RADIO FREQUENCY ANTENNA FEED STRUCTURES

摘要

A waveguide feed structure having a coaxial transmission line. A conductive, planar septum is disposed in, and along a diameter of, the transmission line . A feed port is electrically coupled to the transmission line. The septum has a rear portion disposed proximate the feed port, such rear portion of the sept um extending between the inner conductor and the outer conductor. The feed port and the rear portion of the septum are arranged to establish an electric fie ld in the transmission line between the inner conductor and the outer conductor with a component substantially TELL mode along a direction perpendicular to the planar septum. A forward portion of the septum is asymmetrically dispose d with respect to said diameter in order to provide a gap between the inner conductor and the outer conductor, such gap establishing an electric field component within the transmission line having a TELL component along said diameter of the transmission line parallel to the plane of the septum.