CN116599493A - Low-pass filter, band-pass filter and multiplexer - Google Patents
Low-pass filter, band-pass filter and multiplexer Download PDFInfo
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- CN116599493A CN116599493A CN202310277029.3A CN202310277029A CN116599493A CN 116599493 A CN116599493 A CN 116599493A CN 202310277029 A CN202310277029 A CN 202310277029A CN 116599493 A CN116599493 A CN 116599493A
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- pass filter
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- 239000003990 capacitor Substances 0.000 claims description 26
- 230000003068 static effect Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Classifications
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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 elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
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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 elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
The application provides a low-pass filter, a band-pass filter and a multiplexer, wherein the low-pass filter comprises: a plurality of acoustic wave resonators and a plurality of lumped elements, the lumped elements comprising capacitances and inductances; a plurality of said acoustic wave resonators and a plurality of said lumped elements are connected in series and/or in parallel. Because the low-pass filter in the prior art is usually realized by a lumped circuit of combination of capacitance and inductance or a microstrip line circuit, the quality factor of the lumped element or the microstrip line circuit in the lumped circuit is lower than that of an acoustic wave element, so that the loss is larger than that of the acoustic wave element, and the low-pass filter provided by the application is realized by the combination of the acoustic wave resonator and the lumped element, and can realize a low-loss high-suppression low-pass filter.
Description
Technical Field
The present application relates to the field of semiconductor devices, and more particularly, to a low-pass filter, a band-pass filter, and a multiplexer.
Background
In recent years, with rapid development of mobile communication devices, chemical devices, biotechnology devices, and the like, there is an increasing demand for compact and lightweight filters, oscillators, resonating elements, acoustic wave resonating mass sensors, and the like used in such devices.
At present, a low-pass filter is usually realized by a lumped circuit combining a capacitor and an inductor or by a microstrip line circuit, and the disadvantage is that the circuit is oversized, especially when the working frequency is low frequency; in addition, the loss of the low-pass filter realized by the lumped circuit of the combination of capacitance and inductance or by the microstrip line circuit is also larger.
How to provide a low-pass filter with low loss and high rejection is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present application provides a low-pass filter, a band-pass filter and a multiplexer, which have the following technical schemes:
a low pass filter, the low pass filter comprising: a plurality of acoustic wave resonators and a plurality of lumped elements, the lumped elements comprising capacitances and inductances;
a plurality of said acoustic wave resonators and a plurality of said lumped elements are connected in series and/or in parallel.
Preferably, in the low-pass filter, the acoustic wave resonator includes: static capacitance, dynamic capacitance, and dynamic inductance;
the first end of the static capacitor is connected with the first end of the dynamic inductor, and the connection node is used as the first end of the acoustic wave resonator;
the second end of the dynamic inductor is connected with the first end of the dynamic capacitor;
the second end of the dynamic capacitor is connected with the second end of the static capacitor, and the connection node is used as the second end of the acoustic wave resonator.
Preferably, in the low-pass filter, the plurality of lumped elements include: a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor and a capacitor; the plurality of acoustic wave resonators includes a first acoustic wave resonator and a second acoustic wave resonator;
the first end of the first acoustic wave resonator is connected with the first end of the second inductor, and the connection node is used as the first end of the low-pass filter;
the second end of the first acoustic wave resonator is connected with the first end of the first inductor;
the second end of the second inductor is respectively connected with the first end of the fourth inductor and the first end of the capacitor;
the second end of the capacitor is connected with the first end of the third inductor;
the second end of the fourth inductor is connected with the first end of the second acoustic resonator, and the connection node is used as the second end of the low-pass filter;
the second end of the second acoustic resonator is connected with the first end of the fifth inductor;
the second end of the first inductor, the second end of the third inductor and the second end of the fifth inductor are connected, and the connecting node is grounded.
Preferably, in the low-pass filter, a series resonance frequency of the first acoustic wave resonator is greater than a cut-off frequency of the low-pass filter;
the series resonant frequency of the second acoustic resonator is greater than the cut-off frequency of the low pass filter.
Preferably, in the low-pass filter, the acoustic wave resonator is a SAW acoustic wave resonator or a BAW acoustic wave resonator or an FBAR acoustic wave resonator.
Preferably, in the low-pass filter, the low-pass filter further includes a trap circuit;
and the acoustic wave resonators and the lumped elements are connected in series and/or in parallel and then connected with the trap circuit in series.
A bandpass filter comprising a high-pass filter and a low-pass filter as claimed in any one of the preceding claims.
A multiplexer comprising a plurality of filters connected to an antenna and configured to pass signals in different frequency bands;
wherein the plurality of filters includes the low pass filter of any one of the above and the band pass filter of the above.
Compared with the prior art, the application has the following beneficial effects:
the application provides a low-pass filter comprising: a plurality of acoustic wave resonators and a plurality of lumped elements, the lumped elements comprising capacitances and inductances; a plurality of said acoustic wave resonators and a plurality of said lumped elements are connected in series and/or in parallel. Because the low-pass filter in the prior art is usually realized by a lumped circuit of combination of capacitance and inductance or a microstrip line circuit, the quality factor of the lumped element or the microstrip line circuit in the lumped circuit is lower than that of an acoustic wave element, so that the loss is larger than that of the acoustic wave element, and the low-pass filter provided by the application is realized by the combination of the acoustic wave resonator and the lumped element, and can realize a low-loss high-suppression low-pass filter.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an acoustic wave resonator and an equivalent circuit thereof according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a low-pass filter according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a low-pass filter in the prior art;
FIG. 4 is a schematic diagram showing a comparison of an acoustic wave resonator and a capacitor according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a comparison between the low-pass filter in FIG. 2 and the low-pass filter in FIG. 3 according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a low-pass filter with notch characteristics according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a bandpass filter according to an embodiment of the application;
fig. 8 is a schematic structural diagram of a multiplexer according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an acoustic wave resonator and an equivalent circuit thereof according to an embodiment of the present application; referring to fig. 2, fig. 2 is a schematic circuit diagram of a low-pass filter according to an embodiment of the present application; referring to fig. 3, fig. 3 is a schematic circuit diagram of a low-pass filter in the prior art; referring to fig. 4, fig. 4 is a schematic diagram illustrating a comparison between an acoustic wave resonator and a capacitor according to an embodiment of the present application; referring to fig. 5, fig. 5 is a schematic diagram illustrating a comparison between the low-pass filter in fig. 2 and the low-pass filter in fig. 3 according to an embodiment of the present application.
In an embodiment of the present application, there is provided a low-pass filter including: a plurality of acoustic wave resonators and a plurality of lumped elements, the lumped elements comprising a capacitance and an inductance.
A plurality of said acoustic wave resonators and a plurality of said lumped elements are connected in series and/or in parallel.
Specifically, the low-pass filter provided by the embodiment of the application is realized by combining the acoustic wave resonator and the aggregate element, and can realize a low-loss high-suppression low-pass filter.
It should be noted that, in the embodiment of the present application, the combination of the acoustic wave resonator and the collective element, that is, the series-parallel connection manner is not limited in the embodiment of the present application, and will be described in the following embodiment section by way of example.
The acoustic wave resonator includes, but is not limited to, a SAW (English full name: surface Acoustic Wave) acoustic wave resonator, a BAW (English full name: bulk Acoustic Wave) acoustic wave resonator, a FBAR (English full name: film Bulk Acoustic Resonator) acoustic wave resonator, and the like.
It should be noted that the lumped elements required in the embodiments of the present application include, but are not limited to, implementation with LTCC (Low Temperature Co-wireless Ceramic) or SMD (Surface Mounted Devices, surface mount device).
Alternatively, in another embodiment of the present application, as shown in fig. 1, the acoustic wave resonator R includes: static capacitance C0, dynamic capacitance Cm, and dynamic inductance Lm.
The first end of the static capacitor C0 is connected to the first end of the dynamic inductor Lm, and a connection node is used as the first end of the acoustic wave resonator R.
The second end of the dynamic inductance Lm is connected to the first end of the dynamic capacitance Cm.
The second end of the dynamic capacitor Cm is connected with the second end of the static capacitor C0, and the connection node is used as the second end of the acoustic wave resonator R.
Specifically, in the embodiment of the present application, the series resonance angular frequency ω r The method comprises the following steps:
parallel resonant angular frequency omega a The method comprises the following steps:
optionally, in another embodiment of the present application, as shown in fig. 2, the low-pass filter includes a plurality of lumped elements including: a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth inductor L5, and a capacitor C; the plurality of acoustic wave resonators R includes a first acoustic wave resonator R1 and a second acoustic wave resonator R2.
The first end of the first acoustic wave resonator R1 is connected to the first end of the second inductor L2, and the connection node is used as the first end of the low-pass filter.
The second end of the first acoustic wave resonator R1 is connected to the first end of the first inductor L1.
The second end of the second inductor L2 is connected to the first end of the fourth inductor L4 and the first end of the capacitor C, respectively.
The second end of the capacitor C is connected to the first end of the third inductor L3.
The second end of the fourth inductor L4 is connected to the first end of the second acoustic resonator R2, and the connection node is used as the second end of the low-pass filter.
A second end of the second acoustic resonator R2 is connected to a first end of the fifth inductor L5.
The second end of the first inductor L1, the second end of the third inductor L3 and the second end of the fifth inductor L5 are connected, and the connection node is grounded.
Specifically, in the embodiment of the present application, as shown in fig. 3, a circuit structure of a conventional low-pass filter is provided, based on the structure shown in fig. 2 and the structure shown in fig. 3, the capacitor C1 in fig. 3 is replaced by the first acoustic wave resonator R1, and the capacitor C2 is replaced by the second acoustic wave resonator R2. It should be noted that, the other elements in the structure shown in fig. 2 and the structure shown in fig. 3 are the same, and thus the same symbols are illustrated in fig. 2 and 3.
Referring to fig. 4, fig. 4 is a schematic diagram showing a comparison between an acoustic wave resonator and a capacitor according to an embodiment of the present application, and particularly, fig. 4 is a schematic diagram showing an impedance characteristic of the acoustic wave resonator R1 when a static capacitance C0 of the acoustic wave resonator R1 is equal to a capacitance C1 of fig. 3, wherein a dotted line represents the capacitance C1, a solid line represents the acoustic wave resonator R1, and an impedance of the acoustic wave resonator R1 is close to an impedance outside a resonant frequency but the impedance of the acoustic wave resonator R1 is rapidly changed within the resonant frequency based on the schematic effect of fig. 4. Therefore, in the embodiment of the present application, the series resonance frequency of the two acoustic wave resonators is designed to be higher than the cut-off frequency of the low-pass filter, that is, the series resonance frequency of the first acoustic wave resonator is greater than the cut-off frequency of the low-pass filter, and the series resonance frequency of the second acoustic wave resonator is greater than the cut-off frequency of the low-pass filter, so that the low-loss high-suppression low-pass filter can be realized.
Further, as can be seen from fig. 5, fig. 5 is a schematic diagram of comparison between the low-pass filter in fig. 2 and the low-pass filter in fig. 3 provided by the embodiment of the present application, specifically for convenience in comparing the difference between the conventional low-pass filter and the low-pass filter in the present application, the value of the static capacitance C0 in the first acoustic wave resonator R1 is equal to the value of the capacitance C1 in fig. 3, the value of the static capacitance C0 in the second acoustic wave resonator R2 is equal to the value of the capacitance C2 in fig. 3, and other elements are the same, where the dashed line represents the trend of the loss variation of the conventional low-pass filter, the solid line represents the trend of the loss variation of the low-pass filter in the present application, and the low-pass filter provided by the embodiment of the present application has lower loss and has high rejection characteristics outside the near-end band based on the loss characteristic effect illustrated in fig. 5. Specifically, the low-pass filter provided by the embodiment of the application can inhibit the low-pass filter by more than 35dB at 4150MHz, and the loss is only 2dB at 4000 MHz.
Optionally, in another embodiment of the present application, referring to fig. 6, fig. 6 is a schematic structural diagram of a low-pass filter with notch characteristics according to an embodiment of the present application, where the low-pass filter further includes: a trap circuit.
And the acoustic wave resonators and the lumped elements are connected in series and/or in parallel and then connected with the trap circuit in series.
Specifically, in the embodiment of the present application, a trap circuit may be connected in series to the basic unit architecture of the low-pass filter shown in fig. 2, so as to implement a low-pass filter with a trap characteristic.
Optionally, in another embodiment of the present application, a bandpass filter is further provided, and referring to fig. 7, fig. 7 is a schematic structural diagram of a bandpass filter according to an embodiment of the present application, where the bandpass filter includes a high-pass filter and a basic unit architecture of the low-pass filter shown in fig. 2.
That is, the band-pass filter can be realized by concatenating the high-pass filter based on the basic unit architecture of the low-pass filter shown in fig. 2.
Optionally, in another embodiment of the present application, a multiplexer is further provided, and referring to fig. 8, fig. 8 is a schematic structural diagram of a multiplexer provided in an embodiment of the present application, where the multiplexer includes a plurality of filters connected to an antenna and configured to pass signals in different frequency bands.
Wherein the plurality of filters includes the basic unit architecture of the low pass filter shown in fig. 2 and the band pass filter described above.
It should be noted that the plurality of filters may also include a low-pass filter and a high-pass filter with notch characteristics as shown in fig. 8.
That is, the basic unit architecture of the low-pass filter shown in fig. 2 provided according to the embodiment of the present application can be applied differently, and in the embodiment of the present application, only the band-pass filter and the multiplexer are used as an example for illustration.
The low-pass filter, the band-pass filter and the multiplexer provided by the application are described in detail, and specific examples are applied to the principle and the implementation of the application, and the description of the above examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include, or is intended to include, elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A low pass filter, the low pass filter comprising: a plurality of acoustic wave resonators and a plurality of lumped elements, the lumped elements comprising capacitances and inductances;
a plurality of said acoustic wave resonators and a plurality of said lumped elements are connected in series and/or in parallel.
2. The low pass filter of claim 1, wherein the acoustic wave resonator comprises: static capacitance, dynamic capacitance, and dynamic inductance;
the first end of the static capacitor is connected with the first end of the dynamic inductor, and the connection node is used as the first end of the acoustic wave resonator;
the second end of the dynamic inductor is connected with the first end of the dynamic capacitor;
the second end of the dynamic capacitor is connected with the second end of the static capacitor, and the connection node is used as the second end of the acoustic wave resonator.
3. The low pass filter of claim 1, wherein a plurality of the lumped elements comprise: a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor and a capacitor; the plurality of acoustic wave resonators includes a first acoustic wave resonator and a second acoustic wave resonator;
the first end of the first acoustic wave resonator is connected with the first end of the second inductor, and the connection node is used as the first end of the low-pass filter;
the second end of the first acoustic wave resonator is connected with the first end of the first inductor;
the second end of the second inductor is respectively connected with the first end of the fourth inductor and the first end of the capacitor;
the second end of the capacitor is connected with the first end of the third inductor;
the second end of the fourth inductor is connected with the first end of the second acoustic resonator, and the connection node is used as the second end of the low-pass filter;
the second end of the second acoustic resonator is connected with the first end of the fifth inductor;
the second end of the first inductor, the second end of the third inductor and the second end of the fifth inductor are connected, and the connecting node is grounded.
4. A low pass filter according to claim 3 wherein the series resonant frequency of the first acoustic wave resonator is greater than the cut-off frequency of the low pass filter;
the series resonant frequency of the second acoustic resonator is greater than the cut-off frequency of the low pass filter.
5. The low pass filter of claim 1, wherein the acoustic wave resonator is a SAW acoustic wave resonator or a BAW acoustic wave resonator or an FBAR acoustic wave resonator.
6. The low pass filter of claim 1, wherein the low pass filter further comprises a trap circuit;
and the acoustic wave resonators and the lumped elements are connected in series and/or in parallel and then connected with the trap circuit in series.
7. A bandpass filter, characterized in that it comprises a high-pass filter and a low-pass filter according to any one of claims 1-5.
8. A multiplexer comprising a plurality of filters connected to an antenna and configured to pass signals in different frequency bands;
wherein the plurality of filters comprises the low pass filter of any one of claims 1-5 and the band pass filter of claim 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310277029.3A CN116599493A (en) | 2023-03-17 | 2023-03-17 | Low-pass filter, band-pass filter and multiplexer |
| PCT/CN2023/127736 WO2024193037A1 (en) | 2023-03-17 | 2023-10-30 | Low-pass filter, band-pass filter, and multiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310277029.3A CN116599493A (en) | 2023-03-17 | 2023-03-17 | Low-pass filter, band-pass filter and multiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116599493A true CN116599493A (en) | 2023-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310277029.3A Pending CN116599493A (en) | 2023-03-17 | 2023-03-17 | Low-pass filter, band-pass filter and multiplexer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116599493A (en) |
| WO (1) | WO2024193037A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024193037A1 (en) * | 2023-03-17 | 2024-09-26 | 安徽安努奇科技有限公司 | Low-pass filter, band-pass filter, and multiplexer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922117B2 (en) * | 2002-05-07 | 2005-07-26 | Agilent Technologies, Inc. | Lumped element transmission line frequency multiplexer |
| TWI834692B (en) * | 2018-07-18 | 2024-03-11 | 美商天工方案公司 | Hybrid acoustic lc filter with harmonic suppression |
| CN109672422B (en) * | 2019-02-22 | 2023-08-25 | 安徽安努奇科技有限公司 | filter circuit and multiplexer |
| CN116599493A (en) * | 2023-03-17 | 2023-08-15 | 安徽安努奇科技有限公司 | Low-pass filter, band-pass filter and multiplexer |
-
2023
- 2023-03-17 CN CN202310277029.3A patent/CN116599493A/en active Pending
- 2023-10-30 WO PCT/CN2023/127736 patent/WO2024193037A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024193037A1 (en) * | 2023-03-17 | 2024-09-26 | 安徽安努奇科技有限公司 | Low-pass filter, band-pass filter, and multiplexer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024193037A1 (en) | 2024-09-26 |
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