Accession Number : ADD005247

Title :   Tapped Surface Acoustic Wave Delay Line.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Crowley, James D ; Weller, Joseph F ; Giallorenzi, Thomas G

Report Date : 09 May 1978

Pagination or Media Count : 8

Abstract : A tapped surface acoustic wave (SAW) delay line with time-resolved outputs using piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid piezoelectric semiconductor is placed adjacent to a solid piezoelectric substrate. A pulsed rf input signal is applied to interdigital transducers (IDT) on the substrate. The applied signal launches a SAW in the substrate in a direction parallel to the interface between the substrate and the piezoelectric semiconductor solid. Upon reaching the interface, the SAW is piezoelectrically leaky-wave coupled across an air gap to a bulk acoustic wave in the piezoelectric semiconductor. Reflections of the bulk wave occur at both surfaces of the piezoelectric semiconductor, and piezoelectrically couples back across the air gap to excite a SAW on the piezoelectric substrate. The resultant rf output includes the normal delayed SAW pulse and additional delayed and time-resolved pulses. The amplitude of the bulk wave may be increased using bulk wave amplification. (Author)

Descriptors :   *PATENTS, *DELAY LINES, *ACOUSTIC WAVES, *SURFACE WAVES, TIME STUDIES, PIEZOELECTRIC EFFECT, LEAKAGE(ELECTRICAL), COUPLING(INTERACTION), AMPLIFICATION, LOW LOSS, SOLID STATE ELECTRONICS, SEMICONDUCTORS

Subject Categories : Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE