Single mode waveguide saw dispersive filter

Details Single mode waveguide saw dispersive filter Single mode waveguide saw dispersive filter

1987-06-24

1988-04-12

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333154, 333195, 333196, H03H 9145, H03H 942, H03H 964, H03H 944

Patent

active

047377437

ABSTRACT:
A single mode waveguide dispersive surface acoustic wave (SAW) delay line is formed by aligning an elongated input transducer, which has a pattern of interdigital electrode fingers which launches a wideband SAW, with a beam compressor that feeds an input waveguide. The input SAW passes down the waveguide to a 3 dB coupler which extracts one-half of the power of the incoming SAW and feeds it in the direction opposite to the input wave. Both portions of the SAW are passed to dispersive reflective arrays along a folded path. A series of additional couplers and reflective dispersive arrays that form the folded path serve to further delay the SAW until it reaches a beam expander at the output end which feeds the SAW to an output transducer that is constructed in a manner similar or analogous to the input transducer.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3753164 (1973-08-01), DeVries
patent: 3882430 (1975-05-01), Maerfeld
patent: 3883831 (1975-05-01), Williamson et al.
patent: 3975697 (1976-08-01), Paige
patent: 4155056 (1979-05-01), Cross et al.
patent: 4166228 (1979-08-01), Solie
patent: 4477784 (1984-10-01), Maerfeld et al.
patent: 4521751 (1985-06-01), Riha et al.
patent: 4635008 (1987-01-01), Solie

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