Abstract
A 300 MHz SAW matched filter with reduced mismatch-loss and with a coded transducer by a low autocorrelation sidelobe sequence has been developed for 1 Mbps SS weak radiation-power wireless communication modem. This low autocorrelation sequence of 25 chips was searched out to conform DS spreading DPSK signal. The sequence reduced output signal sidelobe 6 dB lower than 31 chip m-sequence, further obtained higher processing gain than that of Barker sequences. Furthermore, to reduce mismatch-loss in temperature stable SAW matched filters, a localized layered structure has been developed. ZnO is deposited only on the normal transducer on a ST-cut quartz substrate, reducing the mismatch-loss by 9 dB. A SS radio modem unit using this SAW matched filter shows a rather long transmission distance of about 20 m with a low current consumption 210 mA, considering such a high data rate 1 Mbps and the strict power regulation.
| Original language | English |
|---|---|
| Pages (from-to) | 107-112 |
| Number of pages | 6 |
| Journal | Proceedings of the IEEE Ultrasonics Symposium |
| Volume | 1 |
| Publication status | Published - 1995 Dec 1 |
| Externally published | Yes |
| Event | Proceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2) - Seattle, WA, USA Duration: 1995 Nov 7 → 1995 Nov 10 |
ASJC Scopus subject areas
- Acoustics and Ultrasonics