Miniature dual mode planar filters
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United States of America Patent
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Aug 4, 1992
Grant Date -
N/A
app pub date -
Apr 19, 1991
filing date -
Apr 19, 1991
priority date (Note) -
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Abstract
A dual mode microstrip resonator (1) usable in the design of microwave communication filters. The substantially square resonator (1) provides paths for a pair of orthogonal signals which are coupled together using a perturbation located in at least one corner of the resonator (1). The perturbation can be introduced by notching (3) the resonator (1) or by adding a metallic or dielectric stub (5) to the resonator (1).
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