Design of a W band filter antenna array with low sidelobe level using gap waveguide

Gap waveguide (GW) was investigated to realize low loss millimeter wave (mm-wave) transmission line in recent years. In this paper, groove gap waveguide (GGW) is used to design a W band filter antenna array. A 14 slots antenna array with a center fed structure and a fourth order cavity bandpass filter are designed respectively. Then the method of integration is used in the combining of antenna and filter to eliminate the transition loss between the two parts. Simulation result shows an antenna gain of 18.64dBi and a side lobe level (SLL) of 20.64dB at the center frequency 94.55GHz. Interference signal outside the frequency range 92.8–96.3GHz is compressed efficiently in our design.

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