volume | PIER Journals

Abstract

A small-size ultra-thin and narrow frame antenna with a switchable matching network to achieve LTE dual-wide band operation in the 700-980 and 1710-2500 MHz bands is presented for mobile phone applications. The highlight of the antenna is that it has a low profile of only 2 mm and occupies a small ground clearance of 45 × 4.5 mm², which are very attractive for ultra-thin mobile antenna applications. A folded monopole is used as a radiator fed via a switchable two-state matching circuit controlled by a PIN diode. The PIN type switchable matching network is mainly designed to tune the low band (700-980 MHz). By combining the two working states of the PIN diode, the proposed antenna can cover GSM850/GSM900/DCS1800/PCS1900/UMTS2100 and two LTE bands, LTE700/LTE2300. Details of the antenna are described in this study.

1. Ban, Y. L., J. H. Chen, S. Yang, J. L. W. Li, and Y. J. Wu, "Low-profile printed octa-band LTE/WWAN mobile phone antenna using embedded parallel resonant structure," IEEE Trans. Antennas Propag., Vol. 61, No. 7, 3889-3894, 2013.
doi:10.1109/TAP.2013.2258879

2. Ban, Y. L., Y. F. Qiang, Z. Chen, K. Kang, and J. L. W. Li, "Low-profile narrow-frame antenna for seven-band WWAN/LTE smartphone applications," IEEE Antennas Wireless Propag. Lett., Vol. 13, 463-466, 2014.

3. Zheng, M., H. Wang, and Y. Hao, "Internal hexa-band folded monopole/dipole/loop antenna with four resonances for mobile device," IEEE Trans. Antennas Propag., Vol. 60, No. 6, 2880-2885, 2012.
doi:10.1109/TAP.2012.2194687

4. Wu, D., S. W. Cheung, and T. I. Yuk, "A compact and low-profile loop antenna with multiband operation for ultra-thin smartphones," IEEE Trans. Antennas Propag., Vol. 63, No. 1, 2745-2750, 2015.
doi:10.1109/TAP.2015.2412962

5. Ban, Y. L., Z. X. Chen, Z. Chen, K. Kang, and J. L. W. Li, "Reconfigurable narrow-frame Antenna for heptaband WWAN/LTE smartphone applications," IEEE Antennas Wireless Propag. Lett., Vol. 13, 1365-1368, 2014.

6. Li, Y., Z. Zhang, W. Chen, Z. Feng, and M. F. Iskander, "A quadband antenna with reconfigurable feedings," IEEE Antennas Wireless Propag. Lett., Vol. 8, 1069-1071, 2009.
doi:10.1109/LAWP.2009.2031415

7. Lee, S. W., H. S. Jung, and Y. J. Sung, "A reconfigurable antenna for LTE/WWAN mobile handset applications," IEEE Antennas Wireless Propag. Lett., Vol. 14, 48-51, 2015.
doi:10.1109/LAWP.2014.2354834

8. Li, Y., Z. Zhang, J. Zheng, Z. Feng, and M. F. Iskander, "A compact hepta-band loop-inverted F reconfigurable antenna for mobile phone," IEEE Trans. Antennas Propag., Vol. 60, No. 1, 389-392, 2012.
doi:10.1109/TAP.2011.2167949

9. Lee, S. W. and Y. Sung, "Compact frequency reconfigurable antenna for LTE/WWAN mobile handset applications," IEEE Trans. Antennas Propag., Vol. 63, No. 10, 4572-4577, 2015.
doi:10.1109/TAP.2015.2456940

10. Choi, M., H. Wi, B. Mun, et al. "A compact frequency reconfigurable antenna for LTE mobile handset applications," International Journal of Antennas & Propagation, 2015.
doi:10.1109/TAP.2015.2456940

11. Li, Y., Z. Zhang, W. Chen, Z. Feng, and M. F. Iskander, "A switchable matching circuit for compact wideband antenna designs," IEEE Trans. Antennas Propag., Vol. 58, No. 11, 3450-3457, 2010.
doi:10.1109/TAP.2010.2071345

12. Yang, C. W., Y. B. Jung, and C. W. Jung, "Octaband internal antenna for 4G mobile handset," IEEE Antennas Wireless Propag. Lett., Vol. 10, 817-819, 2011.
doi:10.1109/LAWP.2011.2164049

13. Chu, F. H. and K. L. Wong, "Internal coupled-fed dual-loop antenna integrated with a USB connector for WWAN/LTE mobile handset," IEEE Trans. Antennas Propag., Vol. 59, No. 11, 4215-4221, 2011.
doi:10.1109/TAP.2011.2164220

14. Ban, Y. L., J. H. Chen, J. L. W. Li, and Y. Wu, "Small-size printed coupled-fed antenna for eightband LTE/GSM/UMTS wireless wide area network operation in an internal mobile handset," Microw., Antennas Propag., Vol. 7, No. 6, 399-407, 2013.
doi:10.1049/iet-map.2012.0390

Dr. Hao Wang

Dr. Zheqiang Wu

Dr. Yibo Wang

Prof. Chow-Yen-Desmond Sim

Professor Guangli Yang