volume | PIER Journals

Abstract

MIMO systems have become an essential part in many communications networks and Long Term Evolution (4G) mobile communication systems. Mobile handsets using lower band of LTE (LTE-700 band) require antennas of reduced size that can be adapted to the limited space in the handset. This paper presents the design, optimization and implementation of two meandered-line PIFA antennas working as an MIMO system with high isolation for LTE-700 band mobile applications. To solve the problem of mutual coupling, a combination of decoupling arrangements was used to improve the isolation between the two antennas. The influences of various design parameters are investigated using the CST Microwave Studio Suite. A prototype of the proposed Meandered-line PIFA Antenna was fabricated and tested using vector network analyzer. Good agreement was found between the simulated and measured results. The fabricated MIMO antenna shows an isolation better than 12 dB and a -6 dB bandwidth of (75 MHz) in the frequency range from (720 MHz) to (795MHz). The antenna has 1.94 dB gain, total efficiency of 85%, and volume of 110 x 65 x 1.6 mm³, that is (0.275 x 0.1625 x 0.004) in wavelengths.

1. Ali-Yahiya, T., Understanding LTE and Its Performance, Springer Science+Business Media, LLC, 2011.
doi:10.1007/978-1-4419-6457-1

2. White paper, LTE, "The future of mobile broadband technology,", Verizon Wireless, 2009.

3. Plevel, S., et al. "MIMO: Wireless communications," Encyclopedia of Wireless and Mobile Communications, Taylor & Francis, 2008.

4. Loutridis, A., M. John, and M. J. Ammann, "Dual band LTE planar inverted-F antenna for M2M applications," Microwave and Optical Technology Letters, Vol. 55, No. 12, 2925-2929, 2013.
doi:10.1002/mop.27980

5. Kearney, D., M. John, and M. J. Ammann, "Miniature ceramic PIFA for UWB band group 3 & 6," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 28-31, Jan. 2010.
doi:10.1109/LAWP.2010.2041423

6. Zhang, S., et al. "Mutual coupling reduction of two PIFAs with a T-shape slot impedance transformer for MIMO mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 60, 1521-1531, 2012.
doi:10.1109/TAP.2011.2180329

7. Singh, H. S., B. R. Meruva, G. K. Pandey, P. K. Bharti, and M. K. Meshram, "Low mutual coupling between MIMO antennas by using two folded shorting strips," Progress In Electromagnetics Research B, Vol. 53, 205-221, 2013.
doi:10.2528/PIERB13052305

8. Zuo, S., Y.-Z. Yin, W.-J. Wu, Z.-Y. Zhang, and J. Ma, "Investigations of reduction of mutual coupling between two planar monopoles using two λ/4 slots," Progress In Electromagnetics Research Letters, Vol. 19, 9-18, 2010.
doi:10.2528/PIERL10100609

9. Li, J. F., Q. X. Chu, and T. G. Huang, "A compact wideband MIMO antenna with two novel bent slits," IEEE Transactions on Antennas and Propagation, Vol. 60, 482-489, 2012.
doi:10.1109/TAP.2011.2173452

10. Marzudi, W. N. N. W., et al. "Mutual coupling reduction of two elements antenna for wireless applications," Proceeding: 2nd International Conference on Technological Advances in Electrical, Electronics and Computer Engineering (TAEECE2014), Kuala Lumpur, Malaysia, Mar. 2014.

11. Su, S. W., C. T. Lee, and F. S. Chang, "Printed MIMO antenna system using neutralization-line technique for wireless USB-Dongle applications," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 2, Feb. 2012.
doi:10.1109/TAP.2011.2173450

12. Baek, J. and J. Choi, "The design of an LTE/MIMO antenna with high isolation using a decoupling network," Microwave and Optical Technology Letters, Vol. 56, No. 9, 2187-2191, Sep. 2014.
doi:10.1002/mop.28551

13. Chou, J., et al. "A novel LTE MIMO antenna with decoupling element for mobile phone application," EMC’14 Conference, 697-700, Tokyo, May 2014.

14. Kumar, V. and A. Pawaria, "A compact two element UWB MIMO antenna," International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering, Vol. 3, No. 5, May 2015.

15. Naser, A. A., K. H. Sayidmarie, and J. S. Aziz, "A meandered line-PIFA antenna for LTE (Band- Class-13) handset applications," Loughborough Antennas & Propagation Conference (LAPC), Nov. 2015.

16. Park, G., et al. "The compact quad-band mobile handset antenna for the LTE700 MIMO Application," IEEE APSURSI’09, 1-4, Jun. 1–5, 2009.

17. Lee, J., et al. "Miniature Long-Term Evolution (LTE) MIMO ferrite antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 603-606, 2011.

18. Zhao, X., Y. Lee, and J. Choi, "Design of a compact planar MIMO antenna for LTE mobile application," Proceedings of ISAP2012, Nagoya, Japan, 2012.

19. Meshram, M. K., et al. "A novel quad-band diversity antenna for LTE and Wi-Fi applications with high isolation," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 9, Sep. 2012.
doi:10.1109/TAP.2012.2207044

20. Zhao, X., Y. Lee, and J. Choi, "Design of a compact MIMO antenna using coupled feed for LTE mobile applications," International Journal of Antennas and Propagation, Vol. 2013, 8 pages, Article ID 837643, 2013.

21. Mun, B., et al. "New configuration of handset MIMO antenna for LTE700 band applications," International Journal of Antennas and Propagation, Vol. 2013, 6 pages, Article ID 850489, 2013.

22. Sun, Q., et al. "Broadband two-element array with hybrid decoupling structures for multimode mobile terminals," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 2015.

23. Singh, H. S., G. K. Pandey, P. K. Bharti, and M. K. Meshram, "Compact printed diversity antenna for LTE700/GSM1700/1800/UMTS/Wi-Fi/Bluetooth/LTE2300/2500 applications for slim mobile handsets," Progress In Electromagnetics Research C, Vol. 56, 83-91, 2015.
doi:10.2528/PIERC14122601

Dr. Ahmed A. Naser

Prof. Khalil Sayidmarie

Dr. Jabir S. Aziz