Patent ID: 6977561
Filing Date: 2005-12-20
Classification: H01P

Abstract:
1. An impedance matching feed for matching an impedance for a coaxial transmission line to an impedance for a ridge waveguide, said impedance matching feed comprising: (a) a transformer having a conductor, a dielectric surrounding said conductor and a length, the dielectric of said transformer having a constant outer diameter along the length of said transformer, said transformer being positioned within a ridge of said ridge waveguide, said transformer having one end connected to said coaxial transmission line, wherein the conductor of said transformer is a stepped conductor having a plurality of steps with each of said plurality of steps having a different diameter and each of said plurality of steps having a different length; (b) a probe disposed within an interior of said ridge waveguide, said probe having one end connected to the conductor of said transformer and another end connected to an upper wall of said ridge waveguide; and (c) the conductor of said transformer being shaped to match the impedance for said coaxial transmission line to the impedance of said ridge waveguide at a reference plane at a location where said coaxial transmission line is connected to said ridge waveguide, when the impedance of said coaxial transmission line and the impedance of said ridge waveguide differ from one another.