A simple semi-circular arc shaped frequency and polarization reconfigurable antenna

Abstract

A simple semi-circular shaped antenna having frequency as well as polarization reconfigurability is presented in this work. The proposed antenna has a size of 70.4 × 67.5 × 1.52 mm3. This antenna consists of three switches (S1, S2 and S3) which have been used to attain frequency reconfigurability and polarization reconfigurability in both LP (linear polarization) and CP (circular polarization). When switch S1 is OFF and any of switch S2/S3 is ON then we are obtaining frequency at Single Band (2.4 GHz). When Switch S1 is ON and any of the Switch S2/S3 is OFF then we are obtaining frequency at dual Band (2.4 GHz and 5.52 GHz). When all the switches S1, S2 and S3 are ON at the same time then we are obtaining frequency at Single Band (5.52 GHz). The simulated fractional bandwidth of the lower band centred at 2.4 GHz is observed to be 17.4% and for the upper band centred at 5.52 GHz is observed to be 5%. Proposed antenna gain greater than 2dBi is obtained for all five cases along with less than 2 VSWR with excellent radiation efficiency. The proposed reconfigurable antenna is suitable for Bluetooth and WLAN application.