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Wide bandwidth NSPUDT coupled resonator filter design

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2 Author(s)
Thompson, D.F. ; RF Monolithics, Dallas, TX, USA ; Wright, P.V.

The results of a wide bandwidth natural single phase unidirectional transducer (NSPUDT) quartz coupled resonator filter design effort are discussed. The resulting 850-MHz filter yields a symmetric frequency response, a bandwidth in excess of 0.4%, an ultimate rejection in excess of 50 dB and a turnover temperature of 5°C which can be selectively placed between -25°C and 75°C depending on the rotated Y-cut angle of the quartz substrate. The transducers utilize asymmetric crystal orientations to achieve the unidirectionality with a simple single-level uniform two-electrodes-per-wavelength fabrication. Both theoretical model predictions and experimental results, along with a discussion of the effects of package parasitics, and measured turnover temperature data for several rotated Y-cut angles, are presented. Design considerations and several methods for increasing filter performance are discussed

Published in:

Ultrasonics Symposium, 1991. Proceedings., IEEE 1991

Date of Conference:

8-11 Dec 1991