Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-03-16
1985-01-15
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, 333141, 333154, 333193, H03H 925, H01L 4108
Patent
active
044940319
ABSTRACT:
N.sup.2 acoustic wave devices (A,B,S,T; where N is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency are electrically connected in a parallel-series arrangement which has substantially the same electrical impedance and transfer characteristics as any one of the individual N.sup.2 devices, but an increased active device area. The increased active area reduces stress and alleviates acoustically-induced migration in the metal of, for example, transducer electrode fingers (6,7) of resonators at high power levels. The parallel-series arrangement consists of N groups, each of which comprises N devices (A,B or S,T), the corresponding pairs of terminals (4,54 and 54,55) of which are connected in series. Some terminals (54 or 55) may be common to two or more devices and some devices may have merged transducers in which the electrode fingers (6 or 7) of one transducer are a longitudinal extension of the fingers of a parallel transducer. In the case of multi-port devices the input and output terminal pairs may be differently grouped as regards the individual devices to which they belong.
REFERENCES:
patent: 3942140 (1976-03-01), Laker et al.
patent: 3987367 (1976-10-01), Hartemann
Barnes Christopher S.
Moore Paul A.
White Philip D.
Franzblau Bernard
Mayer Robert T.
Miller J. D.
Rebsch D. L.
U.S. Philips Corporation
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