Probe-Compensation-Fed Wideband Microstrip Antenna with U-Shaped Parasitic Elements for 5G/WLAN/WiMAX Applications

A single layer and single capacitive probe-compensation fed wideband patch antenna for 5G/WLAN/WiMAX applications, is presented and investigated. Two identical U-shaped parasitic patches are incorporated around the radiating edges and non-radiating edges of a rectangular patch. In order to maintain relatively small antenna size, the length and width of this rectangular patch is 1/2 lambda g and 1/4 lambda g, respectively. An annular gap is etched in the rectangular patch, which is concentric with the fed-probe. This annular gap can introduce an annular gap capacitor to compensate the inductance caused by the fed-probe. An additional resonant frequency is introduced by the U-shaped parasitic patches, which incorporates with the original resonant frequency produced by the rectangular patch, thus the wideband performance is achieved. The simulated impedance bandwidth with S-11 <=-10dB is 40% from 4.1GHz to 6.16 GHz, which covers 4.8-4.99GHz band of 5G operating in China, WLAN 5.2GHz(5.15-5.35GHz), WLAN 5.8GHz(5.725-5.825GHz), WiMAX 5.5GHz(5.25-5.85GHz). The simulated gains are 7.8dB at 4.34GHz and 4.6dB at 5.89GHz, respectively.