An aperture coupled 5-element microstrip patch array for 35 GHz with ridge gap waveguide feeding

A 5-element microstrip patch array with aperture coupling is presented for 35 GHz applications. To decrease the transmission loss, the feed network is realized by ridge gap waveguide. The excitation of the upper patches comes from the ridge gap waveguide layer through a coupling aperture, which locates in the ground plane of the substrate. A starlike array is designed to take advantage of the spurious radiation from the feed lines while enhance the gain. The simulation results show about 25.7% of reflection coefficient bandwidth (|S
11
|<−10dB) covering 32–41 GHz frequency range. The simulated gain of the array is more than 14 dB in the desired band.