Design of Compact Transverse Slot Array Antenna Using Corrugated H plane Horn

A compact, high gain, series fed transverse slot array antenna is designed on the top plate of a shorted corrugated H-plane horn. Corrugations are used to reduce the wavelength inside the shorted horn in order to suppress the grating lobe problem associated with the transvers slot arrays. By etching eight transverse slots separated by one guided wavelength, the array is formed and a proper broadside radiation is successfully achieved. The proposed structure can also be interpreted as a flat horn with directive radiation which is also more compact compared to the conventional H-plane horns as the guided wavelength inside it is reduced. The antenna is simulated by HFSS simulator and optimized for maximum gain and best matching condition. The simulation results show that the reflection coefficient is less than -10 dB around 15.15 GHz with about 1.3 % fractional bandwidth and the gain and SLL are about 19 dBi and -13 dB, respectively. Also, the cross polar discrimination of the antenna is better than 25 dB in both E- and H-planes. Simulation results were confirmed by comparing them with those obtained by CST software.