Cylindrical waveguide resonator filter section having increased bandwidth
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United States of America Patent
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May 23, 1995
Grant Date -
N/A
app pub date -
Nov 22, 1993
filing date -
Nov 22, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A high Q microwave filter is disclosed. Coupling bar structures are included in a cylindrical resonator, extending substantially the entire length of the resonator for coupling orthogonal modes. The coupling bars have a lower profile than conventional tuning screws. The symmetry of the filter structure is improved over the prior art coupling devices which relied entirely on tuning screws for coupling E fields of one mode to the other mode. The coupling bar structure has a lower profile penetrating less into the supported E fields while obtaining the desired coupling. Increased bandwidth may be obtained at improved symmetries over the prior art devices. Fine tuning may be provided by inserting tuning screws into the cylindrical cavity. The tuning screws require less penetration as substantially most of the coupling occurs by virtue of the coupling bars.
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