass filter 2 that attenuates the ISDB-T reception band signal. And a high-pass filter 3 for attenuating the received band signal. That is, the low pass filter 2 is a band filter having a pass band (first pass band) of 207.5 to 220 MHz, and the high pass filter 3 is a band having a pass band (second pass band) of 470 to 710 MHz. It is a filter.
- One end of the low-pass filter 2 is connected to the antenna terminal 4.
- the other end of the low-pass filter 2 is connected to the first reception terminal 5. That is, the low pass filter 2 is connected between the antenna terminal 4 and the first receiving terminal 5.
- the high-pass filter 3 is connected to the antenna terminal 4.
- the other end of the high pass filter 3 is connected to one end of the elastic wave trap filter 6.
- the other end of the elastic wave trap filter 6 is connected to the second receiving terminal 7. That is, the high pass filter 3 and the elastic wave trap filter 6 are connected in series between the antenna terminal 4 and the second receiving terminal 7.
- the elastic wave trap filter 6 is located in the pass band of the high pass filter 3 and has a transmission band of the mobile communication system having a narrower bandwidth than the pass band of the high pass filter 3, that is, a trap filter having a Tx band as a stop band. It is.
- the low-pass filter 2 has a plurality of inductors L1 to L3 connected in series with each other at a series arm connecting the antenna terminal 4 and the first receiving terminal 5.
- a capacitor C1 is connected between the connection point of the inductor L2 and the inductor L3 and the ground potential. That is, the low pass filter 2 is an LC filter including a plurality of inductors L1 to L3 and a capacitor C1.
- the high-pass filter 3 is connected between the capacitor C2 connected to the series arm connecting the antenna terminal 4 and the elastic wave trap filter 6, and the end of the capacitor C2 opposite to the antenna terminal 4 and the ground potential. Inductor L4. Therefore, the high-pass filter 3 is also an LC filter having a capacitor C2 and an inductor L4.
- the feature of this embodiment is that a stop band having a frequency width narrower than that of the high-pass filter 3 is formed in the pass band of the high-pass filter 3 by the elastic wave trap filter 6.
- the circuit configuration of the elastic wave trap filter 6 is shown in FIG.
- the elastic wave trap filter 6 has a ladder-type circuit configuration. More specifically, a plurality of inductors L5 to L7 are connected in series with each other in a series arm connecting the input end 6a and the output end 6b.
- An elastic wave resonator P1 is connected between the input terminal 6a and the ground potential.
- the acoustic wave resonator P2 is connected between the connection point between the inductor L5 and the inductor L6 and the ground potential.
- the acoustic wave resonator P3 is connected between the connection point between the inductor L6 and the inductor L7 and the ground potential.
- An elastic wave resonator P4 is connected between the output terminal 6b and the ground potential.
- the elastic wave trap filter 6 has a ladder circuit configuration, and a plurality of parallel arms have elastic wave resonators P1 to P4, respectively. Therefore, it is excellent in the steepness of the trap characteristic as compared with the LC filter. Therefore, a stop band having a steep filter characteristic, that is, a trap band can be formed in the pass band of the high-pass filter 3 to which the elastic wave trap filter 6 is connected in series.
- acoustic wave resonators P1 to P4 which are surface acoustic wave resonators having an IDT (interdigital transducer) and two reflectors arranged on both sides thereof, were formed.
- the resonance frequencies of the acoustic wave resonators P1 to P3 are located in the Tx band (830 to 845 MHz) of the mobile communication system.
- Inductor L1 has an inductance of 12 nH
- inductor L2 has an inductance of 16 nH
- inductor L3 has an inductance of 19 nH.
- FIG. 3 is a diagram showing the pass characteristic at the first receiving terminal 5 in the duplexer 1 of the present embodiment produced according to the above specifications, that is, the pass characteristic of the low-pass filter 2.
- FIG. 4 shows the pass characteristic of the second receiving terminal 7 in the duplexer 1.
- the frequency band used by ISDB-T is indicated by A with hatching.
- the high-pass filter 3 has a very small insertion loss in the frequency band A of ISDB-T.
- the high pass filter 3 itself attenuates a signal of about 330 MHz or less and passes a signal higher than about 330 MHz.
- the elastic wave trap filter 6 forms a stop band in the pass band of the high pass filter 3. That is, the elastic wave trap filter 6 has a trap characteristic having an attenuation pole with a large attenuation near 837 MHz. 3 and 4, the Tx band (830 to 845 MHz) of the mobile communication system is denoted by B. As is apparent from FIG. 4, a filter characteristic having a small insertion loss in the frequency band A of ISDB-T and a large attenuation in the Tx band B is obtained.
- the attenuation is 1.5 dB near 710 MHz, while the attenuation is significantly increased to 51 dB at 830 MHz.
- the elastic wave trap filter 6 is provided in the Tx band B in order to secure an attenuation amount on the second receiving terminal 7 side.
- the elastic wave trap filter 6 is superior in the steepness of the trap characteristic. Therefore, as shown in FIG. 4, the Tx band B signal can be selectively attenuated at the second receiving terminal 7. Therefore, since the signal in the Tx band B does not become an interference wave, the signal in the frequency band A of ISDB-T can be received well.
- the elastic wave trap filter 6 since the elastic wave trap filter 6 is connected to the high-pass filter 3 side, almost no insertion loss occurs in the pass band on the low-pass filter 2 side. That is, as shown in FIG. 3, the low-pass filter 2 greatly attenuates a signal of 400 MHz or higher.
- an attenuation pole indicated by an arrow C appears in the signal that can be extracted from the first receiving terminal 5 from which the signal of the low-pass filter 2 is extracted. Accordingly, the attenuation in the Tx band B can be increased also in the first receiving terminal 5. This is due to the circuit configuration of the elastic wave trap filter 6.
- the first stage on the input end 6a side is a parallel arm resonator having a resonance frequency in the Tx band B. Therefore, the input side impedance of the elastic wave trap filter 6 in the vicinity of the Tx band B can be easily reduced.
- FIG. FIG. 5 is an impedance Smith chart showing the S11 reflection characteristics of the elastic wave trap filter 6.
- the real part is smaller than 50 ⁇ and the imaginary part is 0 within the frequency range of the stop band (830 to 845 MHz). Therefore, the input side impedance can be reduced. Therefore, the Tx band B signal hardly flows to the low-pass filter 2 side to which the elastic wave trap filter 6 is not connected. Thereby, an attenuation pole indicated by an arrow C shown in FIG. 3 appears on the low-pass filter 2 side.
- the parallel arm resonator is connected to the resonator at the input side end, that is, the parallel arm resonator is connected to the input terminal. It is desirable that
- FIG. 6 is a circuit diagram showing an example of a preferred modification of the elastic wave trap filter.
- a plurality of series arm resonators S1 to S4 are connected in series with each other at the series arm connecting the input end 12 and the output end 13.
- the series arm resonators S1 to S4 are composed of surface acoustic wave resonators.
- the first parallel arm resonator P11 is connected between the input terminal 12 and the ground potential.
- a second parallel arm resonator P12 is connected between the connection point between the series arm resonators S1 and S2 and the ground potential.
- a third parallel arm resonator P13 is connected between the connection point between the series arm resonators S2 and S3 and the ground potential.
- a fourth parallel arm resonator P14 is connected between the connection point between the series arm resonators S3 and S4 and the ground potential.
- a fifth parallel arm resonator P15 is connected between the output terminal 13 and the ground potential.
- the first to fifth parallel arm resonators P11 to P15 are composed of surface acoustic wave resonators.
- an inductor L11 is connected between the input terminal 12 and the connection point between the series arm resonators S2 and S3. That is, the inductor L11 is connected in parallel to the series arm resonators S1 and S2.
- an inductor L12 is connected between the connection point between the series arm resonators S2 and S3 and the output end 13. That is, the inductor L12 is connected in parallel to the series arm resonators S3 and S4, and is connected in series to the inductor L11.
- the first stage resonator on the input end 12 side is the first parallel arm resonator P11 whose resonance frequency is located in the Tx band. Therefore, as in the above embodiment, the input-side impedance in the vicinity of the Tx band can be reduced.
- the series arm resonators S1 to S4 and the first to fifth parallel arm resonators P11 to P15 are designed as shown in Table 2 below.
- the inductors L11 and L12 each have a value of 10 nH.
- FIG. 7 is a view showing an S11 reflection characteristic impedance Smith chart of the elastic wave trap filter 11 having the above specifications.
- the point E where the real part is smaller than 50 ⁇ and the imaginary part is 0 exists in the stopband frequency range (830 to 845 MHz), as in the elastic wave trap filter 6 described above. . Therefore, the input side impedance can be reduced.
- the elastic wave trap filter 6 shown in FIG. 2 does not require a series arm resonator, the elastic wave trap filter 6 can be downsized as compared with the elastic wave trap filter 11.
- the stop band is formed by the elastic wave trap filter 6 or the elastic wave trap filter 11, so that the stop band of the Tx band is compared to the case where the LC filter is used.
- the steepness in can be effectively increased.
- the LC filter is increased in size and the number of parts.
- the duplexer of the present embodiment can form a steep stop band in the pass band of the high-pass filter without causing much increase in size and number of parts.
- the surface acoustic wave resonator is used for the elastic wave trap filter, but various elastic wave resonators such as a boundary acoustic wave resonator and a piezoelectric thin film resonator can be used.
- the duplexer that passes the ISDB-Tmm band signal at the first receiving terminal, passes the ISDB-T band signal at the second receiving terminal, and blocks the Tx band signal has been described.
- the first and second passbands in the invention are not limited to the specific frequency band.
- the duplexer according to the present invention is preferably used for a mobile phone provided with a communication system using the 800 to 900 MHz band, a communication system using the 2 GHz band, and a WLAN of 2.5 GHz band. it can.
- the high-pass filter may attenuate a signal of 1 GHz or lower
- the low-pass filter may attenuate a signal of 1.8 GHz or higher
- the trap filter may attenuate a signal in the 2.5 GHz band.
- the stop band formed in the second pass band having a relatively high frequency band is not limited to the Tx band in the above embodiment, and may be another frequency band.
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Abstract
Description
なお、本発明においては、相対的に周波数域が高い第2の通過帯域内に形成される阻止帯域についても、上記実施形態におけるTx帯に限らず、他の周波数帯域であってもよい。
2…ローパスフィルタ
3…ハイパスフィルタ
4…アンテナ端子
5…第1受信端子
6…弾性波トラップフィルタ
6a…入力端
6b…出力端
7…第2受信端子
11…弾性波トラップフィルタ
12…入力端
13…出力端
L1~L3,L5~L7,L11,L12…インダクタ
P1~P4…弾性波共振子
P11~P15…第1~第5の並列腕共振子
S1~S4…直列腕共振子
Claims (5)
- アンテナ端子と、
第1受信端子および第2受信端子と、
前記アンテナ端子と第1受信端子との間に接続されており、第1の通過帯域を有するローパスフィルタと、
前記アンテナ端子と第2受信端子との間に接続されており、前記第1の通過帯域よりも高周波側に位置する第2の通過帯域を有するハイパスフィルタと、
前記第2の通過帯域内に位置しており、前記第2の通過帯域よりも周波数幅が狭い阻止帯域を有する弾性波トラップフィルタとを備える、分波器。 - 前記弾性波トラップフィルタが、前記ハイパスフィルタに直列に接続されている、請求項1に記載の分波器。
- 前記弾性波トラップフィルタのインピーダンス特性において、前記阻止帯域の周波数範囲内に入力側インピーダンスの実部が50Ωよりも小さく、虚部が0となる点が存在する、請求項1または2に記載の分波器。
- 前記弾性波トラップフィルタが、入力端と出力端とを結ぶ直列腕と、直列腕とグラウンド電位との間に接続されている複数の並列腕と、直列腕に直列に接続されている複数のインダクタと、複数の並列腕にそれぞれ接続されている複数の並列共振子とを有するラダー型回路構成を有し、前記入力端側の初段が並列腕共振子である、請求項1~3のいずれか1項に記載の分波器。
- 前記弾性波トラップフィルタが、前記分波器のアンテナ端子と前記ハイパスフィルタとの間に接続されている、請求項1~4のいずれか1項に記載の分波器。
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JP2013520479A JP5673818B2 (ja) | 2011-06-17 | 2012-05-16 | 分波器 |
DE112012002502.4T DE112012002502B4 (de) | 2011-06-17 | 2012-05-16 | Demultiplexer |
CN201280027712.1A CN103597744B (zh) | 2011-06-17 | 2012-05-16 | 分波器 |
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JP2011-135092 | 2011-06-17 | ||
JP2011135092 | 2011-06-17 |
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JP (1) | JP5673818B2 (ja) |
CN (1) | CN103597744B (ja) |
DE (1) | DE112012002502B4 (ja) |
WO (1) | WO2012172909A1 (ja) |
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WO2014147925A1 (en) * | 2013-03-21 | 2014-09-25 | Sony Corporation | Television receiver, television broadcast receiving method and mobile terminal |
JPWO2015119178A1 (ja) * | 2014-02-10 | 2017-03-23 | 株式会社村田製作所 | 可変フィルタ回路および無線通信装置 |
CN109286387A (zh) * | 2017-07-21 | 2019-01-29 | 株式会社村田制作所 | 高频滤波器、多路复用器、高频前置电路以及通信装置 |
GB2613250A (en) * | 2018-07-18 | 2023-05-31 | Skyworks Solutions Inc | Parallel hybrid acoustic passive filter |
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TW201611552A (zh) | 2014-09-09 | 2016-03-16 | 鴻海精密工業股份有限公司 | 訊號分離電路及前端電路 |
KR102576845B1 (ko) * | 2015-06-03 | 2023-09-11 | 가부시키가이샤 와이솔재팬 | 탄성파 장치 |
DE112017001943T5 (de) * | 2016-04-08 | 2019-04-25 | Resonant Inc. | Funkfrequenzfilter, Triplexer hoher Selektivität und Kommunikationsvorrichtung |
CN110999081B (zh) * | 2017-07-25 | 2023-08-08 | 株式会社村田制作所 | 高频滤波器、多工器、高频前端电路以及通信装置 |
DE102018102832B4 (de) * | 2018-02-08 | 2023-01-05 | RF360 Europe GmbH | Filterschaltung mit einem Notchfilter |
DE102019108852B4 (de) * | 2019-04-04 | 2021-09-09 | RF360 Europe GmbH | Mikroakustisches Bandsperrfilter |
US11387556B2 (en) | 2019-04-05 | 2022-07-12 | Samsung Electro-Mechanics Co., Ltd. | Frontend module |
KR102260375B1 (ko) * | 2019-04-05 | 2021-06-03 | 삼성전기주식회사 | 프론트 엔드 모듈 |
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- 2012-05-16 DE DE112012002502.4T patent/DE112012002502B4/de active Active
- 2012-05-16 CN CN201280027712.1A patent/CN103597744B/zh active Active
- 2012-05-16 JP JP2013520479A patent/JP5673818B2/ja active Active
- 2012-05-16 WO PCT/JP2012/062503 patent/WO2012172909A1/ja active Application Filing
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WO2014147925A1 (en) * | 2013-03-21 | 2014-09-25 | Sony Corporation | Television receiver, television broadcast receiving method and mobile terminal |
US9479722B2 (en) | 2013-03-21 | 2016-10-25 | Sony Semiconductor Solutions Corporation | Television receiver, television broadcast receiving method and mobile terminal |
JPWO2015119178A1 (ja) * | 2014-02-10 | 2017-03-23 | 株式会社村田製作所 | 可変フィルタ回路および無線通信装置 |
CN109286387A (zh) * | 2017-07-21 | 2019-01-29 | 株式会社村田制作所 | 高频滤波器、多路复用器、高频前置电路以及通信装置 |
GB2613250A (en) * | 2018-07-18 | 2023-05-31 | Skyworks Solutions Inc | Parallel hybrid acoustic passive filter |
GB2613250B (en) * | 2018-07-18 | 2023-11-01 | Skyworks Solutions Inc | Parallel hybrid acoustic passive filter |
Also Published As
Publication number | Publication date |
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JP5673818B2 (ja) | 2015-02-18 |
DE112012002502T5 (de) | 2014-05-15 |
CN103597744A (zh) | 2014-02-19 |
DE112012002502B4 (de) | 2018-06-07 |
JPWO2012172909A1 (ja) | 2015-02-23 |
CN103597744B (zh) | 2016-09-07 |
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