Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1993-11-22
1995-05-23
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333212, 333230, H01P 1208, H01P 706
Patent
active
054185106
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.
REFERENCES:
patent: 2810890 (1957-10-01), Klopfenstein
patent: 3758882 (1973-09-01), Morz
patent: 4513264 (1985-04-01), Dorey et al.
patent: 4721933 (1988-01-01), Schwartz et al.
patent: 4777459 (1988-10-01), Hudspeth
patent: 5012211 (1991-04-01), Young et al.
Denson-Low W. K.
Gudmestad Terje
Ham Seungsook
Hughes Aircraft Company
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