volume | PIER Journals

Abstract

In this paper, a tunable multiband LTE antenna is designed for metal-rimmed smartphone applications. The antenna only uses a broken metal ring, which comprises an IFA (Inverted-F antenna) section and a parasitic section, and generates three resonant modes through this layout for the feeding point and shorting point. In addition, loading a matching circuit at the feeding point and a RF switch at shorting point of the IFA is used to switch low frequency to lower frequency. The bandwidth can completely cover 824-960 and 1710-2690 MHz. So the proposed antenna can work at GSM850, 900; DCS1800; PCS1900; WCDMA band 1, 2, 4, 5, 8; TD-SCDMA band 34, 39; CDMA BC0,BC1 and LTE band 1, 3, 7, 38, 39, 40, 41. Also, the total size of the cellphone is 150 mm×75 mm×3.5 mm, which is very suitable for 4G slim smart mobile phone applications.

1. Wong, K. L., Planar Antennas for Wireless Communications, Wiley, New York, 2003.

2. Lin, C. C., G. Y. Lee, and K. L. Wong, "Surface-mount dual-loop antenna for 2.4/5 GHz WLAN operation," Electronics Letters, Vol. 39, 1302-1304, 2003.
doi:10.1049/el:20030845

3. Chen, W. S. and K. Y. Ku, "Broadband design of a small nonsymmetrical ground λ/4 open slot antenna," Microwave Journal, Vol. 50, 110-120, 2007.

4. Guo, Q. X., "Interaction between internal antenna and external antenna of mobile phone and hand effect," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 2, 862-870, Feb. 2013.
doi:10.1109/TAP.2012.2220323

5. Yuan, B., et al. "Slot antenna for metal-rimmed mobile handsets," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 1334-1337, 2012.
doi:10.1109/LAWP.2012.2227663

6. Ilvonen, R. J. and C. Icheln, "Inherently non-resonant multi-band mobile terminal antenna," Electronics Letters, Vol. 49, 11-13, 2013.

7. Wong, K. L., Y. W. Chang, and S. C. Chen, "Bandwidth enhancement of small-size planar tablet computer antenna using a parallel-resonant spiral slit," IEEE Transactions on Antennas and Propagation, Vol. 60, 1705-1711, 2012.
doi:10.1109/TAP.2012.2186266

8. Wong, K. L., P. W. Lin, and H. J. Hsu, "Decoupled WWAN/LTE antennas with an isolation ring strip embedded therebetween for smartphone application," Microwave and Optical Technology Letters, Vol. 55, 1470-1476, 2013.
doi:10.1002/mop.27654

9. Valkonen, R., M. Kaltiokallio, and C. Icheln, "Capacitive coupling element antennas for multi-standard mobile handsets," IEEE Transactions on Antennas and Propagation, Vol. 61, 2783-2791, 2013.
doi:10.1109/TAP.2013.2244838

10. Wahid, P. F., M. A. Ali, B. C. DeLoach, and Jr., "A reconfigurable Yagi antenna for wireless communications," Microwave and Optical Technology Letters, Vol. 38, 140-141, 2003.
doi:10.1002/mop.10997

11. Zhou, L., S. K. Sharma, and S. K. Kassegne, "Reconfigurable microstrip rectangular loop antennas using RF MEMS switches," Microwave and Optical Technology Letters, Vol. 50, 252-256, 2008.
doi:10.1002/mop.23042

12. Al-Dahleh, R., C. Shafai, and L. Shafai, "Frequency-agile microstrip patch antenna using a reconfigurable mems ground plane," Microwave and Optical Technology Letters, Vol. 43, 64-67, 2004.
doi:10.1002/mop.20376

Dr. Xiao-Yan Zhang

Mr. Xinxing Zhong

Dr. Chuanyun Wang

Dr. Zhiwei Liu