Abstract
A novel CPW-fed monopole antenna with wideband circular polarization is proposed. The antenna consists of a basic rectangular monopole, fed by a 50 Ω microstrip line, through partial asymmetric impedance steps to attain wideband characteristics. On either side of the feed line, there are sections of partial, asymmetric ground planes. The ground plane on the left is appended with a rectangular stub and a step notch. Wideband circular polarization is achieved by using a strip around the upper end of the monopole and also by a parasitic modified Hilbert strip to the right of the monopole. The monopole, the upper parasitic strip and the modified parasitic Hilbert strip are coupled together by proximity coupling yielding the wide bandwidth. The antenna has been fabricated and the simulated and measured results were compared. The antenna has an impedance bandwidth ranging from 2.04 GHz to 7.95 GHz (118.2%) and an axial ratio bandwidth ranging from 3.6 GHz to 6.84 GHz (62%), thus covering the Wireless Local Area Network (WLAN) 5.2/5.8 GHz, the Worldwide interoperability for Microwave Access (WiMAX) 3.5/5.5 GHz and also partially covering the C-band (4–8 GHz). The antenna shows good radiation characteristics and obtains a reasonable gain over the entire operating frequency band.
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