Microstrip filter with reduced ground plane

Details Microstrip filter with reduced ground plane Microstrip filter with reduced ground plane

1993-02-19

1994-05-31

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333204, 333205, H01P 1203, H01P 1205

Patent

active

053172914

ABSTRACT:
This microstrip comb line filter includes a planar dielectric substrate, and a planar ground member positioned on one side of the dielectric substrate and extending along a first portion of the substrate. There is a second portion of the substrate along which the ground member does not extend, thereby forming a cavity filled with air. A plurality of generally parallel, electromagnetically coupled and spaced-apart, elongate microstrip conductors are positioned on the other side of the dielectric substrate. One end of each of the conductors is positioned adjacent to the first portion of the substrate and connected to the ground member. The other end of each of the conductors is electrically spaced from the ground member and positioned adjacent to the second portion of the substrate. The air cavity extends along at least half the length of the conductors.

REFERENCES:
patent: 2915716 (1959-12-01), Hattersley
patent: 3213382 (1963-09-01), Hensel
patent: 3525954 (1970-08-01), Rhodes
patent: 3562677 (1971-02-01), Gunderson
patent: 3566315 (1971-02-01), Vinding
patent: 3582841 (1971-06-01), Rhodes
patent: 3617954 (1971-11-01), Levy et al.
patent: 4224587 (1980-09-01), Makimoto et al.
patent: 4467296 (1984-08-01), Cohen et al.
patent: 4488130 (1984-12-01), Young et al.
patent: 4721931 (1988-01-01), Nishikawa et al.

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