Ring Slotted Circularly Polarized U-Shaped Printed Monopole Antenna for Various Wireless Applications

In this communication, the design and performance of micro strip line feed U-shaped printed monopole antenna for Bluetooth/WI-MAX/WLAN communications systems is reported. The proposed monopole antenna has an eight shaped slot on the patch and an eight shaped ring structure in the ground with a metallic reflector beneath the ground plane. The CST Microwave Studio 2014 used for the simulation analysis of antennas while measurements performed by applying Vector Network Analyzer (R&SZVA 40). This radiating structure provides triple broad impedance bandwidths, i.e. 265MHz (in 2.280 GHz to 2.545 GHz frequency range), 116 MHz (in 2.660 GHz to 2.776 GHz frequency range) & 2.12 GHz (in 3.83 GHz to 5.956 GHz frequency range), wider 3dB axial ratio bandwidth 1.33 GHz (in 4.69GHz to 6.02GHz range), nearly flat gain (with maximum gain close to 5.56 (dBi) and good radiation patterns in the desired frequency range. This antenna may be a useful structure for 2.45GHz Bluetooth communication band as well as in WLAN & WI-MAX communications bands.