Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1988-07-15

1990-07-03

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 31031313, H03H 925

Patent

active

049394878

ABSTRACT:
When SAW filter is used as a receiving filter of an antenna duplexer filter in a cellular radio equipment, since a transmitting signal of an out-band frequency has a large power for the SAW filter, the large power can leak into the SAW filter to generate inter-modulation disturbances in the SAW filter. Since the inter-modulation disturbances are generated when the transmission power density of the surface acoustic wave is made too large, input converters are divided, and the divided converters are disposed in the direction perpendicular to the propagation direction of the surface acoustic wave to lower the transmission power density. Since the divided converters are connected in series, reduction in the impedence together with increase of the aperture length can be compensated.

REFERENCES:
patent: 3582840 (1971-06-01), De Vries
patent: 4114116 (1978-09-01), Reeder
patent: 4321567 (1982-03-01), Sandy
patent: 4353043 (1982-10-01), Gunton
patent: 4405874 (1983-09-01), Suthers
patent: 4494031 (1985-01-01), Barnes et al.
patent: 4604595 (1986-08-01), Kadota
Lewis-"Triple Transit Suppression in Surface-Acoustic-Wave Devices", Electonics Letters, Nov. 16, 1972, vol. 8, No. 23; pp. 553-554.
Slobodnik, Jr.-"Nonlinear Effects in Microwave Acoustic LiNbO.sub.3 Surface Wave Delay Lines", The Journal of the Acoustical Society of America, vol. 48, No. 1, (part 2) 1970; pp. 204-209.
Lewis-"Surface-Acoustic-Wave Filters Employing Symmetric Phase-Weighted Transducers", Electronic Letters, Mar. 22, 1973, vol. 9, No. 6; pp. 138-140 .

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