Compact Size and Thin Substrate Ultra-Wideband Antenna for 5G Applications

This paper presents the ultra-wideband (UWB) performance, low-profile (0.0254.0), compact size, high gain, and low cross-polarization level. This is achieved by implementing a radiating circular patch, a hexagonal patch, and two circular slots on the top of the antenna. Circular and hexagonal patches helped to obtain a wider bandwidth. Additionally, a rectangular patch is added in the ground part to provide better impedance matching without effect on the other antenna parameters. The antenna was designed, fabricated, and tested to validate the simulation results. The measured absolute impedance bandwidth of 23 GHz, the average peak realized gain of 6.9 dBi, the average radiation efficiency (simulated) of 73.5%, and the cross-polarization level below -22 dB has been achieved at the whole band (4-27 GHz). The measured results are obtained to be in good agreement with the simulation data. In addition, the antenna provides a compact size. In the end, a comparison table is provided with the state-of-the-art.