Theoretical analysis of short backfire antenna by using Moment of method

The short backfire antenna is one of the important types antennas due to its high directional and other characteristics. Therefore, this research deals with, a theoretical study calculate radiative structures as an axially symmetric body using moment method. main goal theoretically radiation fields compare them with previous practical researches. Where mathematical analysis used software was verified by comparing results noting extent match. effect dimensions on performance studying adding rim edge large back reflector, well change radius two reflectors (large small), where it confirmed that best value for small (Rm=1λ) (Rs= 0.25 λ) respectively.