Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1988-08-18
1990-09-04
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333196, 310313R, 310313B, H03H 964
Patent
active
049547950
ABSTRACT:
A filter for suppressing surface to surface interference for a satellite communication receiver which utilizes a surface acoustic wave (SAW) element. The SAW filter comprises two inter-digital transducers for input and one inter-digital transducer for output, all three transducers are constructed and arranged on a piezoelectric substrate. The widths of the adjacent portions of electrodes and the spaces between the electrodes of the input inter-digital transducers are adjusted based upon the principle of a transversal filter so that the frequency responses of the input interdigital transducers have a predetermined band width and a reduced gain of a frequency range where an interference signal exists respectively.
REFERENCES:
patent: 3777274 (1973-12-01), Abraham
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3889065 (1975-06-01), Alsup
patent: 4013834 (1977-03-01), Kino et al.
patent: 4625207 (1986-11-01), Skeie
Lewis, M. F., "Surface--Acoustic Wave Filters Employing Symmetric Phase Weighted Transducers"; Electronic Letters; vol. 9, No. 6; 22 Mar. 1973; pp. 138-140.
LaRoche Eugene R.
Lee Benny
Samsung Electronics Co,. Ltd.
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