Circuit board microwave filters

Details Circuit board microwave filters Circuit board microwave filters

2008-03-11

2008-03-11

Dinh, Tuan (Department: 2841)

Wave transmission lines and networks

Resonators

C333S219100, C174S262000, C174S265000

Reexamination Certificate

active

10494471

ABSTRACT:
A microwave filter has resonator comprised of a cylindrical structure having conductive walls filled with a dielectric material where the cylindrical structure is recessed inside a multi-layered substrate. First and second conductive coupling arms are disposed on a top layer of the substrate for coupling signals to the cylindrical structure. The conductive coupling arms are separated by a dielectric layer. The first and second conductive coupling arms extend away from the center of the cylindrical structure to form a microstrip line. The cylindrical structure further comprises a bottom portion having a solid conductive bottom plate perpendicular to the axis of the cylinder and a bottom conductive ground layer separated from the conductive bottom plate by a second dielectric layer.

REFERENCES:
patent: 4463330 (1984-07-01), Yoneyama
patent: 5172084 (1992-12-01), Fiedziuszko et al.
patent: 5705966 (1998-01-01), Carmi
patent: 5736679 (1998-04-01), Kresge et al.
patent: 6609297 (2003-08-01), Hiramatsu et al.
patent: 6930258 (2005-08-01), Kawasaki et al.

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