Small and Low-Loss Intermediate Frequency Surface Acoustic Wave Filters Using Zinc Oxide Film on Quartz Substrate

Autor:	Michio Kadota, Hajime Kando
Rok vydání:	2003
Předmět:	Materials science Physics and Astronomy (miscellaneous) business.industry Surface acoustic wave General Engineering General Physics and Astronomy Love wave Transducer Intermediate frequency Insertion loss Optoelectronics business Temperature coefficient Quartz Electronic filter
Zdroj:	Japanese Journal of Applied Physics. 42:3139-3142
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.42.3139
Popis:	A ZnO/quartz substrate is expected to be applied to a intermediate frequency (IF) surface acoustic wave (SAW) filter for which a small size, a low insertion loss, and a good temperature coefficient of frequency (TCF) are necessary because it has a large ks and an excellent TCF. However it was clarified that the SAW filter consisting of a single solid electrode or single-phase unidirectional transducer (SPUDT) on ZnO/quartz substrate often has a large spurious response due to the Love wave. The new cutting angle and the propagating direction (26–27°Y-X) for quartz were developed in order to suppress the spurious response. The developed W-CDMA IF 380 MHz filter was mounted on a small package of 3.2×5.0 mm2. It had a low loss of 5.8 dB, and high adjacent channel selectivity (ACS) of 36.1 dB/35.0 dB. Then, the developed N-CDMA IF 183 MHz filter was mounted on a small package of 5×7 mm2. It had a low loss of 4.3 dB. In both cases, the frequency shift per 1°C was less than 0.37 ppm/°C.
Databáze:	OpenAIRE
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