Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1983-04-15

1984-12-04

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333154, 333195, 333196, H03H 9145, H03H 964

Patent

active

044867247

ABSTRACT:
An acoustic surface wave device using apodized interdigital transducers 32, 33, of the kind disclosed in DE 28 54 072 in which the ungrounded bus-bar 44 is inclined towards the transducer axis and a velocity compensation section 36 is provided formed by grounded dummy electrodes 37 arranged parallel to the array electrodes.
The improvement comprises locating a grounded bus-bar portion 38 adjacent the inwardly inclined bus-bar portion 44' so that the facing boundary edges are uniformly spaced in the axial direction, the inclination being such that either a minimum or a side-lobe of substantially reduced magnitude of the sin x/x response is directed axially.

REFERENCES:
patent: 4205285 (1980-05-01), Dempsey et al.
patent: 4333065 (1982-06-01), De Vries
patent: 4420728 (1983-12-01), Bower

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