Reconfigurable band-notched small square slot antenna with enhanced bandwidth for octave-band, multiresonance applications

Abstract

In this article, a novel multiresonance small square slot antenna with reconfigurable band-notch performance, for octave-band multiresonance applications is proposed. The proposed antenna consists of a modified radiating stub and a ground plane with two rectangular slots with protruded T-shaped strips inside the slots which provides a wide usable fractional bandwidth of more than 165% (2.49–24.53 GHz). By cutting two modified rectangular slots with protruded T-shaped strips with variable dimensions on the corners of ground plane, additional resonances are excited, and hence, much wider impedance bandwidth can be produced, especially at the middle and higher band. Furthermore, to achieve a reconfigurable function, a pin diode is utilized across the T-ring slot. When this pin diode is biased forwardly the band-notched resonance is excited. Unlike other antennas reported in the literature to date, the proposed antenna displays a good omnidirectional radiation pattern even at higher frequencies. The designed antenna has a small size of 20 × 20 mm . Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1960–1965, 2014