Dual polarized circular microstrip space-fed antenna array design with high isolation and broad bandwidth

This paper presents a novel approach to design dual polarized antenna with high isolation and broad bandwidth using space-fed antenna arrays. The three layer stacked configuration is used for the antenna array design. Space-fed antenna array design removes the complexity and losses of the feed networks and achieves better efficiency. FR4 substrate of ε_r = 4.4, tan δ = 0.02 and h = 1.6 mm is used for low cost antenna design. The antenna is designed for 5.8 GHz frequency band. Antenna design is simulated using IE3D software and results are presented. Antenna isolation of better than 30 dB between two orthogonal ports and cross-polar level less than 40 dB has been achieved. The VSWR<;2 bandwidth is 13% and maximum antenna gain is 11.8 dBi. This antenna array can be extended to higher gain antenna design.