Transducer for surface wave filters with reduced diffraction

Details Transducer for surface wave filters with reduced diffraction Transducer for surface wave filters with reduced diffraction

1976-10-12

1978-04-04

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310313, 333 30R, H03H 904, H03H 926, H03H 932, H01L 4110

Patent

active

040830217

ABSTRACT:
An input transducer for a surface wave filter with a transfer function T(F) the inverse Fourier transform of which is a function I(t) having maxima the amplitude of which vary within wide limits; such an input transducer comprises at least two elemental transducers of which one has a pulse response comprising the high-amplitude maxima of I(t), while the other(s) has/have a pulse response comprising maxima equal to n times the low-amplitude maxima of I(t); the first is fed by the signal to be filtered; the other(s) is/are fed by a signal equal to 1
of the signal to be filtered. Such a transducer arranged at one end of a piezoelectric substrate of which the other end comprises a wide-band output transducer, provides for the construction of high quality filters.

REFERENCES:
patent: 3551837 (1970-12-01), Speiser et al.
patent: 3803395 (1974-04-01), Quate
"Acoustic Surface Wave and Acousto-Optic Devices," (Edited by T. Kallard), Optosonic Press, New York, N.Y., 1971, title page & pp. 81-89.

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