Frequency reconfigurable antenna inspired by metamaterial for WLAN and WiMAX application

A frequency reconfigurable antenna inspired by metamaterial for WLAN and WiMAX application was presented. Two different antenna was proposed namely antenna (1) & antenna (2). Antenna (1) is designed to resonates at 5.2 GHz(WLAN Band) with impedance bandwidth 1.4407 GHz. The Antenna (2) is the extension of antenna (1). Two resonating particles in antenna (2) excited by dynamic magnetic field which produces negative permeability due to coupling with the monopole antenna; the whole structure is now a tri-band antenna. The antenna (2) sometimes produces tri-band resonates at 3.5 GHz (middle WiMAX) & 5.56 GHz(Upper WiMAX band), 4.65 GHz having overall bandwidth 1.9356 GHz, sometimes produces dual bands 3.5GHz and 5.3 GHz(WiMAX and WLAN band) having overall bandwidth 1.6445GHz, sometimes at single band 5.15GHz (WLAN band) having impedance bandwidth 1.4917 GHz. By introducing a single switch at each metamaterial cell, their effect can be deactivated and their corresponding resonance can be eliminated, and that results a frequency reconfigurable antenna. The job of unit omega cell only to shift center frequency of monopole 5.2GHz(WLAN band) to 5.56 GHz(Upper WiMAX band application).All structures had simulated using Finite Element Method(FEM) based on HFSS.