Patent ID: 8497809

Claim:
An apparatus for electrically coupling a ridge waveguide on a first layer of a feed to a ridge waveguide on a second layer of a feed of an antenna, the apparatus comprising: a first ridge waveguide having an input end and an output end, a first cross-section and impedance, and configured to receive a signal from a first direction; a second ridge waveguide having an input end and an output end, a second cross-section and impedance, substantially parallel to the first waveguide and configured to output the signal in a second direction; and a coupling slot located at the output end of the first ridge waveguide and the input end of the second ridge waveguide for propagating the signal from the first ridge waveguide to the second ridge waveguide, wherein a ridge of the first ridge waveguide comprises a step to match the impedance of the second ridge waveguide with the impedance of the first ridge waveguide.