Multiple-stage ladder type SAW filter having series resonators w

Details Multiple-stage ladder type SAW filter having series resonators w Multiple-stage ladder type SAW filter having series resonators w

1999-01-29

2000-02-29

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 333195, 310313B, H03H 964

Patent

active

060314354

ABSTRACT:
In a multiple stage ladder type SAW filter constructed by cascade-connecting several SAW resonators in the form of a multiple-stage ladder, the electrode pitches of the first stage series-arm SAW resonator through the last stage series-arm SAW resonator, respectively, are gradually decreased. In this case, each stage has a series-arm SAW resonator and a shunt-arm SAW resonator. As a result, the resonance frequencies of the first stage series-arm SAW resonator through the last stage series-arm SAW resonator are increased monotonically from the first stage to the last stage. As a consequence, the frequencies of the upper poles of attenuation generated by the series-arm SAW resonators differ from each other. Therefore, a desired amount of attenuation can be obtained over a wide band.

REFERENCES:
patent: 5471178 (1995-11-01), Hickernell
patent: 5638036 (1997-06-01), Penunuri et al.
patent: 5726610 (1998-03-01), Allen et al.
patent: 5831493 (1998-11-01), Ushiroku
M. Hikita et al., "Experiments of High-Performance SAW Filters for Mobile Radio Transceivers", Transaction of the Institution of Electronics, Information and Communication Engineers, vol. J76-A, No. 2, Feb. 1993, pp. 236-244.
Y. Satoh et al. , "A Low-Loss Band-Pass Filter Using SAW Resonators", Transaction of the Institution of Electronics, Information and Communication Engineers, vol. J76-A, No. 2, Feb. 1993, pp. 245-252.

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