volume | PIER Journals

Abstract

A low-cost, high isolation, printed loop-antenna system for multiple-input multiple-output (MIMO) applications in the 2.4 GHz WLAN band is presented. By feeding the orthogonal eigenmodes of the array, port decoupling (S₂₁< -20 dB) with tightly coupled elements (only 0.07λ separation) is obtained. The orthogonal eigenmodes are realized based on 180° coupler. Then decoupled external ports of the feed network may be matched independently by using conventional matching circuits. With this low-cost and high isolation characteristic, it is very suitable for being embedded inside a wireless access point (AP).

1. Su , S.-W. and C.-T. Lee, "Low-cost dual-loop-antenna system for dual-WLAN-band access points," IEEE Trans. on Antennas and Propag., Vol. 59, 1652-1659, 2011.
doi:10.1109/TAP.2011.2123070 Google Scholar

2. Diallo , A., C. Luxey, P.-L. Staraj, R. Staraj, and G. Kossiavas, "Efficient two-port antenna system for GSM/DCS/UMTS multi-mode mobile phones," Electronic Letters, Vol. 43, 369-370, 2007.
doi:10.1049/el:20073911 Google Scholar

3. Diallo, A., C. Luxey, P. L. Thuc, R. Staraj, and G. Kossiavas, "Study and reduction of the mutual coupling between two mobile phone PIFAs operating in the DCS1800 and UMTS bands," IEEE Trans. Antennas Propag., Vol. 54, 2006.
doi:10.1109/TAP.2006.883981 Google Scholar

4. Kim, I., C. Won Jung, Y. Kim, and Y. Eil Kim, "Low-profile wideband MIMO antenna with suppressed mutual coupling between two antennas," Microw. Opt. Technol. Lett., Vol. 50, 1336-1339, 2008.
doi:10.1002/mop.23368 Google Scholar

5. Tounou, C., C. Decroze, D. Carsenat, T. Monediere, and B. Jecko, "Diversity antennas e±ciencies enhancement," Proc. IEEE Antennas Propag. Int. Symp., 1064-1067, Honolulu, HI,Jun. 2007. Google Scholar

6. Chiu , C.-Y., C.-H. Cheng, R. D. Murch, and C. R. Rowell, "Reduction of mutual coupling between closely-packed antenna elements," IEEE Trans. on Antennas and Propag., Vol. 55 , 1732-1738, 2007.
doi:10.1109/TAP.2007.898618 Google Scholar

7. Chaloupka, H. J., X. Wang, J. C. Coetzee, "Superdirective 3-element array for adaptive beamforming," Microw. Opt. Technol. Lett., 425-430, 2003.
doi:10.1002/mop.10782 Google Scholar

8. Chaloupka, H. J., X. Wang, and J. C. Coetzee, "Performance enhancement of smart antennas with reduced element spacing," Proc. IEEE Conf. Wireless Communications and Networking, Vol. 1, 425-430, 2003. Google Scholar

9. Anderson, J. B. and H. H. Rasmussen, "Decoupling and descattering networks for antennas," IEEE Trans. Antennas Propag., Vol. 24, 841-846, 1976.
doi:10.1109/TAP.1976.1141437 Google Scholar

10. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," IET Electron. Lett., Vol. 39, 705-707, 2003.
doi:10.1049/el:20030495 Google Scholar

Dr. Shaoli Zuo

Professor Ying-Zeng Yin

Dr. Zhi-Ya Zhang

Dr. Wei-Jun Wu

Dr. Jiao-Jiao Xie