A New Broadband Horn Antenna With Enhanced Gain for 1-18 GHz EMC Applications

Dual ridged waveguide horn antennas (DRGH) are widely used in antennas and EMC testing systems as feeder and standard antennas respectively. However, traditional 1-18 GHz DRGH antennas have beam splitting above 12 GHz. In this paper, not only the waveguide section and the ridge curve are optimized, and the higher order modes is eliminated, but also the ridge width is further optimized to improving the antenna aperture efficiency. The final design of the DRGH antenna size is 242mm $\times$ 136 mm $\times$ 189 mm, the gain is 6.53 dBi at 1 GHz, 14.1 dBi at 9.5 GHz, 16.5 dBi at 18 GHz.