Dual-beam dielectric image line tapered antenna in planar environment

A dual-beam antenna designed using tapered dielectric image line (DIL) in Ku-band (12-18 GHz) is presented in this paper. The antenna is fed centrally by probe fed substrate integrate waveguide (SIW) power divider made on same substrate which makes the design fully planar. The proposed antenna is simulated by using Ansot HFSS. The proposed antenna provides two main beam directed at 72° and -72° from broadside almost independent of frequency throughout the operating band. The maximum gain achieved is 12.2 dBi in both main beam directions and the impedance bandwidth (S₁₁<; -10 dB) is 41.8% (13.6-20.8 GHz). The proposed antenna also provides good cross polarization level in both E and H-plane.