Small-Size and High-Isolation MIMO Antenna for WLAN

ETRI Journal

关键词: WLAN;    MIMO;    isolation;    envelop correlation coefficient;    Diversity;   

Others  :  1186439
DOI  :  10.4218/etrij.12.0211.0083

【 摘 要 】

A small-sized (15 mmx30 mm) planar monopole MIMO antenna that offers high-isolation performance is presented in this letter. The antenna is miniaturized using inductive coupling within a meander-line radiator and capacitive coupling between a radiator and an isolator. High isolation is achieved by a T-shaped stub attached to the ground plane between two radiators, which also contributes to the small size using a folded structure and the capacitive coupling with radiators. The proposed antenna operates for the WLAN band within 2.4 GHz to 2.483 GHz. The measured isolation (S₂₁) is about -30 dB, and the envelope correlation coefficient is less than 0.1.

   

【 参考文献 】

• [1]S. Blanch, J. Romeu, and I. Corbella, "Exact Representation of Antenna System Diversity Performance from Input Parameter Description," IET Electron. Lett., vol. 39, no. 9, May 2003, pp. 705-707.
• [2]F. Yang and Y. Rahmat-Samii, "Microstrip Antennas Integrated with Electromagnetic Band-Gap (EBG) Structures: A Low Mutual Coupling Design for Array Applications," IEEE Trans. Antennas Propag., vol. 51, no. 10, Oct. 2003, pp. 2936-2946.
• [3]F.G. Zhu, J.D. Xu, and Q. Xu, "Reduction of Mutual Coupling between Closely-Packed Antenna Elements Using Defected Ground Structure," IET Electron. Lett., vol. 45, no. 12, July 2009, pp. 601-602.
• [4]K.J. Kim and K.H. Ahn, "The High Isolation Dual-Band Inverted F Antenna Diversity System with the Small N-Section Resonators on the Ground Plane," Microw. Opt. Technol. Lett., vol. 49, no. 3, Mar. 2007, pp. 731-734.
• [5]A.C.K. Mak, C.R. Rowell, and R.D. Murch, "Isolation Enhancement between Two Closely Packed Antennas," IEEE Trans. Antennas Propag., vol. 56, no. 11, Nov. 2008, pp. 3411-3419.
• [6]S. Zhang, J. Xiong, and S. He, "MIMO Antenna System of Two Closely-Positioned PIFAs with High Isolation," IET Electron. Lett., vol. 45, no. 15, July 2009, pp. 771-773.
• [7]T.S. Yoon, W.S. Cho, and C.O. Kim, "Fabrication of Meander and Spiral Type Micro Inductors," J. Mater. Sci. Technol., vol. 16, no. 2, Oct. 2000, pp. 236-237.