| Autor: |
Satoshi Ichikawa, Masayoshi Koshino, O. Furukawa, Yasuo Ebata |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121). |
| Popis: |
A SAW antenna duplexer (DPX) consists of a TX-filter, a RX-filter and a phase-shifter. They are demanded to be durable against 1.2 W of excitation power for several ten thousands hours. The filters, consisting of several parallel and series connected one-port resonators, contain high density SAW power and tend to deteriorate by the stress-migration of the aluminum electrodes. We analyzed the absolute values of each resonator-surface strain induced by resonant SAW energy using the numerical analysis method. Several facts are found that strains of aluminum film electrodes vary 2-3 times with driving frequency and that the connected condition of TX and RX filters through phase-shifter reduces resonators surface strains in RX filter for TX frequency band. Experimental life tests are also carried out. As a result, high textured Cu-doped aluminum on Ti film of SH-mode resonators on 36 Y-cut LiTaO3 proves to withstand for the 1.2 W driving power. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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