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The proposed antenna presents a dual-band monopole antenna with a wide axial ratio bandwidth, by using the modified ground plane. The tilted inverted L-shaped strip with an angle of  α  is printed on the FR4-epoxy substrate and is excited by the microstrip feedline. The overall dimension of the proposed antenna is 0.408 λ0  × 0.326 λ0  × 0.013 λ0 . The ground plane has been modified by introducing a Y-shaped strip, cutting a slot and connecting a stub for improving the characteristics of antenna performance. The design and simulation have been carried out by the EM simulator HFSS v.15 software. Once the antenna design is completed, the proposed antenna is fabricated and various characteristics are measured. The proposed antenna exhibits two distinct bands along with the percentage impedance bandwidths and axial ratio bandwidths of 75.32% (resonant at 2.35 GHz), 14.26% (resonant at 6.1 GHz) and 55.88% (center at 2.845 GHz), 15.96% (center at 6.075 GHz), respectively. The measured results are experimentally verified with simulated results and a good agreement is found between them. The measured impedance bandwidth, axial ratio and gain are good enough for commercial bands of wireless communication systems such as Bluetooth, Wi-Fi, WLAN, and WiMAX.

Dual-Band Monopole Antenna with Wide Axial Ratio Bandwidth for Wireless Systems