DRS tunable monopole antenna for dual band wireless LAN applications

摘要

Dielectric Resonator Antenna (DRA) plays a vital role in the wireless communication systems due to its support for wide impedance bandwidth and symmetrical radiation pattern. Dielectric Resonator Structures (DRS) combined with metallic structures reduce the antenna size at low frequency bands of operation. In this paper, a monopole antenna is designed to operate at 5.5 GHz and the antenna performance is identically shifted to 3.6 GHz by loading a cylindrical shape dielectric resonator structure over the monopole antenna. The DRS provides wider impedance bandwidth at lower resonant frequency with negligible dielectric losses. The dielectric resonating structure is designed using Bakelite with the dielectric constant (εr) of 4.8. The simulated monopole antenna with and without DRS is studied for its performance measures. The antenna performance is evaluated through fabrication of the DRS and monopole antenna. Dual band operation of the monopole antenna operating at 5.5 GHz and 3.6 GHz is achieved with the help of DRS. The designed and fabricated monopole antenna structure is suitable for wireless LAN applications.