Small size cross-coupled trisection filter
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United States of America Patent
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Aug 19, 2003
Grant Date -
Aug 22, 2002
app pub date -
Jun 20, 2001
filing date -
Feb 22, 2001
priority date (Note) -
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Abstract
The present invention relates to a three-order filtering structure. Each resonator includes an inductive portion and a capacitive portion. The inductive portion of the second resonator is folded that the inductive portion of the first resonator is coupled to the inductive portion of the third resonator forming a trisection filtering structure. The cross-couple between resonator 1 and 3 adds additional finite transmission zero below the passband.
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