Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1973-12-26
1976-05-25
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
29 2535, 310 98, H03H 926, H03H 930, H03H 932, H01L 4122
Patent
active
039597482
ABSTRACT:
A method of manufacturing an acoustic surface wave filter includes forming a first and second pair of transducers and a multistrip coupler upon the surface of a piezoelectric medium in a rectangular configuration with the transducers occupying its corners. Each transmitting transducer is diagonally oriented with its respective receiving transducer and the multistrip coupler is interposed between the transmitting and receiving transducers substantially orthogonal to the direction of surface wave propagation. Test signals are applied to each transducer pair to select the most favorable for use. The other pair is disabled. A SWIF manufactured in accordance with the method is disclosed having one pair of transducers disabled.
REFERENCES:
patent: 3559115 (1971-01-01), DeVries
patent: 3621482 (1971-11-01), Adler
patent: 3675163 (1972-07-01), Hartmann et al.
patent: 3766496 (1973-10-01), Whitehouse
patent: 3836876 (1974-09-01), Marshall et al.
Marshall et al., Theory and Design of the Surface Acoustic Wave Multistrip Coupler", in IEEE Trans. on Sonics and Ultrasonics, vol. SU-20, No. 2, Apr. 1973, pp. 124-133.
Smith et al., "Analysis of Interdigital Surface Wave Transducers by the Use of an Equivalent Circuit Model", in IEEE Trans. on Microwave Theory and Techniques, vol. MTT-17, No. 11, Nov. 1969, pp. 856-861.
Camasto Nicholas A.
Ekstrand Roy A.
Nussbaum Marvin
Smith Alfred E.
Zenith Radio Corporation
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