Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
1988-10-27
1991-02-19
Lee, Benny
Wave transmission lines and networks
Coupling networks
Delay lines including elastic surface wave propagation means
333165, 357 24, 310313R, H03H 944, H01L 29816, H01L 4100
Patent
active
049947729
ABSTRACT:
An acoustic charge transport (ACT) device is easily constructed to provide for variable carrier frequency operation or, alternatively, for variable time delays. Variable carrier frequency operation in an ACT device is achieved by incorporating a two dimensional dispersive transducer array which has an interdigitated finger arrangement. This array has a graded periodicity or finger spacing that varies along the length of the array and also has the fingers placed at a 45 degree angle with respect to the length of the array. Because of the varying spacing of the electrode fingers, different spatial regions in the piezoelectric substrate are preferentially excited reflecting the presence of specific frequency components in an applied input signal. A variable time delay is similarly achieved in an ACT device by incorporating a two dimensional interdigital transducer array having fingers with a graded periodicity. The finger spacings in this transducer array are placed at a 90 degree angle with respect to the length of the array. By simply changing the frequency of the input signal in the selected ACT device, variable carrier frequency operation and variable time delays are provided.
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Paper entitled "Monolithic GaAs Acoustic Charge Transport Devices", presed at the 1982 Ultrasonics Symposium Proceedings by Michael J. Hoskins and Bill J. Hunsinger, pp. 456-460.
Book on "Surface-Wave Devices for Signal Processing" by David P. Morgan, 1985, pp. 256-267.
Lee Benny
Maikis Robert A.
The United States of America as represented by the Secretary of
Zelenka Michael
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