Accession Number : AD0774282

Title :   Surface Wave Parametric Processors and Long Delay Lines.

Descriptive Note : Semiannual rept. 1 Apr-30 Sep 73,

Corporate Author : STANFORD UNIV CALIF MICROWAVE LAB

Personal Author(s) : Shaw,H. J.

Report Date : DEC 1973

Pagination or Media Count : 88

Abstract : -BANDWIDTH PRODUCTS EXCEEDING 10,000, USING PASSIVE, UNGUIDED PROPAGATION. The report presents experimental results on a delay line having 1/2 millisecond delay and 5 MHz bandwidth. This is a helical SAW delay line on a Bi12GeO20 wrap-around crystal plate, operating at 50 MHz, which proves that practical two-port delay lines operating in the millisecond range are within the current technology. An analysis has been made of the problem of broadbanding the transducers for long delay lines of this kind, which involve different considerations than for standard short delay lines. A loss balancing criterion is developed, and computer results are presented which show the general design parameters for delay lines having time delays extending to one millisecond together with bandwidth extending to 60 MHz, using graded interdigital transducer arrays. (Modified author abstract)

Descriptors :   *Acoustic delay lines, Broadband, Transducers, Bismuth compounds, Germanium compounds, Oxides, Crosstalk

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE