Swif with side lobe compensation barrier

Details Swif with side lobe compensation barrier Swif with side lobe compensation barrier

1975-04-03

1977-01-18

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 82, 310 98, 333 72, H03H 926, H03H 930, H03H 932, H01L 4110

Patent

active

040042545

ABSTRACT:
An acoustic surface wave filter comprises a piezoelectric substrate defining a propagating surface upon which a transmitting and receiving transducer pair are formed in offset alignment. An interposed multistrip coupler provides surface wave coupling between the offset transducers. An elongated isolating barrier is interposed between the transducers in an orthogonal relationship with the coupler to prevent surface wave propagation between the transducers along other than the primary axis. In one embodiment, an isolating barrier is composed of an acoustic surface wave dampening material, while in another a barrier of acoustic surface wave reflective material is used.

REFERENCES:
patent: 3548306 (1970-12-01), Whitehouse
patent: 3559115 (1971-01-01), DeVries
patent: 3701147 (1972-10-01), Whitehouse
patent: 3836876 (1974-09-01), Marshall et al.

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