Design and Analysis of 29 GHz Millimeter-waves Phased Array Antenna with Reduced Mutual Coupling

In this study, a multiple-input multiple-output (MIMO) antenna for wide scanning operating at 29 GHz is designed. Each element of the MIMO antenna is situated at a distance of λ/2. The proposed high isolation and wide scanning antenna combine to achieve the desired phased-array antenna. To minimize the mutual coupling between the radiators, slits are introduced in the radiating part. The MIMO antenna maintains a compact structure of 43.5 × 5.3 mm2, Roger’s 4350B laminated with a thickness of 0.8 mm was employed as a substrate. The proposed array has a very low mutual coupling of (S21< -24 dB), and realize gain of 9.3 dBi at a scanning angle of 70°, The antenna performance was studied in term of the S-parameter, beam scanning performances, and surface current distribution.