Analysis and simulation of a modified broadband 1–18 GHz double ridged guide horn

In this paper a modified broadband 1–18 GHz double ridged guide horn antenna (DRGH) with a feeding section including coaxial input and a back shorting plate is introduced. The major differences with the conventional version are in shape of H-plane flares, removal of E-plane flares, shape of ridges and sizes of various parts. Since there is no explanation for the effects of most of the antenna parameters on its EM characteristics in open literature, it was worth to investigate them more rigorously. Among different parameters, three most important ones are presented. The results from time domain simulations show that the parameters such as: the profile of the ridges, the initial distance between ridges and the outer shape of the H-plane flares can affect VSWR, gain and radiation pattern especially for high frequencies.