A Metamaterial based Multiband Frequency Reconfigurable Antenna for Wireless Applications

A metamaterial loaded multiband frequency reconfigurable antenna is reported. The antenna has a size of $0.34\lambda_{l} \times 0.34\lambda_{l} \times 0.02\lambda_{l}$, at a lower frequency of 3.95 GHz. The antenna consists of two metamaterial, namely, Circular Complimentary Split Ring Resonator (CCSRR) and Hexagonal Complimentary Split Ring Resonator (HCSRR), which independently controls the band at 3.95 and 5.72 GHz, respectively. The proposed antenna shows resonance at 3.95, 5.72 and 8.3 GHz, with fractional bandwidths of about 5.12% (3.8-4 GHz), 2.33% (5.51-5.64 GHz) and 4.22% (8.1-8.45 GHz). Frequency reconfiguration in the proposed antenna is achieved by utilizing two metallic switches, by placing them between the rectangular slot present in the radiating part and the ground plane. When both the switches are ON antenna operates at single band. When either of the switch is ON antenna operates at dual band. When both the switches are OFF, antenna operates at triple band. Acceptable gain, stable radiation pattern and good impedance matching are observed across the operating bandwidths.