Abstract
A very compact coplanar waveguide (CPW)-fed fractal monopole antenna with a modified ground plane is presented. The main objective is to obtain ultra wideband (UWB) characteristics from a simple microstrip monopole antenna. A wideband behaviour and good impedance matching are obtained by modifying the ground plane to semi-trapezoidal shape. Further, the self-similar fractal nature is introduced in the radiating element to enhance the bandwidth. The proposed antenna shows a wider impedance bandwidth from 3 GHz to 11.2 GHz for S11 &–10 dB. A fractional bandwidth of about 115.5% (impedance bandwidth ratio 3.73:1) is achieved for the third fractal iteration. The total volume of the presented antenna is 18×12×1.6 mm³. The measurements are carried out to validate the simulations and the performance of the proposed antenna is analysed.
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