Linear dual-polarized microstrip patch antenna with U-shaped aperture

Abstract

In this paper, a small size, high-gain, linear dual-polarized U-shaped aperture antenna for 5G communication systems is presented. The U-shaped aperture is used to in-crease impedance matching and coupling level, while allowing dual-polarization operation at the same time. This antenna is composed of two substrates separated by air gap. The square radiating element is positioned beneath the upper substrate and is fed by two orthogonal feed lines located beneath the lower substrate. The electromagnetic waves are connected to the radiating element through two U-shaped apertures cut in the ground plane, located above the lower substrate. According to the simulation results, the antenna's gain and directivity are 6.89dB and 7.09dBi, respectively, with excellent isolation between the two ports and a high radiating efficiency of more than 90%. The suggested antenna is designed using RO4003 substrate with a thickness of 0.813 and a dielectric constant of 3.5. The antenna is modeled and simulated using Finite Integration Technique (FIT).