Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-08-24
1989-01-31
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333154, H01L 4108
Patent
active
048018368
ABSTRACT:
A SAW dispersive delay device comprises a high-coupling piezoelectric substrate such as lithium niobate, an input and an output metallic transducer deposited on the piezoelectric substrate, and a pair of coextensive metallic reflective arrays deposited on the same substrate and respectively aligned with the transducers. The arrays comprise a number of "shorted" and "open" reflectors which are alternately interleaved. The reflectors are inclined substantially 45.degree. with respect to the aligned tranducer propagation direction. The periodicity of the reflectors varies along the length of each reflective array so that different frequencies are reflected at different locations along each array to thereby provide a different delay path. The periodicity variation is the same in the two arrays. The periodicity of these reflectors varys in a manner consistent with a prescribed dispersion characteristic.
REFERENCES:
patent: 3883831 (1975-05-01), Williamson et al.
patent: 4155057 (1979-05-01), Sandy et al.
patent: 4166228 (1979-08-01), Solie
patent: 4403165 (1983-09-01), Ballato et al.
patent: 4551695 (1985-11-01), Tanji et al.
New Types of SAW Reflectors and Resonators Consisting of Reflecting Eleme with Positive and Negative Reflection Coefficients by Masao Takeuchi et al., IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. UFFC-33, No. 4, Jul. 1986, pp. 396-374.
"L-Band Reflective-Array Compressor with a Compression Ratio of 5120" by Williamson et al., MIT London Laboratory, pp. 490-493.
Budd Mark O.
Kanars Sheldon
Mullarney John K.
The United States of America as represented by the Secretary of
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