The comparison of two structures of wide band horn antenna

Abstract

ABSTRACTThis study reports the two different wide band horn antennas which operate in 6.5–20.5 GHz range. The first antenna is a simple double ridged horn (one-step flare) and the second antenna is a novel dual section flare horn (two-step flare). Flare of the second antenna comprises of two sections, ridged flare and radiating flare. This two-step antenna is designed to have 10 dB similar beamwidth for the two main polarisations at the rotation state of 45°. For better comparison in the design of antennas, similarity of the gain is considered. The dimensions of these two antennas are approximately the same. The performances of two designs are investigated in terms of VSWR and location of the phase centre. Moreover, similarities of the patterns for both vertical and horizontal polarisations over 10 dB beam width (at 45° slant rotation) for the two designs are compared. The results show that the patterns of one-step flare antenna for the two main polarisations over the 10 dB beamwidth are not the same. Simulations of these antennas are done by HFSS Ansoft designer software and Microwave studio CST software. One prototype of each antenna is fabricated and tested with exceptional comparison between measured and simulated results.