A Novel Wideband Microstrip Line to Ridge Gap Waveguide Transition Using Defected Ground Slot


In this letter design of a unique, wideband and low loss microstrip line transition to ridge gap waveguide is described. The transition is made from two sections. The first section could be a microstrip line that feeds a slot on the bottom plane. The microstrip line is placed within a metal box. The second part is that the slot to ridge gap waveguide matching section. The proposed design contains a broadband coupling to ridge gap waveguide and covers the entire stop-band of the periodic gap structure. The design optimization is performed for the microstrip line, slot size and ridge gap waveguide matching ridges. A prototype in Ku-band is manufactured and measured that shows a come loss less than fourteen dB and a back-to-back insertion loss smaller than zero.five dB for the given bandwidth. The microstrip transition permits integration of monolithic microwave integrated circuits (MMICs) in ridge gap waveguide technology.

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