Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1985-05-24

1987-05-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333153, 333195, H01L 4108

Patent

active

046635548

ABSTRACT:
In a surface acoustic wave device including launching and receiving transducers (2, 3) and a reflective multistrip coupler (4), the inner boundaries of the input and output electrode arrays (5, 6) of the reflective coupler (4) are defined both electrically and acoustically by an electrically discontinuous strip (23) formed for example by isolated islands of metalization (24) in conjunction with corresponding adjacent portions of interconnecting conductors (16). This enables the effective apertures of the input and output arrays (5, 6) to be better matched to the transducers (2, 3). The arrangement can reduce the insertion loss in low-loss SAW devices (i.e. in which both ends of the transducers (2, 3) are coupled via corresponding reflective couplers (4)) and also in single symmetrical guided mode SAW devices in which the strip 23 can provide an effective inner guiding bus bar whose surface mass loading corresponds to that of the outer bus bars (9, 10).

REFERENCES:
patent: 4365220 (1982-12-01), Hikita
patent: 4510471 (1985-04-01), Flinn et al.
patent: 4511867 (1985-04-01), Schofield

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