Saw ladder filter with inter-stage matching saw resonator

Details Saw ladder filter with inter-stage matching saw resonator Saw ladder filter with inter-stage matching saw resonator

1998-02-25

1999-10-05

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, H03H 964

Patent

active

059631139

ABSTRACT:
A SAW filter has SAW resonators coupled in a ladder network with at least one .pi.-type section. Besides having a series-arm SAW resonator and two shunt-art SAW resonators, the .pi.-type section has an inter-stage matching SAW resonator coupled in series with the series-arm SAW resonator. The inter-stage matching SAW resonator has an interdigital transducer with an electrode finger pitch substantially equal to the pitch in the series-arm SAW resonator. The inter-stage matching SAW resonator reduces impedance mismatching between the left half and the right half of the .pi.-type section.

REFERENCES:
patent: 5471178 (1995-11-01), Hickernell
patent: 5559481 (1996-09-01), Satoh et al.
patent: 5592135 (1997-01-01), Taguchi et al.
Ikata et al., "Development of Small Antenna Duplexer Using SAW Filters for Handheld Phones", 1993 Ultrasonics Symposium, pp. 111-114.

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