We present the proof of concept of a compact slot array antenna with properside lobe level in groove gap waveguide (GGW) technology. Four transverseslots are etched at the GGW broad wall along with the nulls of standing TE_(10)wave existing inside the shorted GGW. To decrease the sidelobes and antennasize, corrugations are applied through the wave path inside the GGW. Properuse of corrugations can reduce the wavelength inside the GGW leading toreduction of the distance between adjacent transverse slots, which can help tosuppress the grating lobe problem and consequently enhance the radiationefficiency, which is a challenge in transvers slot array antennas. The designedantenna is optimized to achieve maximum gain, lowest grating lobe level, andreturn loss at 15 GHz using HFSS simulator. The achieved gain is about13 dBi, and the SLL is better than 15 dB. To confirm the simulation results,the designed antenna was fabricated and tested. Both simulation and measurementresults confirm that the grating lobes are well suppressed at the antennaoperating frequency.
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