Surface-acoustic-wave filters with poles of attenuation created

Details Surface-acoustic-wave filters with poles of attenuation created Surface-acoustic-wave filters with poles of attenuation created

1997-12-18

1999-05-18

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333133, 333195, H03H9/64

Patent

active

059054182

ABSTRACT:
A surface-acoustic-wave filter couples a two-port surface-acoustic-wave resonator filter circuit coupled in parallel or in series with a two-port impedance circuit. The two-port impedance circuit has an impedance that creates a pole of attenuation, by making the open-circuit impedance of the surface-acoustic-wave filter equal to the short-circuit impedance. High attenuation over a wide range of stopband frequencies is obtained in this way, combined with steep roll-off between the passband and stopband.

REFERENCES:
patent: 5506552 (1996-04-01), Seki et al.
patent: 5559481 (1996-09-01), Satoh
patent: 5592135 (1997-01-01), Taguchi et al.
patent: 5610566 (1997-03-01), Chen et al.
Fink et al., "Electronics Engineers' Handbook" McGraw Hill, 1989, pp. 3-27 to 3-29.

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