Surface acoustic wave filter, and antenna duplexer and...

Details Surface acoustic wave filter, and antenna duplexer and... Surface acoustic wave filter, and antenna duplexer and...

2005-12-13

2005-12-13

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000

Reexamination Certificate

active

06975180

ABSTRACT:
The present invention provides a surface acoustic wave filter and others that reduce ripples in a reception frequency band while ensuring sufficient attenuation in a transmission frequency band. A surface acoustic wave filter includes a surface acoustic wave resonator that allows a reception frequency band to pass while attenuating a transmission frequency band, and a surface acoustic wave filter connected in series with the surface acoustic wave resonator to allow the reception frequency band to pass while attenuating the transmission frequency band. An inductor is connected to one end of the surface acoustic wave resonator, a connection point between the surface acoustic wave filter and the surface acoustic wave resonator, and/or the other end of the surface acoustic wave resonator.

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P. A. Lorenz and D. F. Thompson, “Wide Bandwidth Low Cost Saw Notch Filters”, 1998 IEEE Ultrasonics Symposium, pp. 51-55.

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