Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1982-03-01
1983-09-20
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333151, 333154, H03H 925
Patent
active
044058748
ABSTRACT:
To enable increased power coupling into a SAW device for which voltage breakdown is a limiting factor in determining the maximum power which can be coupled, each transducer of the SAW device is replaced by a plurality of series-connected inter-digital transducers (IDTs). For operation in an Nth harmonic mode, there may be N series-connected IDTs which are offset from one another by 1/N wavelengths of the fundamental frequency for which the individual IDTs are designed; for high frequency SAW devices, this further increases the power which can be coupled into the device. The SAW device is particularly useful in a delay-line oscillator to constitute a microwave source for a local oscillator in a radio repeater.
REFERENCES:
patent: 3582540 (1971-06-01), Adler
patent: 3675054 (1972-07-01), Jones et al.
patent: 4006438 (1977-02-01), Bennett
patent: 4028649 (1977-06-01), Komatsu et al.
patent: 4126800 (1978-11-01), Shiokawa et al.
patent: 4357584 (1982-11-01), Murray et al.
Lakin, K. M., "A new Interdigital Electrode Technology" IEEE Trans. MTT, 22 (Aug. 74), pp. 763-767.
Haley R. John
Miller J. D.
Northern Telecom Limited
Rebsch D. L.
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