Frequency Re-configurable Quad-band Notched Antenna for UWB Applications

A re-configurable Quad-band notched UWB antenna is designed and investigated in this article. A basic rectangular patch antenna is designed first and modified to achieve UWB characteristics. Further, to accomplish Quad band notch characteristics, four U-shape slots are incorporated above the radiating surface of the patch antenna. A broad impedance bandwidth that extends from 2.3GHz to 14GHz with four notches centered at 3.4GHz (3.1-3.5GHz), 3.8GHz (3.6GHz-4GHz), 4.6GHz (4.58GHz-4.74GHz) and 5.2GHz (5.14GHz-5.3GHz) have been successfully achieved. By incorporating four PIN diodes, total sixteen re-configurable states have been attained in the UWB spectrum. The proposed antenna model is successfully designed to reject interference from WiMAX, downlink C-band for satellite, INSAT and WLAN respectively.