Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1986-09-02
1988-01-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333209, 333230, H01P 1208, H01P 706
Patent
active
047219335
ABSTRACT:
A dual mode circular-type waveguide filter (10) has a cylindrical waveguide body (12) separated by septums (16, 18) into a plurality of resonant waveguide cavities (22, 24, 26). Mutually orthogonal electromagnetic fields (37, 81) in adjacent cavities (24, 26) are electromagnetically coupled with each other by an internal coupling element (60) which is mounted on one of the septums (18) and extends into the adjacent cavities. The coupling element comprises an elongate, conductive wire which includes a first portion (62) extending into one of the cavities and forming a magnetic loop, and a second portion (64) extending into the adjacent cavity and forming an electric probe. The coupling element provides an asymmetrical stopband pole (72a) in the frequency response (70) of the filter.
REFERENCES:
patent: 2626990 (1953-01-01), Pierce
patent: 4453146 (1984-06-01), Fiedziuszko
Elliott Joseph
Hendrick Louis
Schwartz Craig
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
Mitchell S. M.
Nussbaum Marvin L.
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