Surface acoustic wave filter with multiple ground terminals

Details Surface acoustic wave filter with multiple ground terminals Surface acoustic wave filter with multiple ground terminals

1994-11-04

1996-04-09

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313D, H03H 964

Patent

active

055065520

ABSTRACT:
In a surface acoustic wave (SAW) filter, on a 36.degree. Y-cut X-propagation lithium tantalate substrate, series branch SAW resonators, which are connected in series between an input terminal and an output terminal, and parallel branch SAW resonators, which are connected between respective pairs of the series branch resonators by wirings and which are grounded, are provided. Two series branch resonators and one parallel branch resonator are connected in a T shape, so as to form a fundamental unit. In the SAW filter, three fundamental units are serially connected. An interdigital transducer (IDT) included in each resonator is made of a metal film containing aluminum as the main component. The thickness of the metal film is in the range of 8% to 10% of the electrode pitch of the IDT of the parallel branch resonator.

REFERENCES:
patent: 4166258 (1979-08-01), Tseng
patent: 4365219 (1982-12-01), Nathan
patent: 4734664 (1988-03-01), Hikita et al.
patent: 4803449 (1989-02-01), Hikita et al.
Smith et al., IEEE Transaction on Microwave Theory and Techniques, vol. MTT-20, No. 7, Jul. 1972, "Analysis and Design of Dispersui Interdigital Surfact-Wave Transducers".
Search Report for European Appl. 94117426.0, mailed Mar. 9, 1995.
Electronics Letters, 22 Oct. 1992, vol. 28, No. 22, pp. 2059-2054, Hikita et al., "Extended New-Type Saw-Resonalty-Coupled Filters Used in Duplexes for Japanese Cellular Radio".

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