A Broadband Groove Guide Coupler for Millimeter-Wave Applications

In this paper we describe the theoretical design and performance of a broadband groove guide coupler. In contrast to conventional design techniques one of the grooves impartially filled with a dielectric. Both grooves are coupled via a slot in a thin metallic septum separating the grooves. It will be shown how a flat coupling over a wide frequency range can be obtained by taking advantage of the dispersion of even and odd modes and the frequency dependence of the modes in the individual grooves.