Development and Experimental Characterization of Aluminum-based DRHA with Quadratic Ridge Profile

In this paper, the development and experimental characterization of an aluminum-based Double-Ridged Horn Antenna (DRHA) are presented. These aim to prove the effect of adding quadratic ridge profiles in lowering the cut-off frequency of a conventional horn antenna. Two horn antennas, namely a conventional horn antenna and a DRHA, were utilized for the development and characterization. Both antennas are fabricated using a Computer Numerical Control (CNC) milling machine with a metal aluminum as row material. The reflection coefficients were experimentally measured to observe the cut-off frequency of fabricated antennas. The radiation patterns were performed in both elevation and azimuth angles. The results of experimental characterization show that the insertion of quadratic ridge profiles into the conventional horn antenna was successfully decreased the cut-off frequency.