JPS6482706A - Surface acoustic wave narrow-band filter - Google Patents
Surface acoustic wave narrow-band filterInfo
- Publication number
- JPS6482706A JPS6482706A JP23870287A JP23870287A JPS6482706A JP S6482706 A JPS6482706 A JP S6482706A JP 23870287 A JP23870287 A JP 23870287A JP 23870287 A JP23870287 A JP 23870287A JP S6482706 A JPS6482706 A JP S6482706A
- Authority
- JP
- Japan
- Prior art keywords
- interdigital electrodes
- reflected wave
- surface acoustic
- input
- electrode
- 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.)
- Pending
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
PURPOSE:To reduce the loss and to widen the band by specifying the relation between the center distance between opposite electrode fingers and the wavelength of a surface acoustic wave and the relation between the characteristic impedance discontinuation quantity between the surfaces of an electrode finger part and a no-electrode-finger part and the logarithm of interdigital electrodes for input and output. CONSTITUTION:The peak of an internal reflected wave is made coincident with the reflected wave peak between input and output interdigital electrodes 1 and 2. Namely, an inequality I holds, where (n) is a natural number including 0 and lambda is the wavelength of the surface acoustic wave. Further, when N1 and N2 couples of input and output interdigital electrodes 1 and 2 are provided, let N1 and N2>=n/¦epsilon¦ and N2>=3/2N1, where epsilon is the discontinuation quantity of the characteristic impedance between the surfaces of the electrode finger part and no-electrode-finger part of the interdigital electrodes, and an internal reflected wave is utilized. Consequently, the internal reflected wave peak P1 of the interdigital electrodes 1 and 2 and the reflected wave peak P2 between the input and output interdigital electrodes 1 and 2 are made coincident with each other to reduce the loss and widen the band.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23870287A JPS6482706A (en) | 1987-09-25 | 1987-09-25 | Surface acoustic wave narrow-band filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23870287A JPS6482706A (en) | 1987-09-25 | 1987-09-25 | Surface acoustic wave narrow-band filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6482706A true JPS6482706A (en) | 1989-03-28 |
Family
ID=17034018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23870287A Pending JPS6482706A (en) | 1987-09-25 | 1987-09-25 | Surface acoustic wave narrow-band filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6482706A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02202710A (en) * | 1989-01-31 | 1990-08-10 | Nippon Mining Co Ltd | Surface acoustic wave resonator filter |
JPH03270309A (en) * | 1990-03-19 | 1991-12-02 | Fujitsu Ltd | Multi-electrode structure type surface acoustic wave element |
US5130681A (en) * | 1989-06-05 | 1992-07-14 | Hitachi, Ltd. | Saw filter and mobile telephone using same |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50107840A (en) * | 1974-01-30 | 1975-08-25 | ||
JPS58127426A (en) * | 1982-01-26 | 1983-07-29 | Nec Corp | Surface acoustic wave device |
JPS58141023A (en) * | 1982-02-17 | 1983-08-22 | Nec Corp | Surface acoustic wave device |
JPS5937724A (en) * | 1982-08-26 | 1984-03-01 | Nec Corp | Surface acoustic wave resonator type filter |
JPS61192112A (en) * | 1985-02-20 | 1986-08-26 | Nec Corp | Surface acoustic wave device |
JPS61281612A (en) * | 1985-06-07 | 1986-12-12 | Hitachi Ltd | Surface acoustic wave resonator |
-
1987
- 1987-09-25 JP JP23870287A patent/JPS6482706A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50107840A (en) * | 1974-01-30 | 1975-08-25 | ||
JPS58127426A (en) * | 1982-01-26 | 1983-07-29 | Nec Corp | Surface acoustic wave device |
JPS58141023A (en) * | 1982-02-17 | 1983-08-22 | Nec Corp | Surface acoustic wave device |
JPS5937724A (en) * | 1982-08-26 | 1984-03-01 | Nec Corp | Surface acoustic wave resonator type filter |
JPS61192112A (en) * | 1985-02-20 | 1986-08-26 | Nec Corp | Surface acoustic wave device |
JPS61281612A (en) * | 1985-06-07 | 1986-12-12 | Hitachi Ltd | Surface acoustic wave resonator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02202710A (en) * | 1989-01-31 | 1990-08-10 | Nippon Mining Co Ltd | Surface acoustic wave resonator filter |
US5130681A (en) * | 1989-06-05 | 1992-07-14 | Hitachi, Ltd. | Saw filter and mobile telephone using same |
JPH03270309A (en) * | 1990-03-19 | 1991-12-02 | Fujitsu Ltd | Multi-electrode structure type surface acoustic wave element |
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