Fast Analysis and Bandwidth Enhancement of the Radiating Subarray by Method of Moments for a Parallel-Plate Slot Array Antenna With Perpendicular-Corporate Feed

Fast analysis and wideband design using method of moments (MoM) are proposed for a radiating subarray in a parallel-plate slot array antenna with perpendicular-corporate feed in this article. Applying the MoM and a genetic algorithm (GA) to the subarray design enables fast electromagnetic analysis and easy optimization for wideband performance. A comparison with the HFSS simulation proves the superior efficiency of designing by the proposed approach. The simulated bandwidth (BW) of reflection below −14 dB for the subarray gets up to 13.1% by a two-layer geometry in this article, much improved from the 7.7% by a three-layer structure or the 11.4% by a four-layer structure using the conventional design method based on the HFSS simulation. The fabricated 16
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16-slot array shows a measured BW of 13.2% (58.7–67.0 GHz) with a reflection below −10 dB and a high antenna efficiency greater than 70% over a BW of 11.2% (59.7–66.8 GHz). At the design frequency of 61.5 GHz, a high measured gain of 32.9 dBi with antenna efficiency of 81.8% is demonstrated.