Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1989-09-19
1991-04-02
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333 21R, 333248, H01P 1207
Patent
active
050049933
ABSTRACT:
A waveguide low pass filter is composed of an assembly of an outer waveguide, an inner waveguide shorter in length than the outer waveguide, and a printed circuit filter substrate. The outer and inner waveguides have split block constructions. The inner waveguide is mounted within the outer waveguide so as to form a constriction within the outer waveguide limiting propagation of energy within the outer waveguide to the fundamental TE.sub.10 waveguide mode. The printed circuit filter substrate is mounted to extend longitudinally between the assembled split halves of the respective outer and inner waveguides, and is constructed of a substantially planar dielectric substrate element and upper and lower conductive plate elements on the substrate and lying in the plane thereof. The conductive plate elements define a tapered dual ridge transformer section. The lower plate element has longitudinally spaced vertical slots formed therein defining an open stub slotted filter array.
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patent: 3916352 (1975-10-01), Powell
patent: 3949327 (1976-04-01), Chapell
patent: 3952270 (1976-04-01), Louvel
patent: 4028650 (1977-06-01), Konishi et al.
patent: 4052683 (1977-10-01), van Heuven et al.
patent: 4096457 (1978-06-01), Snyder
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patent: 4673903 (1987-06-01), Saad
patent: 4897623 (1990-01-01), Reindel
Matthaei et al., "Microwave Filters, Impedance-Matching Networks, and Coung Structures", 1964, pp. 390-399, McG-H.
Levy, "Tapered Corrugated Waveguide Low-Pass Filters", Aug., 1973, pp. 526-532, IEEE Transactions on Microwave Theory & Techniques, vol. MTT-21, No. 8.
Fendelman Harvey
Ham Seung
Keough Thomas Glenn
LaRoche Eugene R.
The United States of America as represented by the Secretary of
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