volume | PIER Journals

Abstract

An innovative decoupling microstrip antenna array is designed. In the design approach, a decoupling and folding microstrip circuit is proposed instead of lumped element circuit, so that the circuit structure is simplified, and the antenna array is fabricated easily in print. Inverted L shape is used as its radiator in order that the size of the antenna array is miniaturized. Stepped impedance transformer is added for the sake of weakening ports reflection. The simulation and measurement results show that the proposed antenna array works at 2.45 GHz, and its reflection coefficient and isolation are both below -20 dB in the working band (2.4 GHz-2.48 GHz). The proposed antenna array has patterns close to omnidirectional.

1. Shannon, C. E., "A mathematical theory of communication," Bell System Technical Journal, Vol. 27, No. 3, 379-423, 1948.
doi:10.1002/j.1538-7305.1948.tb01338.x Google Scholar

2. Andersen, J. B., "Array gain and capacity for known random channels with multiple element arrays at both ends," IEEE J. Select. Areas Commun., Vol. 18, 2172-2178, Nov. 2000. Google Scholar

3. Cui, S., Y. Liu, and W. Jiang, "Compact dual-band monopole antennas with high port isolation," Electronics Lett., Vol. 47, No. 10, 579-58, May 2011.
doi:10.1049/el.2010.3603 Google Scholar

4. Lu, S., H. T. Hui, and M. Bialkowski, "Performance analysis of multiple-input multiple-output orthogonal frequency division multiplexing systems under the influence of antenna mutual coupling effect," IET Microwaves, Antennas & Propagation, Vol. 3, No. 2, 288-295, March 2009.
doi:10.1049/iet-map:20070302 Google Scholar

5. Hui, H. S. and H. T. Lui, "Effective mutual coupling compensation for direction-of-arrival estimations using a new, accurate determination method for the receiving mutual impedance," Journal of Electromagnetic Waves & Applications, Vol. 24, 271-281, 2010. Google Scholar

6. Yeung, L. K. and Y. E.Wang, "Mode-based beamforming arrays for miniaturized platforms," IEEE Trans. Microwave Theory and Techniques, Vol. 57, No. 1, 45-52, Jan. 2009.
doi:10.1109/TMTT.2008.2008944 Google Scholar

7. Xu, H., G. Wang, and M. Qi, "Hilbert-shaped magnetic waveguided metamaterials for electromagnetic coupling reduction of microstrip antenna array," IEEE Trans. Magnetics, Vol. 49, No. 4, 1526-1529, Apr. 2013.
doi:10.1109/TMAG.2012.2230272 Google Scholar

8. Yeung, L. K. and Y. E. Wang, "A decoupling technique for compact antenna arrays in handheld terminals," IEEE Trans. Radio and Wireless Symposium (RWS), 80-83, New Orleans, LA, 2010. Google Scholar

9. Kim, I., W. J. Kim, Y. Kim, and Y. E. Kim, "Low-profile wideband MIMO antenna with suppressing mutual coupling between two antennas," Microwave and Optical Technology Lett., Vol. 50, No. 5, 1336-1339, 2008.
doi:10.1002/mop.23368 Google Scholar

10. Luo, C. M., J. S. Hong, and L. L. Zhong, "Isolation enhancement of a very compact UWB-MIMO slot antenna with two defected ground structures," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 1766-1769, Apr. 2015.
doi:10.1109/LAWP.2015.2423318 Google Scholar

11. Zhu, J. and G. V. Eleftheriades, "A simple approach for reducing mutual coupling in two closely spaced metamaterial-inspired monopole antennas," IEEE Antennas and Wireless Propagation Letters, Vol. 9, No. 1, 379-382, 2010. Google Scholar

12. Dadashzadeh, G., A. Dadgarpour F. Jolani, and B. S. Virdee, "Mutual coupling suppression in closely spaced antennas," IET Microwaves Antennas & Propagation, Vol. 5, No. 1, 113-125, 2011.
doi:10.1049/iet-map.2009.0564 Google Scholar

13. Park, S. and C. Jung, "Compact MIMO antenna with high isolation performance," IET Electronics letters, Vol. 46, No. 6, 390-391, 2010.
doi:10.1049/el.2010.3301 Google Scholar

14. Chen, S. C., Y. S. Wang, and S. J. Chung, "A decoupling technique for increasing the port isolation between two strongly coupled antennas," IEEE Trans. Antennas and Propagation, Vol. 56, No. 12, 3650-3658, Dec. 2008.
doi:10.1109/TAP.2008.2005469 Google Scholar

15. Tang, X., K. Mouthaan, and J. C. Coetzee, "Tunable decoupling and matching network for diversity enhancement of closely spaced antennas," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 268-271, 2012.
doi:10.1109/LAWP.2012.2188773 Google Scholar

16. Pozar, D M., Microwave Engineering, Wiley. com, 2009.

17. Zhao, L., L. K. Yeung, and K. L. Wu, "A novel second-order decoupling for two-element compact antenna arrays," Microwave Conf., Asia-Pacific, 1172-1174, 2012. Google Scholar

18. Zhao, L., L. K. Yeung, and K. L. Wu, "A coupled resonator decoupling network for two-element compact antenna arrays in mobile terminals," IEEE Trans. Antennas and Propagation, Vol. 62, No. 5, 2767-2776, May 2014.
doi:10.1109/TAP.2014.2308547 Google Scholar

19. Zhao, L. and K. L. Wu, "A dual-band coupled resonator decoupling network for two coupled antennas," IEEE Trans. Antennas and Propagation, Vol. 63, No. 7, 2843-2850, Jul. 2015.
doi:10.1109/TAP.2015.2421973 Google Scholar

20. Lui, H.-S., H. T. Hui, and M. S. Leong, "A note on the mutual-coupling problems in transmitting and receiving antenna arrays," IEEE Antennas and Propagation Magazine, Vol. 51, No. 5, 171-176, Oct. 2009. Google Scholar

Dr. You-Bao Wang

Dr. Shun Xiao

Dr. Bo Zhang

Dr. Ye Wei