Circular polarization reconfigurable antenna for mid-band 5G applications with a new reconfigurable technique

Abstract

In this paper, a novel low cost, single-feed, and circular polarization reconfigurable antenna is designed and fabricated for future mid-band 5G applications. An innovative technique is used in this approach, which combines three techniques, namely: polygon U-slot, switchable vertical or horizontal slots, and shorting posts. The proposed antenna can alter its polarization sense between RHCP and LHCP with the ability to adjust the axial ratio position with respect to frequency along the impedance bandwidth of the antenna. The antenna is built on RT/duroid 5880 substrate with a maximum size of (31*31*3.15) .Two real diodes are integrated across the slot to change polarization sense. CST commercial software is used to simulate the antenna, and then it is fabricated and measured practically. Good agreements between the two results are achieved. However, The antenna has impedance bandwidth starting from 3.4995GHz to 3.73GHz with overlapped axial ratio bandwidth of 2.1% for both operation senses. Also, the antenna has good gain, and it has one resonant frequency at 3.6GHz for both operating states.

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

“…Therefore, it can be exploited for 5G and mobile communication applications which severely suffer from these kinds of interferences. In [16], a CP antenna is proposed with reconfigurable capability for switching between the left-hand and the right-hand CP for 5G mid-band applications. A wearable circularly polarized antenna for 5G and health care applications is proposed in [17] with the aid of metamaterial stacked structure.…”

Design and analysis of microstrip antenna with zig-zag feeder for wireless communication applications

“…UWB is one of the wideband wireless technology approval by the "Federal Communication Committee" (FCC) from 3.1 GHz to 10.6 GHz frequency band, this technology attracted both academic and industrial communities' attention [1], [2]. The microstrip antenna can be suitable for UWB technology, especially the slot antenna which is consisted of a microstrip feed line and tuning stub in the top layer of substrate and a special slot in the ground plane at bottom of the substrate, this type of antenna is distinguished it has large magnetic near-fields make it does not attract nearby objects, unlike a patch antenna that tends to couple with objects nearby [3], [4]. The proposed antenna consists of a ground plane that has a slot with a certain shape that can be any shape printed on a lower side of a dielectric substrate, and on the opposite side of a dielectric substrate there is a zig-zag microstrip feedline with a tuning stub, but when the coplanar waveguide (CPW) used as a feeding technique the tuning stub and a slot on a ground plane printed on the same side of a substrate.…”