Surface acoustic wave device having one-port and double mode SAW

Details Surface acoustic wave device having one-port and double mode SAW Surface acoustic wave device having one-port and double mode SAW

1996-07-25

1999-01-26

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313B, H03H 964

Patent

active

058642625

ABSTRACT:
A surface acoustic wave device which not only is low-loss in a pass band and has high attenuation in an attenuation region but also has superior power-resistance and has a large reflection coefficient in a blocking region comprises a first one-port SAW resonator filter connected in parallel with a three-electrode vertically connected double mode SAW resonator filter. The first one-port SAW resonator filter is so constructed that its resonance frequency is outside the pass band of the vertically connected double mode SAW resonator filter on the low-frequency side thereof and a connection point between the double mode SAW resonator filter and the first one-port SAW resonator filter is provided to an input terminal.

REFERENCES:
patent: 4803449 (1989-02-01), Hikita et al.
Mitsutaka Hikita, "Miniature SAW Antenna Duplexer for 800-Mhz Portable Telephone Used in Cellular Radio Systems", IEEE Transactions on Microwave Theory and Techniques, vol. 36, No. 6, Jun. 1988, pp. 1047-1056.

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