Low loss saw filters with non-sequential coupling and method of operation thereof
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United States of America Patent
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Jul 27, 1999
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app pub date -
Jul 28, 1998
filing date -
Jul 28, 1998
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Expired
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Abstract
A low loss surface acoustic wave (SAW) filter and method of operation thereof uses non-sequential coupling and, more particularly, cross-coupling to achieve good rejection characteristics with low loss. Strips of metallization are used with a circuit formed of a thin film of metallization. The strips are oriented parallel to an edge of each resonator being cross-coupled. In a six resonator filter, the second and fifth resonators are cross-coupled.
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