WO2023216465A1 - Filtre à ondes acoustiques de surface et multiplexeur - Google Patents

Filtre à ondes acoustiques de surface et multiplexeur Download PDF

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Publication number
WO2023216465A1
WO2023216465A1 PCT/CN2022/115229 CN2022115229W WO2023216465A1 WO 2023216465 A1 WO2023216465 A1 WO 2023216465A1 CN 2022115229 W CN2022115229 W CN 2022115229W WO 2023216465 A1 WO2023216465 A1 WO 2023216465A1
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WO
WIPO (PCT)
Prior art keywords
acoustic wave
surface acoustic
wave filter
resonant circuit
resonator
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Application number
PCT/CN2022/115229
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English (en)
Chinese (zh)
Inventor
石麒麟
左成杰
何军
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安徽安努奇科技有限公司
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Publication of WO2023216465A1 publication Critical patent/WO2023216465A1/fr

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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
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H03H9/6426—Combinations of the characteristics of different transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects

Definitions

  • Embodiments of the present application relate to the field of filtering technology, for example, to a surface acoustic wave filter and a multiplexer.
  • filters play an important role.
  • active filters can improve the stability of communication systems and power distribution systems, and extend the service life of communication equipment and power equipment.
  • saving circuit space and cost is a major problem in circuit design.
  • smaller surface acoustic wave filters are used to save circuit space.
  • the suppression effect at the near end outside the passband is poor, thus affecting the quality of the communication signal.
  • This application provides a surface acoustic wave filter and a multiplexer.
  • a surface acoustic wave filter which includes:
  • a surface acoustic wave element which is connected between the input terminal and the output terminal of the surface acoustic wave filter;
  • a surface acoustic wave resonance unit is connected between the input terminal and the output terminal.
  • a multiplexer includes the surface acoustic wave filter provided by any embodiment of the present application.
  • Figure 1 is a schematic structural diagram of a surface acoustic wave filter provided according to an embodiment of the present application
  • Figure 2 is a schematic structural diagram of another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 3 is an insertion loss characteristic curve diagram of a surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 4 is an admittance characteristic curve diagram of a surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 5 is a schematic structural diagram of another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 6 is an insertion loss characteristic curve of yet another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 7 is an admittance characteristic curve of yet another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of another surface acoustic wave filter provided according to an embodiment of the present application.
  • Figure 11 is a schematic structural diagram of a multiplexer provided according to an embodiment of the present application.
  • Figure 12 is a partial structural schematic diagram of yet another surface acoustic wave filter provided according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a surface acoustic wave filter provided by an embodiment of the present application.
  • the surface acoustic wave filter includes: a surface acoustic wave element 10 and a surface acoustic wave resonant unit 20 .
  • the surface acoustic wave element 10 is connected between the input terminal 30 and the output terminal 40 of the surface acoustic wave filter; the surface acoustic wave resonance unit 20 is connected between the input terminal 30 and the output terminal 40 .
  • the surface acoustic wave element 10 utilizes the characteristics of an acoustic-electric transducer to achieve acoustic-to-electrical conversion, so that electrical signals can be converted into surface acoustic waves for transmission, thereby realizing the propagation of electrical signals.
  • One end of the surface acoustic wave element 10 is electrically connected to the input terminal 30 , and the other end is electrically connected to the output terminal 40 .
  • the surface of the base material of the surface acoustic wave element 10 will generate mechanical vibration, and at the same time, a surface acoustic wave with the same frequency as the external electrical signal will be excited.
  • the surface acoustic wave can travel along the surface of the base material. propagates and is output by the output terminal 40, thereby realizing the propagation of electrical signals.
  • the volume of the surface acoustic wave element 10 is smaller than that of other electromagnetic wave devices and has a higher quality factor.
  • the rate of energy loss is slow. Therefore, in complex communication circuits, the use of surface acoustic wave components 10 can save circuit space and ensure the quality of communication signals.
  • a surface acoustic wave resonance unit 20 is added to the surface acoustic wave filter.
  • One end of the surface acoustic wave resonance unit 20 is electrically connected to the input terminal 30 , and the other end is electrically connected to the output terminal 40 . That is, the surface acoustic wave element 10 is integrally connected to the input terminal 30 .
  • the surface acoustic wave resonance unit 20 is connected in parallel and connected between the input terminal 30 and the output terminal 40 .
  • the surface acoustic wave resonant unit 20 has frequency selection capability, which can retain electrical signals of specific frequencies and filter electrical signals other than specific frequencies.
  • the surface acoustic wave resonant unit 20 can filter the out-of-band near-end signal corresponding to the frequency on the high-frequency side of the passband to achieve a good suppression effect of the out-of-band near-end electrical signals, so that the distance between the passband and the stopband can be reduced.
  • the roll-off slope of the transition phase increases. This improves the out-of-band suppression capability of the surface acoustic wave filter, has a good filtering effect, and improves the quality of the electrical signals transmitted by the surface acoustic wave filter.
  • the surface acoustic wave resonance unit by adding a surface acoustic wave resonance unit between the input terminal and the output terminal, the surface acoustic wave resonance unit can adjust the passband edge position of the surface acoustic wave filter.
  • the corresponding frequency signal is suppressed, so that the steep drop in the transition area between the passband and the stopband of signal transmission increases, and the roll-off slope increases. Therefore, adding a surface acoustic wave resonance unit between the input terminal and the output terminal of the surface acoustic wave filter can improve the signal suppression effect of the surface acoustic wave filter at the near end outside the passband, and can increase the corresponding frequency at the edge of the passband.
  • the transmission quality of electrical signals by adding a surface acoustic wave resonance unit between the input terminal and the output terminal, the surface acoustic wave resonance unit can adjust the passband edge position of the surface acoustic wave filter.
  • the corresponding frequency signal is suppressed, so that the steep drop in the transition area between
  • the surface acoustic wave element 10 may be a surface acoustic wave resonator.
  • FIG. 2 is a schematic structural diagram of another surface acoustic wave filter provided by an embodiment of the present application.
  • the surface acoustic wave resonant unit 20 includes: a surface acoustic wave resonator 21 .
  • the first end of the surface acoustic wave resonator 21 is connected to the input terminal 30 , and the second end of the surface acoustic wave resonator 21 is connected to the output terminal 40 .
  • the surface acoustic wave resonator 21 mainly utilizes the piezoelectric properties of the piezoelectric material to perform an electrical-acoustic-electrical signal conversion process on the input electrical signal.
  • the surface acoustic wave resonator 21 is connected between the input terminal 30 and the output terminal 40 of the surface acoustic wave filter.
  • the electrical signal is input from the input terminal 30, it is converted into surface acoustic waves by the input transducer in the surface acoustic wave resonator 21, and mechanical vibration occurs.
  • the mechanical vibration with the same frequency as the resonant frequency of the surface acoustic wave resonator 21 propagates along the surface of the piezoelectric material to one end of the output terminal 40, and at the output end, the transmitted mechanical vibration of a specific frequency is converted into electrical energy through the output transducer.
  • the signal is output from the output terminal 40; and the mechanical vibration with a frequency different from the resonant frequency of the surface acoustic wave resonator 21 cannot propagate along the surface of the piezoelectric material. Therefore, the surface acoustic wave resonator 21 can realize the electrical signal of a specific frequency. Transmit and filter electrical signals at unwanted frequencies.
  • adding the surface acoustic wave resonator 21 between the input terminal 30 and the output terminal 40 of the surface acoustic wave filter can increase the steep drop at the out-of-band near-end position of the passband, increase the roll-off slope, and improve the acoustic performance.
  • the out-of-band suppression capability of the surface wave filter prevents the transmission signal from being interfered by signals of other frequencies and improves the quality of the transmission signal.
  • the resonant frequency of the surface acoustic wave resonant unit 20 is located in the adjacent band frequency range of the surface acoustic wave filter close to the maximum value of the passband.
  • the resonant frequency of the surface acoustic wave resonator 21 is the resonant frequency of the surface acoustic wave resonator unit 20 .
  • the resonant frequency of the surface acoustic wave resonator 21 can be set to any frequency value according to the needs of actual applications. Adjacent band frequencies are the channel frequency ranges immediately adjacent to both sides of the main channel passband range.
  • setting the resonant frequency of the surface acoustic wave resonator 21 in the adjacent band frequency range of the surface acoustic wave filter close to the maximum value of the passband can increase and weaken the steep drop of the high frequency side of the passband in the adjacent band frequency range.
  • the adjacent channel signal interferes with the signal transmitted by the main channel; and the surface acoustic wave resonator 21 forms additional transmission zero points in the adjacent band frequency range on the high frequency side of the passband, adding a new resonance peak, thereby broadening the acoustic Passband bandwidth of surface wave filter.
  • FIG. 3 is an insertion loss characteristic curve diagram of the surface acoustic wave filter provided by the embodiment of the present application.
  • the resonant frequency of the surface acoustic wave resonator may be set to 1.03 GHz.
  • the dotted line 100 is the insertion loss characteristic curve of the transmission signal tested for the traditional filter circuit;
  • the solid line 200 is the insertion loss characteristic curve of the transmission signal tested for the surface acoustic wave filter provided in this embodiment.
  • the insertion loss of the signal of the traditional filter circuit represented by the dotted line 100 drops sharply on the low-frequency side of the passband, that is, in the range of 0.99-0.98GHz. This indicates that the out-of-band suppression effect of the traditional filter circuit is worse on the low-frequency side.
  • the transmitted signal strength begins to slowly attenuate, and the attenuation process of the signal strength continues from 1.02GHz to a frequency slightly greater than 1.04GHz.
  • the signal strength of the in-band transmission signal weakens and is easily affected by other signals of the same frequency, causing the signal quality to decrease.
  • the out-of-band suppression effect on the low-frequency side of the passband is still good, and on the high-frequency side of the passband, due to the resonant frequency of 1.03GHz, the out-of-band suppression effect is still good.
  • the effect of the surface wave resonator causes the signal insertion loss to increase sharply in the frequency range of 1.028-1.03GHz at the edge of the passband, that is, the roll-off slope increases.
  • connecting a surface acoustic wave resonator between the input terminal and the output terminal can improve the signal quality at the edge of the passband, and at the same time expand the bandwidth of the passband, that is, widen the bandwidth from the frequency range of 0.988-1.02GHz to Frequency range 0.988-1.028GHz.
  • Figure 4 is an admittance characteristic curve diagram of a surface acoustic wave filter provided by an embodiment of the present application.
  • electrical admittance is used to describe the difficulty of AC current passing through a circuit.
  • Electrical admittance consists of conductance and susceptance.
  • Electrical admittance is a vector, including real and imaginary parts. Among them, the real part of the electrical admittance represents the electrical conductance. The higher the electrical conductance value, the easier it is for the charge to pass through.
  • the dotted line 101 is the admittance characteristic curve of the traditional filter circuit
  • the solid line 201 is the admittance characteristic curve of the surface acoustic wave filter provided in this embodiment.
  • the solid line 201 has a new resonant peak at a frequency of approximately 1.028 GHz and has a higher conductance value, indicating that the surface acoustic wave filter can receive electrical signals with a frequency of 1.028 GHz. Therefore, it can be shown that connecting a surface acoustic wave resonator between the input terminal and the output terminal increases the bandwidth of the surface acoustic wave filter.
  • FIG. 5 is a schematic structural diagram of another surface acoustic wave filter provided by an embodiment of the present application.
  • the surface acoustic wave resonant unit 20 includes at least two surface acoustic wave resonators 21 , and the at least two surface acoustic wave resonators 21 are connected in series.
  • the first end of the surface acoustic wave resonator 21 located at the head end is connected to the input terminal 30
  • the second end of the surface acoustic wave resonator 21 located at the end is connected to the output terminal 40 .
  • FIG. 5 shows a structure of a surface acoustic wave filter in which two surface acoustic wave resonators 21 are connected in series.
  • Two surface acoustic wave resonators 21 are connected in series, the first end of the surface acoustic wave resonator 21 at the head end is connected to the input terminal 30, and the second end of the surface acoustic wave resonator 21 at the head end is connected to the end acoustic wave resonator 21.
  • the first end of the surface wave resonator 21 and the second end of the surface acoustic wave resonator 21 located at the end are connected to the output terminal 40 .
  • Figure 6 is an insertion loss characteristic curve of yet another surface acoustic wave filter provided by an embodiment of the present application.
  • the dotted line 102 is the signal insertion loss characteristic curve of the traditional filter circuit
  • the solid line 202 is the signal insertion loss characteristic curve of the surface acoustic wave filter provided in this embodiment. It can be seen that connecting two surface acoustic wave resonators 21 with different resonant frequencies in series can also increase the roll-off slope of the signal insertion loss in the passband edge transition zone, thereby improving the bandwidth of the surface acoustic wave filter on the high-frequency side. The near-end signal suppression effect improves the quality of the transmitted signal.
  • the surface acoustic wave resonant unit 20 is a plurality of surface acoustic wave resonators, At 21 o'clock, the resonant frequencies of each surface acoustic wave resonator 21 are set in the adjacent band frequency range of the surface acoustic wave filter close to the maximum value of the passband, and there are slight differences between them, then the resonant frequency of the surface acoustic wave resonant unit 20 It is equal to the maximum resonant frequency among the plurality of surface acoustic wave resonators 21 .
  • the resonant frequencies of the two surface acoustic wave resonators 21 can be set to two different values near 1.03 GHz.
  • the resonant frequencies of the two surface acoustic wave resonators 21 can be set to 1.028 GHz and 1.03 respectively.
  • GHz Figure 7 is an admittance characteristic curve of yet another surface acoustic wave filter provided by an embodiment of the present application. As shown in Figure 7, the dotted line 103 is the admittance characteristic curve of the traditional filter circuit, and the solid line 203 is the admittance characteristic curve of the surface acoustic wave filter provided in this embodiment.
  • connecting two surface acoustic wave resonators 21 in series can also widen the bandwidth of the surface acoustic wave filter.
  • connecting two surface acoustic wave resonators 21 with slightly different resonant frequencies in series can further widen the bandwidth from 1.028GHz to 1.03GHz, increasing the bandwidth range of the surface acoustic wave filter. , broaden the effective signal range that can be received.
  • the surface acoustic wave resonator unit 20 further includes: a bulk acoustic wave resonator.
  • the first end of the BAW resonator is connected to the input terminal 30
  • the second end of the BAW resonator is connected to the output terminal 40 .
  • the bulk acoustic wave resonator is connected between the input terminal 30 and the output terminal 40, and also has the function of allowing signals of a specific resonant frequency to pass through and filtering out all signals other than the specific frequency, thereby improving the performance of the surface acoustic wave filter on the high-frequency side.
  • the out-of-band near-end signal suppression effect When the surface acoustic wave resonant unit 20 is a bulk acoustic wave resonator, the resonant frequency of the bulk acoustic wave resonator is the resonant frequency of the surface acoustic wave resonant unit 20 .
  • the bulk acoustic wave resonator may include a thin film bulk acoustic wave resonator.
  • the bulk acoustic wave resonator is made of silicon substrate using micro-electromechanical technology and thin film technology. Therefore, the preparation process of bulk acoustic wave resonators is relatively complex, and production and preparation are difficult.
  • the surface acoustic wave resonant unit 20 further includes: a resonant circuit, the first end of the resonant circuit is connected to the input terminal 30, and the second end of the resonant circuit is connected to the output terminal 40.
  • the resonant circuit is resistive and has the ability to select frequencies. It can retain electrical signals at specific frequencies and filter out electrical signals outside specific frequencies, thereby improving the quality of electrical signals and reducing noise or interference caused by other signals.
  • the resonant circuit may include a series resonant circuit 221 and a parallel resonant circuit 222 .
  • FIG. 8 is a schematic structural diagram of yet another surface acoustic wave filter provided by an embodiment of the present application.
  • the resonant circuit includes an inductor 2202, a capacitor 2203 and a resistor 2201.
  • the first end of the resistor 2201 serves as the first end of the resonant circuit.
  • the second end of the resistor 2201 is electrically connected to the first end of the inductor 2202.
  • the second end of the inductor 2202 is electrically connected to the first end of the capacitor 2203, and the second end of the capacitor 2203 serves as the second end of the resonant circuit, forming a series resonant circuit 221.
  • the resonant frequency of the series resonant circuit 221 is the resonant frequency of the surface acoustic wave resonant unit 20.
  • FIG. 9 is a schematic structural diagram of another surface acoustic wave filter provided by an embodiment of the present application.
  • the first end of the resistor 2201, the first end of the inductor 2202 and the first end of the capacitor 2203 are all used as the first end of the resonant circuit.
  • the second end of the resistor 2201 and the second end of the inductor 2202 The second end of the capacitor 2203 and the second end of the capacitor 2203 serve as the second end of the resonant circuit, forming a parallel resonant circuit 222.
  • the resonant frequency of the parallel resonant circuit 222 is the resonant frequency of the surface acoustic wave resonant unit 20.
  • the parameters of the inductor 2202 and the capacitor 2203 are adjusted so that the resonant frequency of the series resonant circuit 221 or the resonant frequency of the parallel resonant circuit 222 is within the adjacent band frequency range on the high-frequency side of the passband, thereby making the passband on the high-frequency side of the passband
  • the roll-off slope increases in the transition region between the band and the stop band. Therefore, the signal suppression effect of the surface acoustic wave filter at the out-of-band near-end on the high-frequency side of the passband is improved.
  • the resonant circuit compared with surface acoustic wave resonators, the resonant circuit has a smaller quality factor, a larger signal energy loss, and the resonant circuit is larger in size, which is not conducive to the effect of saving circuit space.
  • FIG. 10 is a schematic structural diagram of yet another surface acoustic wave filter provided by an embodiment of the present application.
  • the surface acoustic wave filter also includes a piezoelectric substrate 13, and the surface acoustic wave element 10 includes: at least three odd-numbered interdigital transducers 11 and reflectors. 12.
  • At least three interdigital transducers 11 are arranged along the first direction, and the interdigital transducer 11 includes a plurality of electrode fingers; the plurality of electrode fingers extend along the second direction and are arranged along the first direction, wherein the first direction is the propagation direction of the surface acoustic wave signal on the piezoelectric substrate 13, and the second direction is orthogonal to the first direction;
  • the reflector 12 is disposed on both sides of the plurality of interdigital transducers 11 in the first direction.
  • the reflector 12 includes a plurality of electrode fingers. The plurality of electrode fingers are arranged along the first direction and extend along the second direction.
  • the surface acoustic wave filter includes an odd number of interdigital transducers (IDTs) 11, and the number is at least 3.
  • IDTs interdigital transducers
  • An odd number of IDTs 11 are arranged in a row along the first direction, and are connected in a centrally symmetrical manner.
  • one end of the centrally located interdigital transducer 11 is electrically connected to the input terminal 30 and the other end is grounded; the interdigital transducers 11 arranged on both sides adjacent to the centrally located interdigital transducer 11 One end is electrically connected to the output terminal 40, and the other end is grounded.
  • the odd number of interdigital transducers 11 arranged in a centrally symmetrical connection manner can avoid the occurrence of small local fluctuations and improve the insertion loss in the passband of the surface acoustic wave filter.
  • the odd number of interdigital transducers 11 include transmitting transducers and receiving transducers.
  • Each interdigital transducer 11 includes multiple electrode fingers, and the number of electrode fingers is not specifically limited.
  • the direction in which the electrode fingers extend is the second direction, and the direction in which the electrode fingers extend is orthogonal to the direction of signal propagation.
  • Surface acoustic wave filters propagate electrical signals based on the piezoelectric effect produced by a piezoelectric substrate.
  • an electrical signal is input to the transmitting transducer, a potential difference is generated between adjacent electrode fingers in the transmitting transducer, thereby forming an electric field between the input electrode fingers, causing the piezoelectric substrate to mechanically vibrate and vibrate along the surface in the form of surface acoustic waves.
  • First direction propagation.
  • surface acoustic waves are transmitted to the receiving transducer, charges are generated between the electrode fingers of the receiving transducer due to the piezoelectric effect, thereby outputting an alternating electrical signal to achieve signal screening and transmission.
  • the surface acoustic wave element 10 also includes reflectors 12, which are arranged on both sides of the odd-numbered interdigital transducers 11 arranged along the first direction, which can further suppress the occurrence of small fluctuations in the signal in the passband and improve the signal transmission in the band. of stability.
  • the arrangement of the piezoelectric substrate 13 may refer to FIG. 12 .
  • FIG. 11 is a schematic structural diagram of a multiplexer provided by an embodiment of the present application. As shown in FIG. 11 , the multiplexer includes the surface acoustic wave filter 50 provided by any embodiment of the present application.
  • the multiplexer contains at least two surface acoustic wave filters 50 and has one input port and at least two output ports.
  • the multiplexer includes an input port IN and n output ports, respectively OUT1, OUT2...OUTn.
  • Each surface acoustic wave filter 50 is connected in series between the input port IN and any output port.
  • the surface acoustic wave filter 50 is connected in series between the input port IN and the output port OUT1, or the surface acoustic wave filter 50 is connected in series between Between input port IN and output port OUT2.
  • the multiplexer includes the surface acoustic wave filter 50 provided in any embodiment of the present application.
  • the multiplexer has the beneficial effects of the surface acoustic wave filter 50 , that is, the multiplexer increases the high-frequency side of the passband and the resistance.
  • the roll-off slope of the transition area between the bands improves the signal suppression capability of the out-of-band near-end, effectively prevents interference from other signals, and increases the operating bandwidth of the surface acoustic wave filter 50 .

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

La présente divulgation concerne un filtre à ondes acoustiques de surface, comprenant : un élément à ondes acoustiques de surface (10), l'élément à ondes acoustiques de surface (10) étant connecté entre une borne d'entrée (30) et une borne de sortie (40) du filtre à ondes acoustiques de surface ; et une unité résonante à ondes acoustiques de surface (20), l'unité résonante à ondes acoustiques de surface (20) étant connectée entre la borne d'entrée (30) et la borne de sortie (40). Un multiplexeur, comprenant le filtre à ondes acoustiques de surface (50).
PCT/CN2022/115229 2022-05-12 2022-08-26 Filtre à ondes acoustiques de surface et multiplexeur WO2023216465A1 (fr)

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Application Number Priority Date Filing Date Title
CN202210516804.1A CN114938217A (zh) 2022-05-12 2022-05-12 一种声表面波滤波器及多工器
CN202210516804.1 2022-05-12

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WO2023216465A1 true WO2023216465A1 (fr) 2023-11-16

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Publication number Priority date Publication date Assignee Title
CN114938217A (zh) * 2022-05-12 2022-08-23 安徽安努奇科技有限公司 一种声表面波滤波器及多工器

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CN1319950A (zh) * 2000-03-10 2001-10-31 株式会社村田制作所 声表面波装置
JP2002124847A (ja) * 2000-10-12 2002-04-26 Oki Electric Ind Co Ltd 弾性表面波装置
CN1391343A (zh) * 2001-06-12 2003-01-15 株式会社村田制作所 声表面波滤波器
CN102545829A (zh) * 2010-11-17 2012-07-04 太阳诱电株式会社 滤波器电路、双工器和rf模块
CN108123698A (zh) * 2018-02-08 2018-06-05 武汉衍熙微器件有限公司 一种具有带外抑制的滤波器
CN110431744A (zh) * 2017-03-15 2019-11-08 株式会社村田制作所 多工器、高频前端电路以及通信装置
CN114938217A (zh) * 2022-05-12 2022-08-23 安徽安努奇科技有限公司 一种声表面波滤波器及多工器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1319950A (zh) * 2000-03-10 2001-10-31 株式会社村田制作所 声表面波装置
JP2002124847A (ja) * 2000-10-12 2002-04-26 Oki Electric Ind Co Ltd 弾性表面波装置
CN1391343A (zh) * 2001-06-12 2003-01-15 株式会社村田制作所 声表面波滤波器
CN102545829A (zh) * 2010-11-17 2012-07-04 太阳诱电株式会社 滤波器电路、双工器和rf模块
CN110431744A (zh) * 2017-03-15 2019-11-08 株式会社村田制作所 多工器、高频前端电路以及通信装置
CN108123698A (zh) * 2018-02-08 2018-06-05 武汉衍熙微器件有限公司 一种具有带外抑制的滤波器
CN114938217A (zh) * 2022-05-12 2022-08-23 安徽安努奇科技有限公司 一种声表面波滤波器及多工器

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