Reconfigurable Notch Band Monopole Slot Antenna for WLAN/IEEE-802.11n Applications

Abstract

This article presents a compact dual band antenna for WLAN/IEEE-802.11n applications with frequency reconfigurability nature. The resonant modes are achieved through slots incorporated in the radiating structure and tunability in the band is achieved by PIN diodes switching. The proposed monopole slot antenna with dimensions of 55 X 52 X 1.6 mm placed on Rogers RT-duroid substrate of permittivity 2.2 and loss tangent 0.0009. The changes in first and second resonant frequencies are attained with switching of diodes connected between slot gaps. The switching properties of the diodes are utilized in optimum way to notch certain frequencies and to choose operation frequencies. Low cross polarization with stable radiation pattern and average gain of 2.8 dB are the key elements for this novel antenna. The designed antenna is showing good impedance bandwidth of 68% and peak realized gain of 4.86 dB at 5.6 GHz WLAN band. A good matching between measured results and simulation studies are obtained from the current antenna design.