Patent ID: 6518853
Filing Date: 2003-02-11
Classification: H01P

Abstract:
An apparatus for interfacing a first waveguide to a second waveguide, where the first waveguide has a smaller diameter than the second waveguide, to eliminate reflections caused as a propagating wave transitions between said first and second waveguides, the apparatus comprising:a first bore adapted to be mated to said first waveguide, said first bore having a first diameter approximately equal to said first waveguide; a second bore formed concentrically with said first bore and in communication with said first bore, said second bore having a second diameter larger than said diameter of said first bore; a first, generally circular conductor disposed within one of said first and second bores adjacent a first point of transition between said first and second bores; a third bore formed concentrically with said second bore and in communication with said second bore, said third bore having a third diameter approximately equal to said second waveguide, said third bore further being adapted to be mated to said second waveguide; a second, generally circular conductor disposed within one of said second and third bores adjacent a second point of transition between said second and third bores; and wherein said second bore forms a quarter wave step transition and said first and second generally circular conductors serve to at least substantially eliminate a reactive component that would otherwise be introduced by said quarter wave step transition.