A New Design of a Circularly polarized Microstrip Patch Antenna Array for 5G Communication Systems

in this paper, a new microstrip circular polarization antenna array is designed fabricated and tested for 5G applications. The structure is based on an array of four rectangular patches geometrically placed and fed following specific 2 × 2 geometric pattern arrangement with a feeding mechanism to achieve circular polarization (CP) excitation. The antenna structure is fabricated on an FR4 substrate material, featuring a dielectric constant of 4.3, a low-loss tangent of 0.017, and a thickness of 1.6 mm. The design mainly consists of the geometric rotation of patch elements, each one fed with a 90° phase shift toward every adjacent element. The achieved axial ratio meets one to one performance over the antenna bandwidth indicating good CP performance. The proposed antenna array works at 3.5 GHz and exhibits good polarization features. The antenna array demonstrates good experimental performances in terms of high gain of 5.93 dBi, a very good return loss (RL) of 50 dB at the resonant frequency 3.5 GHz and a pass-band of 117 MHz. The measurement results show good agreement with simulations and the overall size is of 184×140 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>. The designed antenna array is suitable for 5G applications and other future communication systems.