CN111934648A - Filter assembly based on SAW-BAW technology combined application - Google Patents
Filter assembly based on SAW-BAW technology combined application Download PDFInfo
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- CN111934648A CN111934648A CN202010755241.2A CN202010755241A CN111934648A CN 111934648 A CN111934648 A CN 111934648A CN 202010755241 A CN202010755241 A CN 202010755241A CN 111934648 A CN111934648 A CN 111934648A
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- 238000005516 engineering process Methods 0.000 title abstract description 14
- 238000010897 surface acoustic wave method Methods 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims 9
- 230000002776 aggregation Effects 0.000 abstract description 5
- 238000004220 aggregation Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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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
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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
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers
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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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
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- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
A filter assembly based on combined application of SAW-BAW technology of the present invention includes a first acoustic filter and a second acoustic filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and a common node. By integrating the latest Bulk Acoustic Wave (BAW) and Surface Acoustic Wave (SAW) filter technologies, extremely small volumes are achieved. This volume advantage helps cell phone manufacturers to produce ultra-thin phones while facilitating the integration of advanced multimedia functions to meet the user's needs. In combination with traditional LC filters and diplexer, multiplexer products to help solve various carrier aggregation configurations deployed by operators and the like to extend the coverage, speed and capacity of gigabit networks to enhance user experience.
Description
Technical Field
The invention belongs to the technical field of filters, and particularly relates to a filter component based on combined application of SAW-BAW technology.
Background
In radio frequency filters, an important characteristic is the steepness of the transition band, i.e. the curve between the pass band and the stop band in the band pass characteristic of the filter. The transition bandwidth between the pass band and the stop band, if too narrow, can greatly increase the design difficulty of the filter. In order to improve the steepness of the transition band, the design of the connection circuit between the resonators constituting the filter is important, but the characteristics (quality factor or Q value) of the resonance unit itself are also critical factors. In order to meet the filter design requirements of these high-difficulty frequency bands, the Q value of the resonant unit needs to be increased.
SAW devices have been widely used in radio frequency filters having interdigital transducers mounted on the surface of a piezoelectric substrate. The resonance characteristics of the surface acoustic wave excited by the IDT determine the characteristic frequency band of the RF filter
The BAW filter has high sound energy density, and the structure can well guide and limit sound waves and has very low loss. At microwave frequencies, BAW achievable Q values, at comparable volumes, are higher than any other type of filter, and can be: 2500@2 GHz. This results in excellent rejection and insertion loss performance even at the tight edges of the passband. The BAW filter also shrinks in size with increasing frequency, which makes it very suitable for very demanding 4G, 5G applications. Furthermore, even in high bandwidth designs, BAWs are less sensitive to temperature variations, while they also have very low losses and very steep filter skirts.
However, the existing technology is difficult to reduce the whole volume of the filter and improve the performance of the filter.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems that the whole size of a filter is difficult to be well reduced and the performance of the filter is difficult to be improved in the prior art.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a filter assembly based on combined application of SAW-BAW technology of the present invention includes a first acoustic filter and a second acoustic filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and a common node.
Preferably, the first acoustic wave filter and the second acoustic wave filter each include a surface acoustic wave resonator and a bulk acoustic wave resonator connected in series.
Preferably, the number of bulk acoustic wave resonators in the first acoustic wave filter is greater than twice the number of surface acoustic wave resonators.
Preferably, the surface acoustic wave resonator includes at least five resonators.
Preferably, the first acoustic wave filter may further include a parallel bulk acoustic wave resonator coupled to the common node, the parallel bulk acoustic wave resonator being coupled to the surface acoustic wave resonator through a series bulk acoustic wave resonator.
Preferably, the second acoustic wave filter includes a second surface acoustic wave resonator and a second bulk acoustic wave resonator coupled between the second surface acoustic wave resonator and the common node.
Preferably, at least two additional acoustic wave filters are further included coupled to the common node.
Preferably, at least four additional acoustic wave filters are included that are coupled to the common node.
Preferably, at least six additional acoustic wave filters are included that are coupled to the common node.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
a filter assembly based on combined application of SAW-BAW technology of the present invention includes a first acoustic filter and a second acoustic filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and a common node. By integrating the latest Bulk Acoustic Wave (BAW) and Surface Acoustic Wave (SAW) filter technologies, extremely small volumes are achieved. This volume advantage helps cell phone manufacturers to produce ultra-thin phones while facilitating the integration of advanced multimedia functions to meet the user's needs. In combination with traditional LC filters and diplexer, multiplexer products to help solve various carrier aggregation configurations deployed by operators and the like to extend the coverage, speed and capacity of gigabit networks to enhance user experience. And the design of carrier aggregation support in the amplifier module can be simplified, so that original equipment manufacturers such as terminal equipment and the like are benefited, the equipment manufacturers are enabled to improve the design cost efficiency, reduce the size and help to shorten the product design period. The low insertion loss performance of this scheme can support long battery life and superior data rates for consumers.
Drawings
Fig. 1 is a schematic structural diagram of a filter component based on combined application of SAW-BAW technologies in this embodiment 2.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
A filter assembly based on combined SAW-BAW technology applications includes a first acoustic filter and a second acoustic filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and a common node.
The first acoustic wave filter and the second acoustic wave filter each include a surface acoustic wave resonator and a bulk acoustic wave resonator connected in series.
The number of bulk acoustic wave resonators in the first acoustic wave filter is greater than twice the number of surface acoustic wave resonators.
The surface acoustic wave resonator includes at least five resonators.
The first acoustic wave filter may further include a parallel bulk acoustic wave resonator coupled to the common node, the parallel bulk acoustic wave resonator being coupled to the surface acoustic wave resonator through a series bulk acoustic wave resonator.
The second acoustic wave filter includes a second surface acoustic wave resonator and a second bulk acoustic wave resonator coupled between the second surface acoustic wave resonator and the common node.
Two additional acoustic wave filters coupled to the common node are also included.
By integrating the latest Bulk Acoustic Wave (BAW) and Surface Acoustic Wave (SAW) filter technologies, extremely small volumes are achieved. This volume advantage helps cell phone manufacturers to produce ultra-thin phones while facilitating the integration of advanced multimedia functions to meet the user's needs. In combination with traditional LC filters and diplexer, multiplexer products to help solve various carrier aggregation configurations deployed by operators and the like to extend the coverage, speed and capacity of gigabit networks to enhance user experience. And the design of carrier aggregation support in the amplifier module can be simplified, so that original equipment manufacturers such as terminal equipment and the like are benefited, the equipment manufacturers are enabled to improve the design cost efficiency, reduce the size and help to shorten the product design period. The low insertion loss performance of this scheme can support long battery life and superior data rates for consumers.
Example 2
Referring to fig. 1, a filter component based on combined application of SAW-BAW technologies in this embodiment includes a TX1 port, an RX1 port, a TX2 port, and an RX2 port connected to a COM port, respectively, where the TX1 port, the RX1 port, the TX2 port, and the RX2 port are all connected in parallel to the COM port through different filter branches, and the filter branches of the TX1 port, the RX1 port, the TX2 port, and the RX2 port all include several SAW resonators and several BAW resonators.
The filter branch circuit with the TX1 port connected with the COM port comprises a SAW resonator I21, a SAW resonator II 23 and a BAW resonator I25 which are sequentially connected in series, a SAW resonator III 22 is connected between the SAW resonator I21 and the SAW resonator II 23 in parallel, a SAW resonator IV 24 is connected between the SAW resonator II 23 and the BAW resonator I25 in parallel, and one end of each of the SAW resonator III 22 and the SAW resonator IV 24 is grounded.
The filter branch circuit with the RX1 port connected with the COM port comprises a SAW resonator five 31, a SAW resonator six 33 and a BAW resonator two 36 which are sequentially connected in series, a SAW resonator seven 32 is connected between the SAW resonator five 31 and the SAW resonator six 33 in parallel, a SAW resonator eight 34 is connected between the SAW resonator six 33 and the BAW resonator two 36 in parallel, and one end of each of the SAW resonator seven 32 and the SAW resonator eight 34 is grounded.
The filter branch circuit with the TX2 port connected with the COM port comprises a SAW resonator nine 41, a SAW resonator ten 43 and a BAW resonator three 46 which are sequentially connected in series, a SAW resonator eleven 45 is connected between the TX2 port and the SAW resonator nine 41 in parallel, a SAW resonator twelve 42 is connected between the SAW resonator nine 41 and the SAW resonator ten 43 in parallel, a SAW resonator thirteen 44 is connected between the SAW resonator ten 43 and the BAW resonator three 46 in parallel, a BAW resonator four 47 is connected between the BAW resonator three 46 and the COM port in parallel, and one end of each of the SAW resonator eleven 45, the SAW resonator twelve 42, the SAW resonator thirteen 44 and the BAW resonator four 47 is grounded.
The filter branch circuit connected with the RX2 port and the COM port comprises a SAW resonator fourteen 51, a SAW resonator fifteen 53 and a BAW resonator five 56 which are sequentially connected in series, a SAW resonator sixteen 55 is connected between the RX2 port and the SAW resonator fourteen 51 in parallel, a SAW resonator seventeen 52 is connected between the SAW resonator fourteen 51 and the SAW resonator fifteen 53 in parallel, a SAW resonator eighteen 54 is connected between the SAW resonator fifteen 53 and the BAW resonator five 56 in parallel, and one end of each of the SAW resonator sixteen 55, the SAW resonator seventeen 52 and the SAW resonator eighteen 54 is grounded.
The series SAW resonators in the acoustic wave filter may be coupled to a common node of the quadplexer through the series BAW resonators. The series SAW resonator and the parallel SAW resonator in the acoustic wave filter may be coupled to a common node of the quadplexer through the series BAW resonator. All SAW resonators of each acoustic wave filter are coupled to a common node through the series BAW resonators of the respective acoustic wave filter. This can reduce the load on the common node relative to an acoustic wave filter including only surface acoustic wave resonators. At least 70% of the resonators of the multiplexer and acoustic wave filter may be SAW resonators, and the other resonators of the multiplexer and acoustic wave filter may be implemented by BAW technology. By implementing an acoustic wave filter using most SAW resonators, such an acoustic wave filter can be cheaper than an acoustic wave filter implemented mostly or entirely by BAW resonators.
The above-mentioned embodiments only express a certain implementation mode of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention; therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A filter assembly based on combined application of SAW-BAW techniques, characterized by: including a first acoustic filter and a second acoustic filter coupled to a common node. The first acoustic wave filter includes a surface acoustic wave resonator and a series bulk acoustic wave resonator coupled between the surface acoustic wave resonator and a common node.
2. A filter assembly based on combined application of SAW-BAW techniques, as claimed in claim 1, wherein: the first acoustic wave filter and the second acoustic wave filter both comprise surface acoustic wave resonators and bulk acoustic wave resonators connected in series.
3. A filter assembly based on combined application of SAW-BAW techniques, as claimed in claim 2, wherein: the number of the bulk acoustic wave resonators in the first acoustic wave filter is more than twice the number of the surface acoustic wave resonators.
4. A filter assembly based on combined application of SAW-BAW techniques, as claimed in claim 2, wherein: the surface acoustic wave resonator includes at least five resonators.
5. A filter assembly based on combined application of SAW-BAW techniques, as claimed in claim 2, wherein: the first acoustic wave filter may further include a parallel bulk acoustic wave resonator coupled to the common node, the parallel bulk acoustic wave resonator being coupled to the surface acoustic wave resonator through a series bulk acoustic wave resonator.
6. A filter assembly based on combined application of SAW-BAW techniques, as claimed in claim 2, wherein: the second acoustic wave filter includes a second surface acoustic wave resonator and a second bulk acoustic wave resonator coupled between the second surface acoustic wave resonator and the common node.
7. A filter assembly based on the combined application of SAW-BAW techniques, as claimed in any one of claims 1-6, wherein: at least two additional acoustic wave filters coupled to the common node are also included.
8. A filter assembly based on the combined application of SAW-BAW techniques, as claimed in any one of claims 1-6, wherein: at least four additional acoustic wave filters are also included that are coupled to the common node.
9. A filter assembly based on the combined application of SAW-BAW techniques, as claimed in any one of claims 1-6, wherein: at least six additional acoustic wave filters coupled to the common node are also included.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010755241.2A CN111934648A (en) | 2020-07-31 | 2020-07-31 | Filter assembly based on SAW-BAW technology combined application |
| PCT/CN2021/081166 WO2022021893A1 (en) | 2020-07-31 | 2021-03-16 | Filter assembly based on combined application of saw and baw technologies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010755241.2A CN111934648A (en) | 2020-07-31 | 2020-07-31 | Filter assembly based on SAW-BAW technology combined application |
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| CN111934648A true CN111934648A (en) | 2020-11-13 |
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| CN202010755241.2A Pending CN111934648A (en) | 2020-07-31 | 2020-07-31 | Filter assembly based on SAW-BAW technology combined application |
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| CN (1) | CN111934648A (en) |
| WO (1) | WO2022021893A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953436A (en) * | 2021-02-08 | 2021-06-11 | 上海师范大学 | SAW-BAW hybrid resonator |
| WO2022021893A1 (en) * | 2020-07-31 | 2022-02-03 | 上海芯波电子科技有限公司 | Filter assembly based on combined application of saw and baw technologies |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983695A (en) * | 2016-10-28 | 2019-07-05 | 天工方案公司 | Acoustic wave filter including two kinds of acoustic resonator |
| CN110380706A (en) * | 2018-04-12 | 2019-10-25 | 天工方案公司 | Filter including two kinds of acoustic resonator |
| CN111200418A (en) * | 2020-01-15 | 2020-05-26 | 诺思(天津)微系统有限责任公司 | Bulk acoustic wave filter and signal processing apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106031076B (en) * | 2014-02-19 | 2020-03-06 | 南加利福尼亚大学 | Filter and duplexer based on miniature acoustic resonator |
| CN111934648A (en) * | 2020-07-31 | 2020-11-13 | 上海芯波电子科技有限公司 | Filter assembly based on SAW-BAW technology combined application |
-
2020
- 2020-07-31 CN CN202010755241.2A patent/CN111934648A/en active Pending
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2021
- 2021-03-16 WO PCT/CN2021/081166 patent/WO2022021893A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983695A (en) * | 2016-10-28 | 2019-07-05 | 天工方案公司 | Acoustic wave filter including two kinds of acoustic resonator |
| CN110380706A (en) * | 2018-04-12 | 2019-10-25 | 天工方案公司 | Filter including two kinds of acoustic resonator |
| CN111200418A (en) * | 2020-01-15 | 2020-05-26 | 诺思(天津)微系统有限责任公司 | Bulk acoustic wave filter and signal processing apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022021893A1 (en) * | 2020-07-31 | 2022-02-03 | 上海芯波电子科技有限公司 | Filter assembly based on combined application of saw and baw technologies |
| CN112953436A (en) * | 2021-02-08 | 2021-06-11 | 上海师范大学 | SAW-BAW hybrid resonator |
| CN112953436B (en) * | 2021-02-08 | 2024-04-30 | 上海师范大学 | SAW-BAW hybrid resonator |
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| Publication number | Publication date |
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| WO2022021893A1 (en) | 2022-02-03 |
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