A compact CPW-fed double T-Shaped antenna is proposed for dual-band wireless local area network (WLAN) operations. For the proposed antenna, the -10 dB return loss bandwidth could reach about 25.5% for the 2.4 GHz band and 5.7 % for the 5 GHz band, which meet the required bandwidth specification of WLAN standard. To reduce the mutual coupling and get high isolation between two dual-band antennas, we proposed the novel electromagnetic band gap (EBG) structures. When the EBG structure is employed, a -13dB and -30dB mutual coupling reduction is achieved at 2.4 and 5.2 GHz. It shows that the features of small size, uniplanar structure, good radiation characteristics and small mutual coupling are promising for multi-input multi-output (MIMO) applications.
L. Zhang, Y. C. Jiao, G. Zhao, Y. Song, and F. S. Zhang, “Broadband dual-band CPW-Fed closed rectangular ring monopole antenna with a vertical strip for WLAN operation,” Microwave and Optical Technology Letters, Vol. 50, No. 7, pp. 1929–1931, 2008.
F. Yang and Y. Rahmat-Samii, “Microstrip antennas integrated with electromagnetic band-gap (EBG) struc-tures: A low mutual coupling design for array appli-cations,” IEEE Transactions Microwave Theory Tech-niques, Vol. 51, pp. 2936–2946, October, 2003.
H. K. Xin, M. K. Matsugatani, J. Hacker, J. A. Higgins, M. Rosker, and M. Tanaka, “Mutual coupling reduction of low profile monopole antennas on high-impedance ground plane,” Electronics Letters, Vol. 38, No. 16, pp. 849–850, August, 2002.