KR970077983A - Coupled double mode surface acoustic wave filter - Google Patents
Coupled double mode surface acoustic wave filter Download PDFInfo
- Publication number
- KR970077983A KR970077983A KR1019960015292A KR19960015292A KR970077983A KR 970077983 A KR970077983 A KR 970077983A KR 1019960015292 A KR1019960015292 A KR 1019960015292A KR 19960015292 A KR19960015292 A KR 19960015292A KR 970077983 A KR970077983 A KR 970077983A
- Authority
- KR
- South Korea
- Prior art keywords
- surface acoustic
- acoustic wave
- interdigital transducers
- substrate
- wave filter
- Prior art date
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
본 발명은 종결합 이중 모드 표면 탄성파(SAW: Surface Acoustic Wave) 필터에 관한 것으로서, 특히 대역폭을 조절할 수 있으며, 형상 인자를 개선할 수 있는 종결합 이중 모드 표면 탄성파 필터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a longitudinally coupled dual mode surface acoustic wave (SAW) filter, and more particularly, to a longitudinally coupled dual mode surface acoustic wave filter capable of adjusting a bandwidth and improving a shape factor.
본 발명의 종결합 이중 모드 표면 탄성파 필터는 표면 탄성파를 전파하기 위한 물질로 구성된 기판 ; 상기 기판 상에 전기적인 입력신호를 표면 탄성파로 변환하기 위한 복수의 입력 인터디지탈 트랜스듀서 ; 상기 기판 상에 상기 복수의 인터디지탈 트랜스듀서 각각의 양 측면에 위치하며, 발생한 표면 탄성파를 수신하기 위한 복수의 출력 인터디지탈 트랜스듀서 ; 상기 기판 상에 상기 복수의 출력 인터디지탈 트랜스듀서 양측에 위치하여 상기 복수의 입력 인터디지탈 트랜스듀서에서 발생한 표면탄성파를 다중 반사하는 반사기 ; 및 상기 각 입력 인터디지탈 트랜스듀서와 각 출력 인터디지탈 트랜스듀서 사이에 위치하여 전기적인 입력신호에 의해 발생된 표면파를 인터디지탈 트랜스듀서 사이에서 일부 반사하는 그레이팅 반사기를 구비한 것을 특징으로 한다.The longitudinally coupled dual mode surface acoustic wave filter of the present invention comprises a substrate composed of a material for propagating a surface acoustic wave; A plurality of input interdigital transducers for converting electrical input signals to surface acoustic waves on the substrate; A plurality of output interdigital transducers on both sides of each of the plurality of interdigital transducers on the substrate for receiving surface acoustic waves generated; A reflector for reflecting the surface acoustic waves generated from the plurality of input interdigital transducers on both sides of the plurality of output interdigital transducers on the substrate; And a grating reflector disposed between each input interdigital transducer and each output interdigital transducer for partially reflecting surface waves generated by an electrical input signal between the interdigital transducers.
따라서 본 발명은 IDT 사이에 주기적으로 배치한 그레이팅 반사기의 수를 조절함으로서 대역 통과 필터의 대역폭을 조절할 수 있으며, 그레이팅 반사기의 적절한 배치로 형상 인자를 개선할 수 있다.Therefore, the present invention can adjust the bandwidth of the bandpass filter by adjusting the number of grating reflectors disposed periodically between the IDTs, and improve the shape factor by proper arrangement of the grating reflectors.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.
제 3 도는 본 발명에 따른 반사형 종결합 이중 모드 SAW 필터의 기본 구성을 보인 도면, 제 4 도는 본 발명에 따른 반사형 종결합 이중 모드 SAW 필터를 상하 2단으로 연결한 구조를 보인 도면.FIG. 3 is a view showing a basic configuration of a reflective type longitudinally coupled double mode SAW filter according to the present invention; FIG. 4 is a view showing a structure in which a reflective type longitudinally coupled dual mode SAW filter according to the present invention is connected in two upper and lower stages;
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960015292A KR970077983A (en) | 1996-05-10 | 1996-05-10 | Coupled double mode surface acoustic wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960015292A KR970077983A (en) | 1996-05-10 | 1996-05-10 | Coupled double mode surface acoustic wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR970077983A true KR970077983A (en) | 1997-12-12 |
Family
ID=66219920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960015292A KR970077983A (en) | 1996-05-10 | 1996-05-10 | Coupled double mode surface acoustic wave filter |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR970077983A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020095121A (en) * | 2001-06-12 | 2002-12-20 | 가부시키가이샤 무라타 세이사쿠쇼 | Longitudinally-coupled resonator surface-acoustic-wave filter and communication apparatus using the same |
| KR20030034635A (en) * | 2001-10-26 | 2003-05-09 | 엘지이노텍 주식회사 | A surface acoustic wave filter for dual band and a Manufacturing Method |
-
1996
- 1996-05-10 KR KR1019960015292A patent/KR970077983A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020095121A (en) * | 2001-06-12 | 2002-12-20 | 가부시키가이샤 무라타 세이사쿠쇼 | Longitudinally-coupled resonator surface-acoustic-wave filter and communication apparatus using the same |
| KR20030034635A (en) * | 2001-10-26 | 2003-05-09 | 엘지이노텍 주식회사 | A surface acoustic wave filter for dual band and a Manufacturing Method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5485052A (en) | Three electrode type saw longitudinal coupling filter | |
| KR970013494A (en) | Surface acoustic wave filter | |
| KR960706715A (en) | Surface Wave Resonators and Double Mode Surface Wave Resonators | |
| KR970013679A (en) | Surface acoustic wave filter | |
| JP2703891B2 (en) | Surface acoustic wave filter | |
| US5896071A (en) | Surface wave device balun resonator filters | |
| KR960036293A (en) | Surface acoustic wave resonator filter | |
| US5426339A (en) | Surface acoustic wave devices with mode changing characteristics | |
| EP1207621A3 (en) | Transversal surface acoustic wave filter | |
| GB1413916A (en) | Acoustic surface-wave devices | |
| KR970077983A (en) | Coupled double mode surface acoustic wave filter | |
| KR920019071A (en) | Surface acoustic wave device for bandpass filter with predetermined passband characteristics and low insertion loss over a wide band | |
| JP3001349B2 (en) | Surface acoustic wave filter | |
| US6147574A (en) | Unidirectional surface acoustic wave transducer and transversal-type saw filter having the same | |
| KR970075827A (en) | Reflection type coupled double mode surface acoustic wave (SAW) filter | |
| JPH03129915A (en) | Surface acoustic wave resonator | |
| JP3137081B2 (en) | Surface acoustic wave filter | |
| KR970077984A (en) | Reflection type coupled double mode surface acoustic wave (SAW) filter | |
| JP2004516703A (en) | Transversal mode coupled resonator filter | |
| JPH08335848A (en) | Surface acoustic wave device | |
| US20090231060A1 (en) | Ladder resonator filter and related system | |
| JPH03295308A (en) | Surface acoustic wave resonator | |
| KR960027264A (en) | Surface acoustic wave filter | |
| JPH09326661A (en) | Surface acoustic wave filter | |
| KR100213376B1 (en) | Saw filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E601 | Decision to refuse application |