Saw ladder filter with split resonators and method of providing

Details Saw ladder filter with split resonators and method of providing Saw ladder filter with split resonators and method of providing

1997-12-02

1999-09-07

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333193, H03H 964

Patent

active

059493062

ABSTRACT:
An acoustic wave ladder filter (55) incorporating split resonators (50) in place of single, small static capacitance resonators in legs of the ladder filter (55). The split resonators (50) have approximately the same frequency but less than twice the static capacitance as the single resonator they replace. The decrease in static capacitance results in a lower capacitance ratio, r. In addition, the Q of the split resonators is higher than the single resonator they replace. Therefore, the average Q/r ratio for the filter (55) increases providing higher performance in terms of insertion loss and ultimate rejection. The basic filter configuration remains relatively unchanged and thus matched to the proper impedances.

REFERENCES:
patent: 5471178 (1995-11-01), Hickernell
patent: 5543757 (1996-08-01), Kobayashi et al.
patent: 5559481 (1996-09-01), Satoh et al.
patent: 5844453 (1998-12-01), Matsui et al.
"Low Loss Ladder Type SAW Filter In The Range of 300 to 400 MHz", Ueda et al., Published: 1994 IEEE Ultrasonics Symposium Proceedings, pp. 143-146.
"Development of Low-Loss Bandpass Filters Using SAW Resonators For Portable Telephones", Ikata et al., Published: 1992 IEEE Ultrasonics Symposium Proceedings, pp. 111-115.
"L and S Band Low-Loss Filters Using SAW Resonators", Matsuda et al., Published: 1994 IEEE Ultrasonics Symposium Proceedings, pp. 163-167.

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