CN207664954U - A kind of surface acoustic wave detector - Google Patents
A kind of surface acoustic wave detector Download PDFInfo
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- CN207664954U CN207664954U CN201721740934.4U CN201721740934U CN207664954U CN 207664954 U CN207664954 U CN 207664954U CN 201721740934 U CN201721740934 U CN 201721740934U CN 207664954 U CN207664954 U CN 207664954U
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- interdigital transducer
- interdigital
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- unit
- acoustic wave
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Abstract
The utility model has opened a kind of surface acoustic wave detector.It includes piezoelectric substrate and the first interdigital transducer group and the second interdigital transducer group that are arranged on piezoelectric substrate, first interdigital transducer group and the second interdigital transducer group connect into convex shape structure, first interdigital transducer group includes four concatenated interdigital transducers, second interdigital transducer group includes two interdigital transducers in parallel, interdigital transducer includes the first interdigital transducer unit, it is symmetrically arranged with the second interdigital transducer unit successively in the both sides of the first interdigital transducer unit and battle array is deleted in reflection, first interdigital transducer unit of the interdigital transducer of first interdigital transducer group one end is connected with input electrode, second interdigital transducer unit of the interdigital transducer of the first interdigital transducer group other end is connected with output electrode.The utility model can reduce volume, improve performance.
Description
Technical field
The present invention relates to technical field of communication equipment, more particularly to a kind of surface acoustic wave detector.
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.
Invention content
The invention mainly solves the technical problem of providing a kind of surface acoustic wave detectors, can reduce volume, raising property
Energy.
In order to solve the above technical problems, one aspect of the present invention is：A kind of surface acoustic wave detector is provided,
It is described including piezoelectric substrate and the first interdigital transducer group and the second interdigital transducer group that are arranged on the piezoelectric substrate
First interdigital transducer group and the second interdigital transducer group connect into convex shape structure, and the first interdigital transducer group includes four
A concatenated interdigital transducer, the second interdigital transducer group include two interdigital transducers in parallel, the interdigital transducing
Device includes the first interdigital transducer unit, and it is interdigital to be symmetrically arranged with second successively in the both sides of the first interdigital transducer unit
Battle array, the first interdigital transducer unit of the interdigital transducer of described first interdigital transducer group one end are deleted in transducer unit and reflection
It is connected with input electrode, the second interdigital transducer unit connection of the interdigital transducer of the first interdigital transducer group other end
There is output electrode, the spacing between the first interdigital transducer unit and the second interdigital transducer unit is described first
The wavelength of interdigital transducer unit.
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 the interdigital transducer.
The beneficial effects of the invention are as follows：The case where being different from the prior art, the present invention form convex shape structure by setting
Two interdigital transducer groups, interdigital transducer group includes four concatenated interdigital transducers, another interdigital transducer
Group includes two interdigital transducers in parallel, and since the quantity of interdigital transducer is few, thickness is small, so as to reduce volume, carry
High-performance.
Description of the drawings
Fig. 1 is the structural schematic diagram of surface acoustic wave detector provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Refering to fig. 1, it is the structural schematic diagram of surface acoustic wave detector provided in an embodiment of the present invention, the embodiment of the present invention
Surface acoustic wave detector includes piezoelectric substrate 10 and the first interdigital transducer group 20 and second being arranged on piezoelectric substrate 10
Interdigital transducer group 30.
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.
Interdigital transducer 11 include the first interdigital transducer unit 111, the both sides of the first interdigital transducer unit 111 according to
Sub-symmetry is provided with the second interdigital transducer unit 112 and battle array 113, interdigital the changing of 20 one end of the first interdigital transducer group are deleted in reflection
Can the first interdigital transducer unit 111 of device 11 be connected with input electrode 40,20 other end of the first interdigital transducer group it is interdigital
Second interdigital transducer unit 112 of energy converter 11 is connected with output electrode 50, the first interdigital transducer unit 111 and second fork
Spacing between finger transducer unit 112 is the wavelength of the first interdigital transducer unit 111, the first interdigital transducer unit 111
It is identical with the synchronizing frequency of the second interdigital transducer unit 112, synchronizing frequency and the wavelength of the first interdigital transducer unit 111
Relationship is：V=λ × f, wherein v is the spread speed of sound in the material, and f is synchronizing frequency, and λ is wavelength.In the present embodiment
In, the half-wavelength of reflecting grating 113 is equal to the half-wavelength of interdigital transducer 11.
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 surface acoustic wave detector stopband performance, and due to the thickness of interdigital transducer 11
Spend small, usage quantity is few, thus can reduce volume.
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 surface acoustic wave detector has lower insertion damage in wider free transmission range
Consumption.
At work, ac voltage signal load is in input electrode 40 and output electricity for the surface acoustic wave detector of the present embodiment
On pole 50 so that each interdigital filter 11 excites two-way surface acoustic wave, and reflection is deleted 113 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 113.
Surface acoustic wave detector provided in this embodiment shortens the spacing between interdigital transducer, shortens resonant cavity,
So that the energy of interdigital resonator is more concentrated, therefore detection sensitivity can be improved.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (3)
1. a kind of surface acoustic wave detector, which is characterized in that including piezoelectric substrate and be arranged on the piezoelectric substrate
One interdigital transducer group and the second interdigital transducer group, the first interdigital transducer group and the second interdigital transducer group connect into
Convex shape structure, the first interdigital transducer group include four concatenated interdigital transducers, the second interdigital transducer group
Including two interdigital transducers in parallel, the interdigital transducer includes the first interdigital transducer unit, interdigital described first
The both sides of transducer unit are symmetrically arranged with the second interdigital transducer unit successively and battle array, first interdigital transducer are deleted in reflection
First interdigital transducer unit of the interdigital transducer of group one end is connected with input electrode, and the first interdigital transducer group is another
Second interdigital transducer unit of the interdigital transducer at end is connected with output electrode, the first interdigital transducer unit with it is described
Spacing between second interdigital transducer unit is the wavelength of the first interdigital transducer unit.
2. surface acoustic wave detector according to claim 1, which is characterized in that the piezoelectric substrate is by niobic acid lithium material system
At.
3. surface acoustic wave detector according to claim 1, which is characterized in that the half-wavelength for deleting battle array that reflects is equal to institute
State the half-wavelength of interdigital transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721740934.4U CN207664954U (en) | 2017-12-14 | 2017-12-14 | A kind of surface acoustic wave detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721740934.4U CN207664954U (en) | 2017-12-14 | 2017-12-14 | A kind of surface acoustic wave detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207664954U true CN207664954U (en) | 2018-07-27 |
Family
ID=62941385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721740934.4U Expired - Fee Related CN207664954U (en) | 2017-12-14 | 2017-12-14 | A kind of surface acoustic wave detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207664954U (en) |
-
2017
- 2017-12-14 CN CN201721740934.4U patent/CN207664954U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180727 Termination date: 20181214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |