Programmable phase coded surface wave device

Details Programmable phase coded surface wave device Programmable phase coded surface wave device

1975-02-07

1976-06-01

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

179 15E, 310 98, 333 72, 340347AD, H03H 926, H03H 930, H03H 932, H03K 1302

Patent

active

039612902

ABSTRACT:
A surface wave device (SWD) programmable to produce any one of a plurality of phase coded SWD digital delay line configurations from a single transducer pattern characterized by parallel transducer electrode arrays to provide for each of two opposite phase alternatives of acoustic surface waves being propagated. Each transducer comprises pairs of interdigital taps, each tap characterizing a single binary bit. Transducer phase coding is accomplished by severing in selected taps all metalized fingers of like polarity from their common conductor bar. Critical configuration tolerances prohibitive to programmed operations are thus obviated.

REFERENCES:
patent: 3551837 (1970-12-01), Speiser et al.
patent: 3675052 (1972-07-01), Lindsay et al.
patent: 3680007 (1972-07-01), Tseng
patent: 3681579 (1972-08-01), Schweitzer
patent: 3701147 (1972-10-01), Whitehouse
patent: 3736587 (1973-05-01), Bush et al.
patent: 3800248 (1974-03-01), Speiser et al.
patent: 3805195 (1974-04-01), Miller
patent: 3831116 (1974-08-01), Davis, Jr. et al.

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