Compact CPW Fed Band-Notched Antenna for Portable UWB Applications

A compact band-notched CPW fed Ultra Wideband (UWB) antenna for portable UWB applications is proposed. The antenna is designed with the intention of reducing the dimensions of the radiating element without deteriorating its performance over the UWB range so that it can be incorporated within the physical limit specification of the USB plug footprint of Type-A. Also an electronically switchable quarter-wavelength notch filter designed for IEEE 802.11a has been incorporated into the system to avoid interference with existing WLAN communication. The antenna, fabricated on FR4 substrate (ε_r=4.4, thickness=1.6 mm) with a compact physical dimension of 9×30mm², offers a good impedance bandwidth from 3.0 to 11.4GHz. The radiation patterns were found to be omnidirectional. The gain and efficiency of the antenna are also reported. The antenna was looked upon for its behavior at the notch frequency (5.45GHz) which showed a good VSWR ≫2 affirming excellent filtering of the WLAN band starting from 5.1-5.8GHz.