Frequency reconfigurable wideband antenna for wireless application

A multiband frequency reconfigurable patch antenna is presented in this paper for wireless applications. The proposed antenna consists of E-shaped patch which is connected with two pin diodes placed at different position. On-Off combinations of PIN diodes are used to achieve reconfigurability. When all pin diodes are OFF, we get return loss of 19.7% at resonant frequency of 5.4GHz. Secondly when one diode is ON, we get return loss of 20.2% at resonant frequency 9.4GHz. Finally, when all patches are connected, we get return loss of 19 at resonant frequency 7.6GHz. Peak gain for all three cases is 5.5%, 8.3% and 5.09% dB. Proper optimization has been followed to get better Front to Back ration and efficiency with changes in patch's dimensions. By changing the feedline and port dimensions, enhanced impedance matching has been gained. VSWR for all three cases is less than 2. Radiation efficiency for all three cases are above than 90%. Radiation pattern for all three cases are omnidirectional. Ansoft HFSS v13.0 software is used for simulation of antenna. The dimension of antenna is 36*32.5mm2.