Abstract
In this paper, preliminary results of an array of resonant cavity antennas (RCAs) to operate at 60 GHz are presented. Each RCA in the array has a two-layers all-dielectric superstructure with permittivity variation in axial direction. The single RCA element exhibits a peak directivity of 16.6 dBi and its 3dB directivity bandwidth covers the entire unlicensed 60 GHz band from 59 GHz to 67 GHz. The RCA array has a peak directivity of 22.8 dBi with a 3dB directivity bandwidth of 33%. The inter-element spacing between the array elements is optimized to achieve the best performance in terms of peak directivity and radiation bandwidth. The total area of the RCA array is 3.8λ 0 × 3.8λ 0 .
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