| Presentation | 2004/7/15 Observation and Supression of Spurious Wave for DMS SAW Filter Takashi SHIBA, Shinichiro OSAWA, Junichi HAMASAKI, Yuji FUJITA, Takao CHIBA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The double mode IDTs structure on 42deg.Y-X LiTaO3 is selected as our experiment for low loss EGSM filter. We have observed Leaky-SAW radiation pattern at first. SAW radiation patterns are obtained using a heterodyne interferometer-type laser probe method. Two spurious radiation modes are observed in the conventional double-mode structure. First mode wave is traveling toward the almost same direction of the main SAW response on bus-bar edge. Second mode wave is traveling toward the direction 40deg. angle rotated from the main SAW direction. We success to suppress the first sourious mode by using grating structure which reduces the SAW velocity on edge of bus-bar. The first sourious mode wave is not observed and low loss frequency characteristics are measured in new IDT structure. The aperture of grating structure is optimized by testing the various parameters of the structure. Consequently, loss of the filter is improved by the new wave-guide structure. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SAW / Surface Acoustic Wave / Double-Mode / Wave-guide / Observation of SAW |
| Paper # | US2004-24 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2004/7/15(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Observation and Supression of Spurious Wave for DMS SAW Filter |
| Sub Title (in English) | |
| Keyword(1) | SAW |
| Keyword(2) | Surface Acoustic Wave |
| Keyword(3) | Double-Mode |
| Keyword(4) | Wave-guide |
| Keyword(5) | Observation of SAW |
| 1st Author's Name | Takashi SHIBA |
| 1st Author's Affiliation | Hitachi Media Electronics Co., Ltd.() |
| 2nd Author's Name | Shinichiro OSAWA |
| 2nd Author's Affiliation | Hitachi Media Electronics Co., Ltd. |
| 3rd Author's Name | Junichi HAMASAKI |
| 3rd Author's Affiliation | Hitachi Media Electronics Co., Ltd. |
| 4th Author's Name | Yuji FUJITA |
| 4th Author's Affiliation | Hitachi Media Electronics Co., Ltd. |
| 5th Author's Name | Takao CHIBA |
| 5th Author's Affiliation | Meisei University, Physical Sciences and Engineerin |
| Date | 2004/7/15 |
| Paper # | US2004-24 |
| Volume (vol) | vol.104 |
| Number (no) | 213 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |