Research on Gap Waveguide Millimeter Wave Array Antennas

A single-layer, wideband, low-loss feed network for slot antenna arrays is described. The antenna is fabricated using ridged waveguide technology and is formed between two parallel metal plates, eliminating the need for electrical contact between these plates. The feed network is implemented by means of a pin texture and guide ridge on the base plate, with radiating slots placed on a smooth top plate. This article innovatively proposes a ridge slot waveguide antenna array installed on a cylindrical ground plane, which is fed by a quarter power splitter to 40 time slots out of 4 branches. The full wave simulation of the antenna structure was conducted using CST microwave studio, and the characteristics of the ridge gap waveguide antenna array were studied through simulation. The impedance bandwidth of the array was 5GHz, and the gain of the linear array was 11.2 dBi.