CN101515793B - Surface acoustic wave filter - Google Patents
Surface acoustic wave filter Download PDFInfo
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- CN101515793B CN101515793B CN2009100762625A CN200910076262A CN101515793B CN 101515793 B CN101515793 B CN 101515793B CN 2009100762625 A CN2009100762625 A CN 2009100762625A CN 200910076262 A CN200910076262 A CN 200910076262A CN 101515793 B CN101515793 B CN 101515793B
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- acoustic wave
- surface acoustic
- wave filter
- transducers
- transducer
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 12
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 3
- 230000001629 suppression Effects 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The invention discloses a surface acoustic wave filter, comprising a 41-degree lithium niobate substrate provided with two transducers, wherein the two transducers are mutually connected into a two-stage cascade structure, and the transducer is provided with a reflecting grating array area and a transducer area. The center frequency of the wave filter is 158.8 to 159.2 MHz, the bandwidth of -3dB is 8 to 8.5 KHz, and the bandwidth of -40dB is 27 to 29.5 MHz. The surface acoustic wave filter has low loss and high out-of-band suppression, which can accord with the requirements of navigable shipping management or application on other occasions.
Description
Technical field
The present invention relates to a kind of Surface Acoustic Wave Filter, relate in particular to a kind of LX15901 type Surface Acoustic Wave Filter.
Background technology
When the crystal with piezoelectric effect is subjected to mechanism, the phenomenon of the electric field that is directly proportional with pressure will be produced; Crystal with piezoelectric effect when being subjected to action of electric signals, also can producing elastic deformation and sends mechanical wave (sound wave), can transfer the signal of telecommunication to acoustical signal.Because this sound wave is only propagated at plane of crystal, so be called surface acoustic wave.
Surface Acoustic Wave Filter (SAWF) has that volume is little, in light weight, dependable performance, do not need the complicated advantage of adjusting, and is that signal receives the Primary Component of handling in the radio communication.
There is following shortcoming at least in SAW (Surface Acoustic Wave) device of the prior art: the insertion loss of filter is big, band is outer suppresses low.
Summary of the invention
Low, the high LX15901 type Surface Acoustic Wave Filter of the outer inhibition of band of insertion loss that the purpose of this invention is to provide a kind of filter.
The objective of the invention is to be achieved through the following technical solutions:
LX15901 type Surface Acoustic Wave Filter of the present invention comprises substrate, and described substrate is provided with two transducers, and described two transducers are interconnected to the two-stage cascade structure.
As seen from the above technical solution provided by the invention, LX15901 type Surface Acoustic Wave Filter of the present invention because on-chip two transducers are interconnected to the two-stage cascade structure, can reduce loss, the insertion loss of whole filter is reduced, and improved the outer inhibition of band.
Description of drawings
Fig. 1 is the structure principle chart of LX15901 type Surface Acoustic Wave Filter of the present invention;
Fig. 2 a, Fig. 2 b are the encapsulating structure schematic diagram of LX15901 type Surface Acoustic Wave Filter of the present invention;
Fig. 2 b is that the A of Fig. 2 a is to structural representation.
Embodiment
LX15901 type Surface Acoustic Wave Filter of the present invention, its preferable embodiment as shown in Figure 1, comprise that substrate (not marking among the figure), substrate are provided with two transducers 9,10, two transducers 9,10 are interconnected to the two-stage cascade structure, two transducers can parallel with one anotherly connect, or be connected in series etc.Transducer 9,10 is provided with reflecting grating array zone 11 and transducer area 12, can reduce loss, and the insertion loss of whole filter is reduced, and has improved the outer inhibition of band.
Substrate can be 41 ° of lithium niobate substrates, and promptly substrate is a material with 41 ° of lithium niobates, also can select other material as required for use.
Shown in Fig. 2 a, Fig. 2 b, the present invention includes encapsulating structure, encapsulating structure is provided with input pin 2 and output pin 6, can also be provided with a plurality of ground pin 1,3,4,5,7,8.Encapsulating structure is a surface mount device, can adopt Surface Mount SMD5X5 encapsulation.
LX15901 type Surface Acoustic Wave Filter of the present invention, this filter can be the filter of 158.8～159.2MHz for centre frequency; Also can for-three dB bandwidth is the filter of 8～8.5KHz; Also can for-the 40dB bandwidth is the filter of 27～29.5MHz.
Adopt optimized Algorithm, the electrode structure of designing filter; Adopt two-stage cascade, improved the outer inhibition of band; Reduce the aperture, reduced loss, in addition, between the transducer, do not had sudden change between transducer and the reflecting grating at interval, reduced the bulk wave scattering loss, further reduced loss; Low-loss, high-band suppress outward, can the navigation channel watercraft control or the requirement of other applications.
The electric parameter of a specific embodiment, as shown in table 1:
The electric parameter of table 1, specific embodiment
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (4)
1. a Surface Acoustic Wave Filter comprises substrate, it is characterized in that, described substrate is provided with two transducers, and described two transducers are interconnected to the two-stage cascade structure;
Described substrate is 41 ° of lithium niobate substrates;
Also comprise encapsulating structure, described encapsulating structure is provided with input pin and output pin, and described input pin is connected with described two transducers respectively with output pin;
Described encapsulating structure is provided with a plurality of ground pin, and described two transducers are connected with at least one ground pin respectively;
This filter for-three dB bandwidth is the filter of 8～8.5KHz.
2. Surface Acoustic Wave Filter according to claim 1 is characterized in that, described two transducers are connected in series mutually.
3. Surface Acoustic Wave Filter according to claim 2 is characterized in that described transducer is provided with reflecting grating array zone and transducer area.
4. Surface Acoustic Wave Filter according to claim 1 is characterized in that, described encapsulating structure is a surface mount device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100762625A CN101515793B (en) | 2009-01-08 | 2009-01-08 | Surface acoustic wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100762625A CN101515793B (en) | 2009-01-08 | 2009-01-08 | Surface acoustic wave filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101515793A CN101515793A (en) | 2009-08-26 |
| CN101515793B true CN101515793B (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100762625A Active CN101515793B (en) | 2009-01-08 | 2009-01-08 | Surface acoustic wave filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN101515793B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253874A (en) * | 2016-09-22 | 2016-12-21 | 深圳华远微电科技有限公司 | A kind of RFID chip based on SAW resonator and encapsulating structure thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158026A (en) * | 1996-05-28 | 1997-08-27 | 富士通株式会社 | Surface-acoustic-wave device having improved pass-band characteristic and improved degree of freedom for setting input and output impedances |
| CN1274198A (en) * | 1999-05-14 | 2000-11-22 | 中国科学院声学研究所 | Low-insertion-loss acoustic surface wave filter for pager |
-
2009
- 2009-01-08 CN CN2009100762625A patent/CN101515793B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158026A (en) * | 1996-05-28 | 1997-08-27 | 富士通株式会社 | Surface-acoustic-wave device having improved pass-band characteristic and improved degree of freedom for setting input and output impedances |
| CN1274198A (en) * | 1999-05-14 | 2000-11-22 | 中国科学院声学研究所 | Low-insertion-loss acoustic surface wave filter for pager |
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| Publication number | Publication date |
|---|---|
| CN101515793A (en) | 2009-08-26 |
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Denomination of invention: Three-channel surface acoustic wave filter Effective date of registration: 20120828 Granted publication date: 20110615 Pledgee: Industrial Commercial Bank of China Ltd Zhongguancun Beijing branch Pledgor: Beijing Zhongxun Sifang Science and Technology Co., Ltd. Registration number: 2012990000472 |
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Date of cancellation: 20131213 Granted publication date: 20110615 Pledgee: Industrial Commercial Bank of China Ltd Zhongguancun Beijing branch Pledgor: Beijing Zhongxun Sifang Science and Technology Co., Ltd. Registration number: 2012990000472 |
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Denomination of invention: Three-channel surface acoustic wave filter Effective date of registration: 20131213 Granted publication date: 20110615 Pledgee: Industrial Commercial Bank of China Ltd Zhongguancun Beijing branch Pledgor: Beijing Zhongxun Sifang Science and Technology Co., Ltd. Registration number: 2013990000973 |
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Date of cancellation: 20160607 Granted publication date: 20110615 Pledgee: Industrial Commercial Bank of China Ltd Zhongguancun Beijing branch Pledgor: Beijing Zhongxun Sifang Science and Technology Co., Ltd. Registration number: 2013990000973 |
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