New Design of CPW-Fed Rectangular Slot Antenna for Ultra Wideband Applications

A printed rectangular slot antenna excited by a 50 Ω Co-Planar Waveguide with a triangular shaped tuning stub is proposed for UWB applications. The triangular shaped tuning stub is used to remove the high and low frequency limitations of UWB operation, improving the impedance matching. A prototype has been designed and fabricated and both the impedance bandwidth and radiation characteristics are experimentally studied. Experimental result shows that impedance bandwidth of 131% (|S 11 | < -10 dB) is well achieved when the antenna is fed by a CPW feed with a triangular shaped tuning stub. The impedance bandwidth and radiation characteristics have also been investigated by using ADS simulation software. The measured and simulated results show excellent agreement.