Surface acoustic wave filter having parallel/serial resonator co

Details Surface acoustic wave filter having parallel/serial resonator co Surface acoustic wave filter having parallel/serial resonator co

1995-01-05

1996-12-31

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313R, H03H 964

Patent

active

055898068

ABSTRACT:
A surface acoustic wave filter having a configuration in which a plurality of series surface acoustic wave resonators and parallel surface acoustic wave resonators are connected is used as a receiving filter included in a receiving circuit of a communication apparatus capable of simultaneously transmitting and receiving signals. When the transmitting frequency is higher than the receiving frequency, one of the parallel surface acoustic wave resonator, connected between the signal line and the ground, is disposed most closely to the input terminal of the filter. When the transmitting frequency is lower than the receiving frequency, one of the series surface acoustic wave resonator, connected in series to the signal line, is disposed most closely to the input terminal of the filter. Accordingly, the singular point of the filter is prevented from coinciding with the transmitting frequency, so that the deterioration of the resonator is prevented.

REFERENCES:
patent: 4166258 (1979-08-01), Tseng
patent: 4580115 (1986-04-01), Sprengel
patent: 4672339 (1987-06-01), Zibis et al.
patent: 4673901 (1987-06-01), Faulkenau et al.
U.S. Ser. No. 08/373,033, filed Jan. 17, 1995.
Search Report for European Appl. 95100185.8, mailed Apr. 4, 1995.
Hiteta et al., "Investigation of New Low-Loss & High-Power . . . , " vol. 40, No. 3, May 1993, IEEE Transactions, pp. 224-231.
Ieki et al., "Saw Resonators Using Epitaxially Grown or Electrodes," Proc. 11th Symp. on Ultrasonic Electronics 30 (1991), Suppl. 30-1, pp. 176-178.

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