Patent ID: 6724277
Filing Date: 2004-04-20
Classification: H01P

Abstract:
A feed structure, comprising:a plurality of electrical conductors having a common longitudinal axis, a first one of the conductors and a second one of the conductors providing a first coaxial transmission line and the second one of the conductors and a third one of the conductors providing a second coaxial transmission line; a first conductive, planar septum disposed in, and along a diameter of, the first transmission line; a second conductive, planar septum disposed in, and along a diameter of, the second transmission line; wherein the first septum has a rear portion disposed proximate a first feed port; wherein the second septum has a rear portion disposed proximate a second feed port; wherein the first feed port and the rear portion of the first septum are arranged to establish an electric field in the first transmission line between the first conductor and the second conductor with a component substantially perpendicular to the first planar conductive septum; wherein the second feed port and the rear portion of the second septum are arranged to establish an electric field in the second transmission line between the second conductor and the third conductor with a component substantially perpendicular to the second planar conductive septum; wherein a forward portion of the first septum is asymmetrically disposed along said diameter to establish an electric field component along said diameter of the first transmission line, said first septum having a pair of distal ends, a first distance between one of the pair of ends and a proximate portion of the second conductor being different from a second distance between the other one of the pair of ends and a proximate portion of the second conductor; and wherein a forward portion of the second septum is asymmetrically disposed along said diameter to establish an electric field component along said diameter of the second transmission line, said second septum having a pair of distal ends, a third distance between one of the pair of ends of the second septum and a proximate portion of the third conductor being different from a fourth distance between the other one of the pair of ends of the second septum and a proximate portion of the third conductor.