Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1986-09-02
1988-02-16
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333208, 333230, 333248, H01P 1208, H01P 706
Patent
active
047257989
ABSTRACT:
A waveguide filter is provided which comprises a plurality of waveguide resonators arranged in series in the longitudinal direction of the filter with each contacting tightly with adjacent ones, each of the waveguide resonators being composed of a rectangular dielectric having a length and a permittivity complying with the center frequency of a bandpass filter, on the periphery of which a metal film is provided except on the portions of induction windows of its two sides mutually opposed in the longitudinal direction. According to another feature, the metal film of each waveguide resonator is provided while keeping free additionally a no-electrode portion of the bottom side of the reactor, a supporting base on which the waveguide resonators are secured has concave portions formed therein so as to confront the respective no-electrode portions, and adjusting members made of dielectric material are provided slidably and retractably into the respective concave portions so as to vary the respective opening areas of the no-electrode portions.
REFERENCES:
patent: 2432093 (1947-12-01), Fox
patent: 3157847 (1964-11-01), Williams
patent: 3537043 (1970-10-01), Smith
patent: 3577105 (1971-05-01), Jones, Jr.
patent: 4320367 (1982-03-01), Boujet
patent: 4396896 (1983-08-01), Williams
Beardow-"Waveguide Manufacturing Techniques", British Communications and Electronics, Oct. 1958; pp. 772-778.
Alps Electric, Ltd.
Nussbaum Marvin L.
Shoup Guy W.
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