A Reconfigurable Square Slot Antenna with Switchable Single Band, UWB and UWB with Band Notch Function Performances

Abstract

In this paper a novel method for designing a square slot antenna with switchable single band, multi-resonance (Ultra-Wideband (UWB)) and UWB with band-notch function performances has been presented. By inserting a pair of symmetrical notches on the feed-line and a pair of gamma-shaped slots on the radiating stub, additional resonances are excited and hence much wider impedance bandwidth is produced; especially at the higher band. In order to generate a reconfigurable band-notch function, a PIN diode is utilized across the microstrip stub between the two gamma-shaped slots. Also, through implementation of two H-shaped slots on the ground plane, not only the coupling at lower and middle frequencies is adjusted, but also by embedding a PIN diode between these two H- shaped slots, an additional reconfigurable functionality is added to the antenna performances; which can switch between a single band and multi-resonance (UWB) characteristics. The designed antenna has a small size of 20×20 mm 2 while simulated and experimental results