Accession Number : AD0837936

Title :   A MICROWAVE SOURCE USING ULTRASONIC AMPLIFICATION IN PIEZOELECTRIC SEMICONDUCTORS.

Descriptive Note : Physical sciences research papers no. 356,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA

Personal Author(s) : Slobodnik, Andrew J., Jr

Report Date : APR 1968

Pagination or Media Count : 45

Abstract : The possibility of a microwave generator utilizing acoustic amplification in a piezoelectric semiconductor is considered. Spontaneous oscillation resulting from a negative attenuation coefficient in a high overtone acoustic resonator is coupled to a load by placing the resonator in the gap of a microwave reentrant cavity. An equivalent circuit is derived for this device. Transducers are not required and a well-defined output frequency can be produced. Design procedures are given and are illustrated by the numerical design of a 3-GHz ZnO source, a 1-GHz ZnO source, and a 1-GHz CdS source. Dc power dissipation will probably limit usefulness to pulsed operation. White's theory of ultrasonic amplification in piezoelectric semiconductors is reviewed. A linear, small-signal theory is used throughout. (Author)

Descriptors :   (*MICROWAVE OSCILLATORS, PIEZOELECTRIC CRYSTALS), (*SEMICONDUCTOR DEVICES, ULTRASONIC RADIATION), CADMIUM SULFIDES, ZINC COMPOUNDS, OXIDES, ULTRAHIGH FREQUENCY, PIEZOELECTRIC EFFECT, PROPAGATION, RESONANT FREQUENCY, PERFORMANCE(ENGINEERING), ATTENUATION.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE