REDUCTION OF MUTUAL COUPLING IN MIMO ANTENNA FOR BLUETOOTH/WIMAX/ WLAN APPLICATIONS

Abstract

This paper proposes a triband defective ground structure (DGS)-based MIMO antenna for 2.4 GHz Bluetooth, 3.5 GHz worldwide interoperability for microwave access (WiMAX), and 5.2 GHz wireless local networks (WLAN) applications. A half-rectangle microstrip patch antenna cut with an asymmetric feed line is used in the proposed MIMO design. Isolation is improved by 7 dB, and gain is increased by 2 dB when inner and outer ring circles are used as a DGS structure. The proposed antenna acquired a diversity gain (DG) of 9.94 dB and an envelope correlation coefficient (ECC) of 0.01 magnitudes. Moreover, this MIMO antenna covers bandwidths of 2.3 GHz-2.5 GHz, 3.4 GHz-3.8 GHz, and 5.2 GHz-5.8 GHz. The antenna's overall dimensions are 60 mm x 50 mm x 1.6 mm. The proposed antenna was designed, simulated, and measured using CSTMW studio, Schwarz ZVL vector network analyzer, and tested in an anechoic chamber.