volume | PIER Journals

Abstract

A compact directional MIMO antenna operating in 2.4 and 5 GHz wireless local area network (WLAN) bands is presented. The compactness of the proposed multiple-input multiple-output (MIMO) antenna can be attained through using miniaturized antenna elements and meanwhile employing an extremely narrow edge-to-edge inter-element space (3 mm). Two novel miniaturized planar inverted-F antenna (PIFA) elements which share a common ground are designed, and each element has a dimension of 31 mm × 17 mm and a profile of 4.2 mm. By etching three slots on the ground, the port isolation can be significantly enhanced, which can even reach a maximum of 54 dB at 2.45 GHz. A desirable directional radiation pattern is obtained, and the calculated envelope correlation coefficient is better than 0.01.

1. Foschini, G. J., "Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas," Bell Labs Technical Journal, Vol. 1, No. 2, 41-59, 1996.
doi:10.1002/bltj.2015 Google Scholar

2. Varzakas, P., "Average channel capacity for Rayleigh fading spread spectrum MIMO systems," International Journal of Communication Systems, Vol. 19, No. 10, 1081-1087, 2006.
doi:10.1002/dac.784 Google Scholar

3. Zhang, S., S. N. Khan, and S. He, "Reducing mutual coupling for an extremely closely-packed tunable dual-element PIFA array through a resonant slot antenna formed in-between," IEEE Transactions on Antennas and Propagation, Vol. 58, No. 8, 2771-2776, 2010.
doi:10.1109/TAP.2010.2050432 Google Scholar

4. Li, G., H. Zhai, L. Li, C. Liang, R. Yu, and S. Liu, "AMC-loaded wideband base station antenna for indoor access point in MIMO system," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 2, 525-533, 2015.
doi:10.1109/TAP.2014.2378316 Google Scholar

5. Su, S. W., "High-gain dual-loop antennas for MIMO access points in the 2.4/5.2/5.8 GHz bands," IEEE Transactions on Antennas and Propagation, Vol. 58, No. 7, 2412-2419, 2010.
doi:10.1109/TAP.2010.2048871 Google Scholar

6. Su, S. W. and C.-T. Lee, "Low-cost dual-loop-antenna system for dual-WLAN-band access points," IEEE Transactions on Antennas and Propagation, Vol. 59, No. 5, 1652-1659, 2011.
doi:10.1109/TAP.2011.2123070 Google Scholar

7. Li, H., J. Xiong, Z. Ying, and S. L. He, "Compact and low prole co-located MIMO antenna structure with polarisation diversity and high port isolation," Electronics Letters, Vol. 46, No. 2, 108-110, 2010.
doi:10.1049/el.2010.2463 Google Scholar

8. Mallahzadeh, A. R., S. Es'haghi, and A. Alipour, "Design of an E-shaped MIMO antenna using IWO algorithm for wireless application at 5.8 GHz," Progress In Electromagnetics Research, Vol. 90, 187-203, 2009.
doi:10.2528/PIER08122704 Google Scholar

9. Farsi, S., H. Aliakbarian, D. Schreurs, and B. Nauwelaers, "Mutual coupling reduction between planar antennas by using a simple microstrip U-section," IEEE Antennas and Wireless Propagation Letters, Vol. 11, No. 4, 1501-1503, 2012.
doi:10.1109/LAWP.2012.2232274 Google Scholar

10. Qi, H., L. Liu, X. Yin, H. Zhao, and W. J. Kulesza, "Mutual coupling suppression between two closely spaced microstrip antennas with an asymmetrical coplanar strip wall," IEEE Antennas and Wireless Propagation Letters, Vol. 15, 191-194, 2016.
doi:10.1109/LAWP.2015.2437995 Google Scholar

11. Zhang, X.-Y., X. Zhong, B. Li, and Y. Yu, "A dual-polarized MIMO antenna with EBG for 5.8 GHz WLAN application," Progress In Electromagnetics Research Letters, Vol. 51, 15-20, 2015.
doi:10.2528/PIERL14112104 Google Scholar

12. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," Electronics Letters, Vol. 39, No. 9, 705-707, 2003.
doi:10.1049/el:20030495 Google Scholar

Dr. Xinyao Luo

Professor Jiade Yuan

Dr. Kan Chen