60GHz Slot-Array Antenna Design Based on Gap Waveguide Cavity and Gap Waveguide Feed

Paper in proceeding, 2014

We propose a multilayer layer 32x32 slot array
antenna realized in gap waveguide technology. The antenna has
three metal layers: the first layer is the radiating slots in the
form of 16x16 subarrays of 2x2 slots, the second defining an airfilled
cavity below each subarray, and the third layer forms the
distribution network for the 16x16 subarrays. Both the cavity
layer and distribution network layer have been designed using
gap waveguide technology. Thus the problem of good metal
connection between all these layers is completely avoided. The
proposed antenna is operating over 11% relative bandwidth
covering 58 - 65GHz with -10dB reflection coefficient. The
simulated directivity of the 2×2 slot subarray is 13dbi at the
center of the band. We present also a T-junction 3-dB power
divider for the distribution network designed in groove gap
waveguide technology. The reflection coefficient for the designed
T-junction is well below -15dB over the band of interest.