In this paper a Double Ridged Horn Antenna (DRHA) for 1.8 - 18 GHz frequency band and VSWR 2.5:1 without split of main lobule radiation pattern at high frequencies is designed and evaluated. The results show that the proposed antenna have maximum gain equivalent to commercial DRHA with volume W×L×H of 4.5cm×11cm×8cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , weight of 132g and operating in a bandwidth of 1:10.
