volume | PIER Journals

Abstract

This article presents a simple structure for reducing mutual coupling between two diversity planar monopole antennas for WLAN 5.2/5.8 GHz applications. The structure has two λ/4 (λ-wavelength in the substrate) slots cut into the ground plane between the two monopoles. In 0.5 λ_o (λ_o,-wavelength in the air) of the antenna spacing, mutual coupling was -33.3, -21.1 dB at 5.2, 5.8 GHz, respectively. The lowest mutual coupling of -33.3 dB was achieved at 5.2 GHz, which is 20.8 dB improvement over the reference.

1. Usman, M., R. A. Abd-Alhameed, and P. S. Excell, "Design considerations of MIMO antennas for mobile phones," PIERS Online, Vol. 4, No. 1, 121-125, 2008. Google Scholar

2. Che, Y. B., Y. C. Jiao, F. S. Zhang, and H. W. Gao, "A novel small CPW-fed T-shaped antenna for Mimo system applications," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 14, 2027-2036, 2006.
doi:10.1163/156939306779322774 Google Scholar

3. Kim, I., C. W. Jung, Y. Kim, and Y. E. Kim, "Low-profile wide-band MIMO antenna with suppressed mutual coupling between two antennas," Microw. Opt. Technol. Lett., Vol. 50, No. 5, 1336-1339, 2008.
doi:10.1002/mop.23368 Google Scholar

4. Min, K.-S., M.-S. Kim, C.-K. Park, and M. D. Vu, "Design for PCS antenna based on WIBRO-MIMO," Progress In Electromagnetics Research Letters, Vol. 1, 77-83, 2008.
doi:10.2528/PIERL07111810 Google Scholar

5. Gao, G.-P., X.-X. Yang, and J.-S. Zhang, "A printed volcano smoke antenna for UWB and WLAN communications," Progress In Electromagnetics Research Letters, Vol. 4, 55-61, 2008.
doi:10.2528/PIERL08051102 Google Scholar

6. Koo, B.-W., M.-S. Baek, and H.-K. Song, "Multiple antenna transmission technique for UWB system," Progress In Electromagnetics Research Letters, Vol. 2, 177-185, 2008.
doi:10.2528/PIERL08011101 Google Scholar

7. Abouda, A. A. and S. G. Hggman, "Effect of mutual coupling on capacity of MIMO wireless channels in high SNR scenario," Progress In Electromagnetics Research, Vol. 65, 27-40, 2006.
doi:10.2528/PIER06072803 Google Scholar

8. Kim, I., C. W. Jung, Y. Kim, and Y. E. 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

9. Tounou, C., C. Decroze, D. Carsenat, T. Monédière, and B. Jécko, "Diversity antennas efficiencies enhancement," Proc. IEEE Antennas Propag. Int. Symp., 1064-1067, Honolulu, HI, June 2007. Google Scholar

10. 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

11. Sievenpiper, D., L. Zhang, R. F. J. Broas, N. G. Alexopolous, and E. Yablonovitch, "High-impedance electromagnetic surfaces with a forbidden frequency band," IEEE Microw. Theory Tech., Vol. 47, 2059-2074, 1999.
doi:10.1109/22.798001 Google Scholar

12. Yang, F. 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, 2936-2946, 2003.
doi:10.1109/TAP.2003.817983 Google Scholar

13. Li, L., B. Li, H. X. Liu, and C. H. Liang, "Locally resonant cavity cell model for electromagnetic band gap structures," IEEE Trans. Antennas Propag., Vol. 54, 90-100, 2006.
doi:10.1109/TAP.2005.861532 Google Scholar

14. Fu, Y. Q., Q. R. Zheng, Q. Gao, and G. H. Zhang, "Mutual coupling reduction between large antenna arrays using electromagnetic bandgap (EBG) structures," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 6, 819-825, 2006.
doi:10.1163/156939306776143415 Google Scholar

15. Ganatsos, T., K. Siakavara, and J. N. Sahalos, "Neural networkbased design of EBG surfaces for effective polarization diversity of wireless communications antenna systems," PIERS Online, Vol. 3, No. 8, 1165-1169, 2007.
doi:10.2529/PIERS070215124728 Google Scholar

16. Ahn, D., J. S. Park, C. S. Kim, J. Kim, Y. Qian, and T. Itoh, "A design of the low-pass filter using the novel microstrip defected ground structure," IEEE Microw. Theory Tech., Vol. 49, 86-93, 2001.
doi:10.1109/22.899965 Google Scholar

17. Caloz, C., H. Okabe, T. Iwai, and T. Itoh, "A simple and accurate model for microstrip structures with slotted ground plane," IEEE Microwave Wireless Comp. Lett., Vol. 14, 133-135, 2004.
doi:10.1109/LMWC.2004.828725 Google Scholar

18. Salonen, I. and P. Vainikainen, "Estimation of signal correlation in antenna arrays," Proc. JINA, 383-386, Nice, France, November 2, 2002. Google Scholar

19. Brachat, P. and C. Sabatier, "Réseau d'antennes à 6 capteurs en diversité de polarisation," Proc. JINA, Nice, France, November 2004. Google Scholar

20. 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

21. Thaysen, J. and K. B. Jakobsen "Envelope correlation in (N，N) MIMO antenna array from scattering parameters," Microwave and Optical Technology Letters, Vol. 48, 832-834, 2006. Google Scholar

Dr. Shaoli Zuo

Professor Ying-Zeng Yin

Dr. Wei-Jun Wu

Dr. Zhi-Ya Zhang

Dr. Jie Ma