Isolation Enhancement in Microstrip Patch Antennas for WiMAX Applications

Abstract

Microstrip patch antennas with mutual coupling are proposed for WiMAX applications. To reduce mutual coupling between patch antennas using different methods like Split Ring Resonators (SRR), Slotted Meander Line Resonators (SMLR), Wave Guided Meta Materials (WG-MTM) and Planar-Electromagnetic Band Gap (P-EBG) structures are designed for WiMAX applications. In all four methods, antennas are engraved on 15x10 mm2 FR4 substrate. The antenna is designed by applying FR4 substrate with thickness 3mm, permittivity 4.6. The proposed antennas are modeled using ADS software. The simulated result shows that the proposed antennas are optimized for 5.8 GHz resonant frequency. By comparing all four methods Split Ring Resonators only having more isolation of -37.5 dB and the return loss of -16.5 dB. The characteristics like return loss, radiation pattern, gain, directivity etc. are computed for all the designed antennas. These features show that the proposed patch antenna with SRR structure is well suited for WiMAX application compared to other three methods.