Roy K Rikimaru

44881304, Dec 11, 1984

Feb 24, 1983

6/469498

Frederick A. Young - Huntington Beach CA
Robert J. Ahulii - Hawthorne CA
Roy K. Rikimaru - Los Angeles CA

Hughes Aircraft Company - El Segundo CA

H01P 1205
H01P 1203

333203

The present invention provides an improved microwave integrated circuit filter for electromagnetic waves. The filter includes a waveguide and three, four or more resonators spaced from one another and extending from the waveguide. Means, which may include a conductive ribbon, are provided electromagnetically coupling nonadjacent resonators.

50122118, Apr 30, 1991

Sep 2, 1987

7/092347

Frederick A. Young - Huntington Beach CA
Roy K. Rikimaru - Los Angeles CA

Hughes Aircraft Company - Los Angeles CA

H01P 1208

333212

A microwave filter is composed of a set of circular cylindrical cavities arranged in cascade array and interconnected by irises having cross-slotted apertures for coupling electromagnetic power in two orthogonal TE. sub. 113 modes. An input port is formed in a first of the cavities and an output port is formed in a last of the cavities. Each port is constructed as a transition between a section of rectangular waveguide and a section of circular waveguide, the section of circular waveguide being a portion of the first cavity and the last cavity, respectively, in the input and the output ports. The cross-sectional aspect ratio of the rectangular waveguide is 2:1. The ratio of a diameter of the cavity to length, as measured along a cylindrical axis in each cavity, is 0. 26 thereby to provide for increased bandwidth while minimizing dispersion and transmission loss.