DIELECTRIC ROD FEED FOR REFLECTOR ANTENNAS

摘要

TITLE A DIELECTRIC ROD FEED FOR REFLECTOR ANTENNAS INVENTORS Lotfollah Shafai Apisak Ittipiboon Ernest Bridges The feed which may be designed for operation in a single or dual bandwidth within a broad frequency range extending from a fraction of a GHz to many GHz, up to and including the range of 8 to 13 GHz. The feed includes a circular waveguide wherein one end is fitted with an electrical coupler and the other end acts as the radiator. A cylindrical dielectric rod is located within the radiating end of the waveguide and extends out of the guide to a length L which is less than .lambda.c/2 where .lambda. is the wavelength at the midband of the operating frequency. The diameter D of the dielectric rod may be equal to the inside of the waveguide, and is less than .lambda.o/.epsilon.r , where .lambda.o is the wavelength of the highest operating frequency of the feed and .epsilon.r is the relative dielectric constant of the dielectric rod.