A multiband four-antenna system with high isolation for the mobile phone applications is presented in this paper. The four antennas consisting of a main antenna and three auxiliary antennas are located on a 135×65×0.8 mm3 FR4 epoxy board. The main antenna is an improved monopole antenna which can cover LTE700/2300/2500, GSM850/900/1800/1900/UMTS, and 2.4-GHz WLAN bands. Three identical auxiliary antennas with a size of 40×6×0.8 mm3 are located vertically in the sides and bottom of the circuit board, respectively. By adopting three slots in each radiating patch of the auxiliary antennas, they can successfully cover 704-746 MHz and 1880-2690 MHz band with S11 less than -6 dB. The isolation among the four antennas is better than 13 dB. The measured efficiency of the main antenna in the operation band can reach 40%, and the efficiency of auxiliary antennas can reach 25% at upper frequency band and about 10%-20% at 704-746 MHz band.
2. Wong, K.-L., A.-C. Chen, and Y.-L. Kuo, "Diversity metal-plate planar inverted-F antenna for WLAN operation," Electron. Lett., Vol. 39, 590-591, 2003.
doi:10.1049/el:20030413
3. Chiu, C.-Y., J.-B. Yan, and R. D. Murch, "Compact three-port orthogonally polarized MIMO antennas," IEEE Antennas and Wireless Propag. Lett., Vol. 6, 619-622, 2007.
doi:10.1109/LAWP.2007.913272
4. Wong, K.-L., T.-W. Kang, and M.-F. Tu, "Internal mobile phone antenna array for LTE/WWAN and LTE MIMO operations," Microwave and Opt. Technol. Lett., Vol. 53, 1569-1573, 2011.
doi:10.1002/mop.26038
5. Park, G., M. Kim, T. Yang, J. Byun, and A. S. Kim, "The compact quad-band mobile handset antenna for the LTE700 MIMO application," Proceedings Antennas and Propagation Society International Symposium (APSURSI), 2009.
6. Bhatti, R. A., S. Yi, and S.-O. Park, "Compact antenna array with port decoupling for LTE-standardized mobile phones," IEEE Antennas and Wireless Propag. Lett., Vol. 8, 1430-1433, 2009.
doi:10.1109/LAWP.2010.2040677
7. Chung, H., Y. Jang, and J. Choi, "Design of a multiband internal antenna for mobile application," Proceedings Antennas and Propagation Society International Symposium (APSURSI), 2009.
8. Ding, Y., Z. W. Du, K. Gong, and Z. H. Feng, "A four-element antenna system for mobile phones," IEEE Antennas and Wireless Propag. Lett., Vol. 6, 655-658, 2007.
doi:10.1109/LAWP.2007.913276
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