Low loss SAW matched filters with low sidelobe sequences for spread spectrum communications

Takashi Shiba; Akitsuna Yuhara; Minoru Moteki; Yasuhiro Ota; Kouji Oda; Kazuo Tsubouchi

Low loss SAW matched filters with low sidelobe sequences for spread spectrum communications

Takashi Shiba, Akitsuna Yuhara, Minoru Moteki, Yasuhiro Ota, Kouji Oda, Kazuo Tsubouchi

Research output: Contribution to journal › Conference article › peer-review

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

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@article{61bfb2115b51412dbe37598de0e5876a,

title = "Low loss SAW matched filters with low sidelobe sequences for spread spectrum communications",

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.",

author = "Takashi Shiba and Akitsuna Yuhara and Minoru Moteki and Yasuhiro Ota and Kouji Oda and Kazuo Tsubouchi",

year = "1995",

month = dec,

day = "1",

language = "English",

volume = "1",

pages = "107--112",

journal = "Proceedings - IEEE Ultrasonics Symposium",

issn = "1051-0117",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "Proceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2) ; Conference date: 07-11-1995 Through 10-11-1995",

}

TY - JOUR

T1 - Low loss SAW matched filters with low sidelobe sequences for spread spectrum communications

AU - Shiba, Takashi

AU - Yuhara, Akitsuna

AU - Moteki, Minoru

AU - Ota, Yasuhiro

AU - Oda, Kouji

AU - Tsubouchi, Kazuo

PY - 1995/12/1

Y1 - 1995/12/1

N2 - 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.

AB - 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.

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T2 - Proceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2)

Y2 - 7 November 1995 through 10 November 1995

ER -