Surface acoustic wave devices and systems including such devices

Details Surface acoustic wave devices and systems including such devices Surface acoustic wave devices and systems including such devices

1980-10-15

1982-10-05

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

310313D, 333153, 333194, 333195, H03H 964, H03H 968, H03H 972

Patent

active

043530435

ABSTRACT:
A two track surface acoustic wave device is provided with a phase plate interposed between input and output transducers on one of the two tracks. An electrical coupler is connected across the output transducers to produce a sum signal at at least one of its outputs corresponding to surface waves making a single transit of each track. The coupler combines other signals having a different phase relationship--eg those corresponding to a triple transit of each track to give a null at one of these outputs. The coupler is connected into matched output loads to provide mutual isolation at its inputs. Tracks of different length may be used instead of the phase plate. Instead of electrical coupling, acoustic coupling may be provided between the two tracks to produce a similar result.

REFERENCES:
patent: 3836876 (1974-09-01), Marshall et al.
patent: 4038614 (1977-07-01), Chapman et al.

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