Design and optimization of ultra wide band monopole antenna with DGS for microwave imaging

A compact, low profile UWB monopole antenna is presented for Ultra wideband applications. A Monopole reference antenna design on the FR4 substrate of size 28.3 × 24 mm
²
without defected ground structure (DGS) and results are analyzed in terms of impedance bandwidth, mutual coupling, radiation patterns and antenna gain with the help of CST Microwave studio and then proposed UWB monopole antenna is also design on the same substrate with DGS. All the results are also simulated and analyzed for the same. A comparative study carried out between these two designs and analyzed that proposed UWB monopole antenna enhanced impedance bandwidth from 3.7 GHz–14.9 GHz(without DGS) to 3.4 GHz–20 GHz (with DGS) and group delay is also satisfactory, which makes the proposed antenna is a good candidate for portable UWB applications.