Method and apparatus for reduction of electromagnetic feed...

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

Reexamination Certificate

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C333S193000, C333S185000

Reexamination Certificate

active

06924716

ABSTRACT:
An apparatus for improving the stop band response of a surface acoustic wave device (200) comprising a surface acoustic wave device (200) having internal electromagnetic coupling (106) and external electromagnetic coupling (108) and acoustic coupling (104); and a cancellation network (250, 251) coupled to the surface acoustic wave device to reduce the internal electromagnetic coupling (106) and external electromagnetic feed through (108); wherein the cancellation network (250, 251) reduces the amount of electromagnetic feed through at the output (102) of the surface acoustic wave device (200).

REFERENCES:
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patent: 5162822 (1992-11-01), Wakamori
patent: 5646584 (1997-07-01), Kondratyev et al.
patent: 5933062 (1999-08-01), Kommrusch
patent: 6377137 (2002-04-01), Ruby
patent: 6426683 (2002-07-01), Gu et al.
patent: 2003/0214371 (2003-11-01), Yip
Colin K. Campbell, Ph.D., D.Sc. “Understanding Surface Acoustic Wave (SAW) Devices for Mobile and Wireless Applications and Design Techniques”, Aug. 2003.

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