Constricted split block waveguide low pass filter with printed c

Details Constricted split block waveguide low pass filter with printed c Constricted split block waveguide low pass filter with printed c

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.

REFERENCES:
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
patent: 4157516 (1979-06-01), van de Grijp
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.

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