Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1987-02-25
1988-01-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333202, 333223, 333263, H01P 1205, H01P 704
Patent
active
047219327
ABSTRACT:
A ceramic TEM resonator bandpass filter with varactor tuning is disclosed. The varactor is located within the resonator holes of a ceramic TEM resonator filter, and is positioned within said holes immediately above the upper extent of the metal plating forming the resonator in said resonator holes. The placement of the varactor in such a manner reduces the interference caused by the varactor in the interresonator coupling. A new apparatus for positioning the varactor within the resonator hole is disclosed and basically includes a conductive rod which at its top end receives the varactor.
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Schaffner-"Design Tips for Coaxial-Cavity Varactor Multipliers"(An 159), Application Note, Motorola Inc. (Reprinted from Electronics, Printed Nov. 1965; pp. 3-10, Front Cover Page and Rear Cover Page.
"Comb-Line Bandpass Filters of Narrow or Moderate Bandwidth" by George L. Matthaei, Aug. 1963, Microwave Journal, pp. 82-91.
"Analysis and Composition of a New Microwave Filter Configuration with Inhomogeneous Dielectric Medium" by A. Fukasawa, IEEE Trans. on Microwave Theory and Techniques, vol. MTT-30, No. 9, Sep. 1982, pp. 1367-1375.
"Ceramic-Filled Resonator Cuts Costs of Radio-Telephone Filters" by T. Uwano, Jul. 14, 1983, Electronics, vol. 56:129-131.
Microwave Filters Impedance Matching Networks and Coupling Structures by G. L. Matthaei et al, McGraw Hill Book Co., NY, NY, 1964, Sections 8.13, and 8.14, and 12.01-12.07.
Hamann H. Fredrick
Murrah M. Lee
Nussbaum Marvin L.
Rockwell International Corporation
Williams Gregory G.
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