Super-Wideband Printed Asymmetrical Dipole Antenna

The proposed dipole antenna consists of two printed strips with unequal lengths and is fed by a coplanar strip (CPS) line. As the antenna parameters and port impedance are properly selected, a super wide operating band (jS11j < i10dB) of 3.5 to 20.0GHz is realized. Antenna samples were fabricated using standard PCB process. The area of the constructed dipole antenna is 40:0£5:0mm 2 . The S-parameter measurement was performed via a transition (CPS to double-sided parallel strip line) and transformer (190 to 50Ohm). The measured fractional bandwidth achieved 139.3% (from 3.4 to 19.0GHz) as predicted, over which the antenna peak gain is better than 0dBi.