Waveguide directional filter

Details Waveguide directional filter Waveguide directional filter

2005-07-12

2005-07-12

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S135000, C333S02100R

Reexamination Certificate

active

06917260

ABSTRACT:
A waveguide directional filter for combining multiple high power UHF television broadcasting transmitters on to a common antenna. The directional filter arrangement includes an input waveguide, an output waveguide and an interconnected cascade assembly of two or more cavity resonators. The input and output waveguides are each aperture-coupled to an end cavity resonator of the cascade assembly. The edges of each aperture incorporate inwardly extending curved protrusions of a characteristic shape. Alternatively or additionally, at least one pair of non-adjacent cavity resonators are coupled by at least one additional coupling element incorporating an external transmission line.

REFERENCES:
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patent: 2939093 (1960-05-01), Marie
patent: 2999988 (1961-09-01), Marie
patent: 3845415 (1974-10-01), Ando
patent: 4327330 (1982-04-01), Ranghelli
patent: 4777459 (1998-10-01), Hudspeth
Y. Isota et al, “Broadband Cylindrical-Cavity Directional Filter” Electronics & Communications in Japan, Part 1—Communications, NY, US, vol. 76, No. 6, Jun. 1, 1993, pp. 85-90, XP000425135.
R. C. Johnson and H. Jasik, “Antenna Engineering Handbook” 1984, NY XP002201459, pp. 42-32.

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