A Reconfigurable Dual Sharp Notch-band UWB Antenna

This article presents a dual notch band Ultrawideband (UWB) reconfigurable antenna. The antenna consists of a radiation patch, coplanar ground, electromagnetic bandgap (EBG) structures, and switches. The lower edges of the radiating patch are truncated to enhance the antenna's UWB spectral bandwidth, and pairs of EBG structures are utilized to form sharp-notch characteristics. The antenna is made reconfigurable by using RF switches (diodes) and has four modes of operations. Based on the simulation results, the presented antenna operates at a bandwidth of 3.1-11.8 GHz for vertical bar S11 vertical bar<-10. The antenna is small in size having dimensions of 20 x 27 x 1.52 mm(3), and also offers a good radiation pattern and stable gain.