A New Monolithic Crystal Filter Using Piezo-electric Coupling between Anisotropic Laminae,
ARMY ELECTRONICS TECHNOLOGY AND DEVICES LAB FORT MONMOUTH N J
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The paper presents a systematic and comprehensive analytical treatment of thickness-mode plate vibrations in stacked piezoelectric crystals that is at once rigorous and practical. The results are cast in terms of distributed electrical networks that reduce arduous mathematical procedures to standard circuit theory ant network manipulations. These are then applied to analyze a novel type of frequency-sensitive device - - the stacked-crystal filter. Experimental realizations of this device prove what is predicted on the basis of computer simulations applied to the networks that this family of devices, and, by extension, other classes of devices based upon the stacking principle applied to piezoelectric crystal laminae, possess a striking potential for satisfying current and future frequency- and time-control requirements of Army secure communications. In particular, highly temperature-stable stacked-crystal bandpass filters are inherently capable of wideband operation with low insertion loss and extraordinary mode special purity.
- Electrical and Electronic Equipment