CN207664956U - A kind of SAW filter - Google Patents
A kind of SAW filter Download PDFInfo
- Publication number
- CN207664956U CN207664956U CN201721749623.4U CN201721749623U CN207664956U CN 207664956 U CN207664956 U CN 207664956U CN 201721749623 U CN201721749623 U CN 201721749623U CN 207664956 U CN207664956 U CN 207664956U
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- CN
- China
- Prior art keywords
- interdigital transducer
- interdigital
- transducer group
- bus
- group
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The utility model discloses a kind of SAW filters.It includes piezoelectric substrate and the first interdigital transducer group being arranged on piezoelectric substrate,Second interdigital transducer group and multiple reflecting gratings,Two interdigital transducer groups connect into convex shape structure,First interdigital transducer group includes four concatenated interdigital transducers,Second interdigital transducer group includes two interdigital transducers in parallel,The both sides of each interdigital transducer are provided with reflecting grating,The thickness of interdigital transducer in first interdigital transducer group is more than the thickness of the interdigital transducer of the second interdigital transducer group,Interdigital transducer includes two bus-bars and Duo Gen electrode strips,More electrode strips are apart from one another by being staggered and be electrically connected with the bus-bar of both sides,One end of reflecting grating is electrically connected with the bus-bar of adjacent interdigital transducer,The bus-bar of the interdigital transducer at the first interdigital transducer group both ends is connected separately with input electrode and output electrode.The utility model can reduce volume, improve performance.
Description
Technical field
The utility model is related to technical field of communication equipment, more particularly to a kind of SAW filter.
Background technology
Surface acoustic wave is a kind of elastic wave propagated along body surface.SAW filter has at low cost, small
The features such as more with function, is applied widely in fields such as radar, navigation, identifications, with the continuous hair of mobile communication technology
Exhibition, in following communication system, super large broadband, low-loss filter have huge application demand.
But current SAW filter mostly uses greatly LC filters, volume is larger, and selectivity is also bad, limitation
The miniaturization of electronic system and high-performance development.
Utility model content
The utility model can reduce volume, carry mainly solving the technical problems that provide a kind of SAW filter
High-performance.
In order to solve the above technical problems, the technical solution that the utility model uses is：A kind of surface acoustic wave filter is provided
Wave device, including piezoelectric substrate and the first interdigital transducer group, the second interdigital transducer group that are arranged on the piezoelectric substrate
With multiple reflecting gratings, the first interdigital transducer group and the second interdigital transducer group connect into convex shape structure, and described first
Interdigital transducer group includes four concatenated interdigital transducers, and the second interdigital transducer group includes two and in parallel interdigital changes
Can device, the both sides of each interdigital transducer are provided with the reflecting grating, and interdigital in the first interdigital transducer group is changed
The thickness of energy device is more than the thickness of the interdigital transducer of the second interdigital transducer group, and the interdigital transducer includes two remittances
Stream row and more electrode strips, described two bus-bars are set to the both sides of the more electrode strips, and the more electrode strips are mutual
Interleaved is arranged and is electrically connected with two bus-bars, the confluence of one end of the reflecting grating and the adjacent interdigital transducer
Row's electrical connection, the bus-bar of the interdigital transducer at the first interdigital transducer group both ends are connected separately with input electrode and output
Electrode.
Preferably, the piezoelectric substrate is made of niobic acid lithium material.
Preferably, the half-wavelength of the reflecting grating is equal to the half-wavelength of interdigital transducer.
The utility model has the beneficial effects that：The case where being different from the prior art, the utility model are formed convex by setting
Two interdigital transducer groups of character form structure, and the thickness of the interdigital transducer of two interdigital transducer groups is different, so as to
Enough reduce volume, improve performance, and can ensure the low insertion loss of passband, avoids the influence of spurious response.
Description of the drawings
Fig. 1 is the structural schematic diagram for the SAW filter that the utility model embodiment provides.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Refering to fig. 1, it is the structural schematic diagram for the SAW filter that the utility model embodiment provides, the utility model
The SAW filter of embodiment includes piezoelectric substrate 10 and the first interdigital transducer group being arranged on piezoelectric substrate 10
20, the second interdigital transducer group 30 and multiple reflecting gratings 40.
First interdigital transducer group 20 and the second interdigital transducer group 30 connect into convex shape structure, the first interdigital transducer
Group 20 includes four concatenated interdigital transducers 11, and the second interdigital transducer group 30 includes two interdigital transducers 11 in parallel,
The both sides of each interdigital transducer 11 are provided with reflecting grating 40, the thickness of the interdigital transducer 11 in the first interdigital transducer group 20
More than the thickness of the interdigital transducer 11 of the second interdigital transducer group 30.
Interdigital transducer 11 includes two bus-bars 111 and Duo Gen electrode strips 112, and bus-bar 111 is set to more electrodes
The both sides of item 112, more electrode strips 112 are apart from one another by being staggered and be electrically connected with two bus-bars 111, the one of reflecting grating 40
End is electrically connected with the bus-bar 111 of adjacent interdigital transducer 11, the interdigital transducer 11 at 20 both ends of the first interdigital transducer group
Bus-bar 111 be connected separately with input electrode 50 and output electrode 60.In the present embodiment, the half-wavelength of reflecting grating 40 is equal to
The half-wavelength of interdigital transducer 11.It refers to two neighboring electrode strip that 40 half-wavelength and the half-wavelength of interdigital transducer 11 are deleted in reflection
112 center spacing.
Since the first interdigital transducer group 20 and the second interdigital transducer group 30 connect into convex shape structure, and convex shape knot
The stopband rejection of structure is superior, it is ensured that SAW filter stopband performance, and due to the thickness of interdigital transducer 11
Spend small, usage quantity is few, thus can reduce volume.Also, due to the interdigital transducer 11 in the first interdigital transducer group 20
Thickness be more than the second interdigital transducer group 30 interdigital transducer 11 thickness, spurious mode can be eliminated, and utilize thickness
Gap, further the broadband of SAW filter is widened, reduces its resistance loss, finally improves its performance.
In the present embodiment, piezoelectric substrate 10 is made of niobic acid lithium material.The electromechanical coupling factor of niobic acid lithium material is big, has
Conducive to the transmission of passband signal, it is ensured that SAW filter has lower insertion damage in wider free transmission range
Consumption.
At work, ac voltage signal load is in first electrode 50 and the second electricity for the SAW filter of the present embodiment
On pole 60 so that each interdigital filter 11 excites two-way surface acoustic wave, and reflection is deleted 40 and received it after the surface acoustic wave
It reflects back, to realize the transmission of surface acoustic wave.Interdigital filter 11 is very sensitive to frequency, and ac voltage signal is converted
For the mechanical oscillation of piezoelectric substrate 10, and then surface acoustic wave is formed, and is reflected by reflecting grating 40.
The above description is only the embodiments of the present invention, and it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are equally included in the patent within the scope of the utility model.
Claims (3)
1. a kind of SAW filter, which is characterized in that including piezoelectric substrate and be arranged on the piezoelectric substrate
One interdigital transducer group, the second interdigital transducer group and multiple reflecting gratings, the first interdigital transducer group and second interdigital are changed
Can device group connect into convex shape structure, the first interdigital transducer group includes four concatenated interdigital transducers, described second
Interdigital transducer group includes two interdigital transducers in parallel, and the both sides of each interdigital transducer are provided with the reflection
Grid, the thickness of the interdigital transducer in the first interdigital transducer group are more than the interdigital transducing of the second interdigital transducer group
The thickness of device, the interdigital transducer include two bus-bars and Duo Gen electrode strips, and described two bus-bars are set to described more
The both sides of root electrode strip, the more electrode strips are apart from one another by being staggered and be electrically connected with two bus-bars, the reflecting grating
One end be electrically connected with the bus-bar of the adjacent interdigital transducer, the interdigital transducing at the first interdigital transducer group both ends
The bus-bar of device is connected separately with input electrode and output electrode.
2. SAW filter according to claim 1, which is characterized in that the piezoelectric substrate is by niobic acid lithium material system
At.
3. SAW filter according to claim 1, which is characterized in that the half-wavelength of the reflecting grating is equal to interdigital
The half-wavelength of energy converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749623.4U CN207664956U (en) | 2017-12-14 | 2017-12-14 | A kind of SAW filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749623.4U CN207664956U (en) | 2017-12-14 | 2017-12-14 | A kind of SAW filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207664956U true CN207664956U (en) | 2018-07-27 |
Family
ID=62941237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721749623.4U Expired - Fee Related CN207664956U (en) | 2017-12-14 | 2017-12-14 | A kind of SAW filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207664956U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839645A (en) * | 2021-11-26 | 2021-12-24 | 深圳新声半导体有限公司 | Method for improving out-of-band rejection of bulk acoustic wave filter and filter structure |
-
2017
- 2017-12-14 CN CN201721749623.4U patent/CN207664956U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839645A (en) * | 2021-11-26 | 2021-12-24 | 深圳新声半导体有限公司 | Method for improving out-of-band rejection of bulk acoustic wave filter and filter structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190925 Address after: Room 419, 4th Floor, East Gate, Building 1, Jinshi Park, 368 Xinshibei Road, Shijiazhuang City, Hebei Province, 050000 Patentee after: Hebei Xingtian Electronic Technology Co., Ltd. Address before: 610041 Sichuan Province, Chengdu Tianfu Street 69 No. 1 Building 1 unit 16 floor No. 1610 Patentee before: Sichuan nine ancient cooking vessel intelligence intellectual property operation far away Co., Ltd |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180727 Termination date: 20201214 |