volume | PIER Journals

Abstract

An effective technique utilizing neutralization lines to increase the isolation of a compact two-element dual-frequency microstrip antenna array is proposed in this paper. Two neutralization lines connect the two elements at the edge of each radiating patch. The positions and lengths of the two neutralization lines are studied to get the best performance of element isolation. A prototype of the proposed design was fabricated to validate the results. The measured results agree well with the simulated ones. It is shown that an increase of about 25 dB at the lower frequency and that of 17 dB at the upper frequency in isolation between the two antennas have been achieved.

1. Jensen, M. A. and J. W. Wallace, "A review of antennas and propagation for MIMO wireless communication," IEEE Trans. Antennas Propag., Vol. 52, No. 11, 2810-2824, 2004.
doi:10.1109/TAP.2004.835272

2. Song, L. and J. Shen, Evolved Cellular Network Planning and Optimization for UMTS and LTE, CRC Press, 2011.

3. Getu, B. and J. Andersen, "The MIMO cube — A compact MIMO antenna," IEEE Trans. Wireless Comm., Vol. 4, No. 3, 1136-1141, 2005.
doi:10.1109/TWC.2005.846997

4. Farsi, S., et al. "Mutual coupling reduction between planar antennas by using a simple microstrip U-section," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 1501-1503, 2012.
doi:10.1109/LAWP.2012.2232274

5. Li, Z., Z. Du, M. Takahashi, K. Saito, and K. Ito, "Reducing mutual coupling of MIMO antennas with parasitic elements for mobile terminals," IEEE Trans. Antennas Propag., Vol. 60, No. 2, 473-481, 2012.
doi:10.1109/TAP.2011.2173432

6. Lee, T.-I. and Y. Wang, "Mode-based information channels in closely coupled dipole pairs," IEEE Trans. Antennas Propag., Vol. 56, No. 12, 3804-3811, 2008.
doi:10.1109/TAP.2008.2007379

7. Yu, Y., Y. Jiang, W. Feng, S. Mbayo, and S. Chen, "Compact multiport array with reduced mutual coupling," Progress In Electromagnetics Research Letters, Vol. 39, 161-168, 2013.
doi:10.2528/PIERL13030902

8. Ou Yang, J., F. Yang, and Z. M. Wang, "Reducing mutual coupling of closely spaced microstrip MIMO antennas for WLAN application," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 310-310, 310.

9. Lin, D.-B., I.-T. Tang, and M.-Z. Hong, "A compact quad-band PIFA by tuning the defected ground structure for mobile phones ," Progress In Electromagnetics Research B, Vol. 24, 173-189, 2010.
doi:10.2528/PIERB10070608

10. Veeramani, A., et al. "Compact S-shaped EBG structures for reduction of mutual coupling," IEEE 2015 Fifth International Conference on Advanced Computing & Communication Technologies (ACCT), 2015.

11. Su, S. W., C. T. Lee, and F. S. Chang, "Printed MIMO-antenna system using neutralization-line Printed MIMO-antenna system using neutralization-line," IEEE Trans. Antennas Propag., Vol. 60, No. 2, 456-463, 2012.
doi:10.1109/TAP.2011.2173450

12. Cihangir, A., F. Ferrero, G. Jacquemod, et al. "Neutralized coupling elements for MIMO operation in 4G mobile terminals," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 141-144, 2014.
doi:10.1109/LAWP.2014.2298392

13. Yu, Y., L. Yi, X. Liu, and Z. Gu, "Dual-frequency two-element antenna array with suppressed mutual coupling," International Journal of Antennas and Propagation, Vol. 2015, 2015.

14. Sato, H., Y. Koyanagi, K. Ogawa, and M. Takahashi, "A method of dual-frequency decoupling for two-element MIMO antenna," PIERS Proceedings, 1853-1857, Stockholm, Aug. 12-15, 2013.

15. Li, L., F. Huo, Z. Jia, and W. Han, "Dual zeroth-order resonance antennas with low mutual coupling for MIMO communications," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 1692-1695, 2013.
doi:10.1109/LAWP.2013.2294686

16. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," Electronics Letters, Vol. 39, 705-707, 2003.
doi:10.1049/el:20030495

Dr. Yantao Yu

Dr. Lijun Yi

Dr. Xiaoya Liu

Dr. Zhaokai Gu