Tapped surface acoustic wave delay line

Details Tapped surface acoustic wave delay line Tapped surface acoustic wave delay line

1977-04-19

1978-05-09

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310313, 330 55, 333 70T, H03H 930, H03F 304, H01L 4502, H03F 355

Patent

active

040889696

ABSTRACT:
A tapped surface acoustic wave (SAW) delay line with time-resolved outputs sing 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.

REFERENCES:
patent: 3684970 (1972-08-01), Wang
patent: 3739290 (1973-06-01), Marshall et al.
patent: 3821667 (1974-06-01), Thomann

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