Compact circularly polarized MIMO printed antenna withnovel ground structure for wideband applications

摘要

In this article, a microstrip line fed 2-port circularly polarized multiple-inputmultiple-output (MIMO) antenna is designed and fabricated. A novel groundstructure and radiating patches are used to achieve the circularly polarizedradiated field by the MIMO antenna. To improve the isolation between twoports, a meandered U-shaped narrow metallic strip is placed between theasymmetric Z-shaped radiating elements. The proposed MIMO design demonstratesthe impedance bandwidth (S11 ≤ -10 dB) of 90.94% (3.04-8.11 GHz).The axial ratio bandwidth ≤3 dB is found to be 32.10% (4.42-6.11 GHz). Thediversity parameters such as envelope correlation coefficient, diversity gain,mean effective gain, total active reflection coefficient and channel capacity lossare also calculated to make the proposed design more reliable for 5G applications.This antenna is made compact and small which carries the dimension24 × 24 × 1.6 mm~3. The entire investigation is first modeled using the simulationsoftware CST Microwave Studio and then verified with the measuredresults.