CN202218205U - Sawf - Google Patents
Sawf Download PDFInfo
- Publication number
- CN202218205U CN202218205U CN2011202308536U CN201120230853U CN202218205U CN 202218205 U CN202218205 U CN 202218205U CN 2011202308536 U CN2011202308536 U CN 2011202308536U CN 201120230853 U CN201120230853 U CN 201120230853U CN 202218205 U CN202218205 U CN 202218205U
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- CN
- China
- Prior art keywords
- filter
- saw filter
- transducers
- substrate
- mhz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 238000007667 floating Methods 0.000 claims abstract description 4
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000004891 communication Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000010897 surface acoustic wave method Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction 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
- 238000001914 filtration Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The utility model relates to an SAWF (Surface Acoustic Wave Filter), comprising a 42-degree lithium niobate substrate, wherein the substrate is provided with two energy transducers thereon, and the two energy transducers are coupled to each other to form a plurality of floating electrode antisymmetric series structures. The filter has a centre frequency from 389.5 to 390.5 MHz, a -1dB bandwidth from 12.74 to 14.15 MHz, and a -40dB bandwidth from 31.8 to 32.0 MHz, thus the filter satisfies requirements of low loss (IL <= 2.0), high rectangular degree (2.25), and miniaturized structure (5*5mm), and can be applied to occasions for realizing adjacent frequency transmission in a cable television system, realizing signal receiving and processing in wireless communication, etc.
Description
[technical field]
The utility model relates to a kind of SAW filter.
[background technology]
When the crystal with piezoelectric effect receives mechanism, with the phenomenon that produces the electric field that is directly proportional with pressure; Crystal with piezoelectric effect when receiving action of electric signals, also can produce 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.
SAW filter (SAWF) is to adopt piezoelectrics such as quartz crystal, piezoelectric ceramic; A kind of filtering dedicated devices that utilizes the physical characteristic of its piezoelectric effect and acoustic surface wave propagation and process; It is little to have volume; In light weight, dependable performance, do not need advantage such as complicated adjustment, be widely used in television set and the video tape recorder intermediate-frequency circuit, with replacement LC intermediate-frequency filter; The quality of image, sound is improved greatly, also is to realize in the cable television system adjacently keeping pouring in that signal receives the Primary Component of handling in defeated, the radio communication.
There is following shortcoming at least in SAW filter of the prior art: shortcomings such as the insertion loss of filter is big, the rectangle degree is low, volume structure is big.
[summary of the invention]
The purpose of the utility model provides a kind of SAW filter that loss is low, the rectangle degree high, volume structure is little that inserts.
The purpose of the utility model realizes through following technical scheme:
The described SAW filter of the utility model comprises substrate, and said substrate is provided with two transducers, and said two transducers intercouple and form the anti-cascaded structure of claiming of a plurality of floating electrodes.
Technical scheme by above-mentioned the utility model provides can be found out; SAW filter of the present invention; Formation is a plurality of because on-chip two transducers intercouple, and can reduce the wastage, and improves the rectangle degree; The insertion loss of whole filter is reduced, and the rectangle degree improves, the device volume structure is dwindled.(5 * 5mm) requirement can be applicable to realize in the cable television system that the neighbour keeps pouring in that signal receives occasions such as processing in defeated, the radio communication to satisfy low-loss (IL≤2.0), high rectangle degree (2.25), miniaturization structure.
[description of drawings]
Fig. 1 is the structure principle chart of the utility model SAW filter
Fig. 2 is the encapsulating structure sketch map of the utility model SAW filter
Fig. 3 is typical frequency response figure of the utility model SAW filter
Wherein, 1,3,4,5,7,8 ground pin, 2,6 input pin and output pins, 11,12 transducers, 13-floats the anti-cascaded structure of claiming of electrode.
[embodiment]
The SAW filter of the utility model; Its preferable embodiment is as shown in Figure 1, comprises that substrate (not marking among the figure), substrate are provided with 11,12, two transducers 11,12 of two transducers and intercouple and form the anti-cascaded structure 13 of claiming of a plurality of floating electrodes; Thereby can reduce the wastage; Improve the rectangle degree, the insertion loss of whole filter is reduced, the rectangle degree improves, the device volume structure is dwindled.
Substrate can be 42 ° of lithium niobate substrates, and promptly substrate is a material with 42 ° of lithium niobates (42LT), and its temperature coefficient is 32ppm/ ℃, and the coupling coefficient of transducer 11,12 and 42LT is big, can further realize low-loss.Also can select other material as required for use.
Shown in Fig. 2 a, 2b, the utility model comprises encapsulating structure, and 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 SMD5 * 5 encapsulation.
The SAW filter of the utility model, this filter can be the filter of 389.5-390.5MHz for centre frequency, also can for-the 1dB bandwidth is the filter of 12.74-14.15MHz; Also can for-the 40dB bandwidth is the filter of 31.8-32.0MHz; (5 * 5mm) requirement can be applicable to realize in the cable television system that the neighbour keeps pouring in that signal receives occasions such as processing in defeated, the radio communication to satisfy low-loss (IL≤2.0), high rectangle degree (2.25), miniaturization structure.
The electric parameter of a specific embodiment, as shown in table 1:
The electric parameter of table 1, specific embodiment
Claims (9)
1. a SAW filter comprises substrate, it is characterized in that said substrate is provided with two transducers (11,12), and said two transducers (11,12) intercouple and form the anti-cascaded structure (13) of claiming of a plurality of floating electrodes.
2. a kind of SAW filter as claimed in claim 1 is characterized in that said substrate is 42 ° of lithium niobate substrates.
3. according to claim 1 or claim 2 a kind of SAW filter is characterized in that described filter is that centre frequency is the filter of 389.5-390.5MHz.
4. according to claim 1 or claim 2 a kind of SAW filter, it is characterized in that described filter for-the 1dB bandwidth is the filter of 12.74-14.15MHz.
5. according to claim 1 or claim 2 a kind of SAW filter, it is characterized in that described filter for-the 40dB bandwidth is the filter of 31.8-32.0MHz.
6. according to claim 1 or claim 2 a kind of SAW filter; It is characterized in that also comprising encapsulating structure; Said encapsulating structure is provided with input pin and output pin (2,6), and said input pin is connected with said two transducers (11,12) respectively with output pin (2,6).
7. a kind of SAW filter as claimed in claim 6; It is characterized in that said encapsulating structure is provided with a plurality of grounding pins (1,3,4,5,7,8), said two transducers (11,12) are connected with at least one grounding pin (1,3,4,5,7,8) respectively.
8. a kind of SAW filter as claimed in claim 6 is characterized in that said encapsulating structure is a surface mount device.
9. a kind of SAW filter as claimed in claim 7 is characterized in that said encapsulating structure is a surface mount device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202308536U CN202218205U (en) | 2011-07-01 | 2011-07-01 | Sawf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202308536U CN202218205U (en) | 2011-07-01 | 2011-07-01 | Sawf |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202218205U true CN202218205U (en) | 2012-05-09 |
Family
ID=46017430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202308536U Expired - Lifetime CN202218205U (en) | 2011-07-01 | 2011-07-01 | Sawf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202218205U (en) |
-
2011
- 2011-07-01 CN CN2011202308536U patent/CN202218205U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Full-automatic testing, sorting and packaging system for surface acoustic wave filter device Effective date of registration: 20171025 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co., Ltd. Pledgor: Xian Leixun Science & Technology Co., Ltd. Registration number: 2017610000129 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20190108 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co., Ltd. Pledgor: Xian Leixun Science & Technology Co., Ltd. Registration number: 2017610000129 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Full-automatic testing, sorting and packaging system for surface acoustic wave filter device Effective date of registration: 20190111 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co., Ltd. Pledgor: Xian Leixun Science & Technology Co., Ltd. Registration number: 2019610000007 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20200115 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co., Ltd. Pledgor: Xian Leixun Science & Technology Co., Ltd. Registration number: 2019610000007 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Full-automatic testing, sorting and packaging system for surface acoustic wave filter device Effective date of registration: 20200120 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co., Ltd. Pledgor: Xian Leixun Science & Technology Co., Ltd. Registration number: Y2020610000018 |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Yu Ping Document name: payment instructions |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210507 Granted publication date: 20120509 Pledgee: Xi'an Guoxin micro credit Co.,Ltd. Pledgor: XI'AN LEIXUN ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2020610000018 |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120509 |