Analysis of a fractal Ultra Wide Band monopole antenna with reconfigurable notches

Abstract

This work describes the design and analysis of a fractal Ultra-Wide Band (UWB) coplanar fractal antenna with triple reconfigurable notch rejection bands. The investigation considers three successive configurations: coplanar monopole circular UWB antenna – Fractal coplanar monopole UWB band antenna with improved bandwidth – Slotted UWB structurewith reconfigurable notches. Reconfigurability is achieved by opening / short-circuiting appropriate slots to select the rejected band(s). This study has ended with three reconfigurable notches bands covering the frequency bands: [4.50 ?????? , 5.35 ??????] , [6.30 ?????? , 7.15 ??????] and [8.15 ?????? , 8.60 ??????] including Wi-Max and WLAN applications and X band. The Developed structure was printed on a 21x25x1.63 mm 3 glass epoxy FR-4 substrate. The input reflection coefficient has been measured where an agreement was observed betweensimulated and experimental results. The simulations concerning the input reflection coefficients, current distributions and radiation patterns were carried out using the CST Microwave Studio.