volume | PIER Journals

Abstract

A closely-packed (4 mm) diversity slot antennas operating in the UWB frequency is proposed. High isolation (S₂₁ < -20 dB) of two closely-packed slot antennas can be easily achieved in a broad band by taking advantage of the directional radiation characteristics of slot antenna. Quarter-wavelength slot resonator is adopted to improve the isolation in the low-band of the UWB. The simulated current distribution and the radiation patterns of the single antenna element with and without slots are also presented to explain the mechanism of decoupling in the diversity system. Furthermore, the diversity performance of correlation coefficient, mean effective gains (MEGs), diversity gain (DG) are also studied.

1. Foschini, G. J. and M. J. Gans, "On limits of wireless communications in a fading environment when using multiple antennas," Wireless Personal Commun., Vol. 6, 311-335, 1998.
doi:10.1023/A:1008889222784 Google Scholar

2. Bolin, T., A. Derneryd, G. Kristensson, V. Plicanic, and Z. Ying, "Two-antenna receive diversity performance in indoor environment," IEEE Electronic Letters, Vol. 41, 1205-1206, Oct. 2005.
doi:10.1049/el:20053365 Google Scholar

3. Dong, L., H. Choo, R. Heath, Jr., and H. Ling, "Simulation of MIMO channel capacity with antenna polarization diversity," IEEE Trans. Wireless Commun., Vol. 4, No. 4, 1869-1873, Jul. 2005.
doi:10.1109/TWC.2005.850318 Google Scholar

4. Kildal, P. S. and K. Rosengran, "Correlation and capacity of MIMO systems and coupling, radiation efficiency, and diversity gain of their antennas: Simulations and measurements in a reverberation chamber," IEEE Commun. Mag., Vol. 42, No. 12, 102-112, Dec. 2004.
doi:10.1109/MCOM.2004.1367562 Google Scholar

5. Ko, S. C. K. and R. D. Murch, "Compact integrated diversity antenna for wireless communications," IEEE Trans. Antennas Propag., Vol. 49, No. 6, 954-960, Jun. 2001.
doi:10.1109/8.931154 Google Scholar

6. Sturm, C., M. Porebska, E. pancera, and W. Wiesbeck, "Multiple antenna gain in ultra-wideband indoor propagation," The Second European Conference on Antennas and Propagation, 1-4, 2007. Google Scholar

7. Rajagopalan, A., G. Gupta, A. S. Konanur, B. Hughes, and G. Lazzi, "Increasing channel capacity of an altrawideband MIMO system using vector antennas," IEEE Trans. Antennas Propag., Vol. 55, No. 10, 2880-2887, Oct. 2007.
doi:10.1109/TAP.2007.905938 Google Scholar

8. Sturm, C., M, Porebska, J. Timmernann, and W. Wiesbeck, "Investigations on the applicability of diversity techniques in ultraw-ideband radio," International Conference on Electromagnetics in Advanced Applications, 899-902, 2007. Google Scholar

9. Ben, I. M., L. Talbi, M. Nedil, and K. Hettak, "MIMO-UWB channel characterization within an underground mine gallery," IEEE Trans. Antennas Propag., Vol. 60, No. 10, 4866-4874, Apr. 2012.
doi:10.1109/TAP.2012.2207361 Google Scholar

10. Hong, S., K. Chung, J. Lee, S. Jung, S. S. Lee, and J. Choill, "Design of a diversity antenna with stubs for UWB applications," Microwave Optical Tech. Lett., Vol. 50, No. 5, 1352-1356, May 2008.
doi:10.1002/mop.23389 Google Scholar

11. Zhang, S., Z. N. Ying, J. Xiong, and S. L. He, "Ultrawideband MIMO/diversity antennas with a tree-like structure to enhance wideband isolation," IEEE Antennas and Wireless Propag. Lett., Vol. 8, 1279-1282, 2009.
doi:10.1109/LAWP.2009.2037027 Google Scholar

12. Zhu, F. G., J. D. Xu, and Q. Xu, "Reduction of mutual coupling between closely-packed antenna elements using defected ground structure," Electron. Lett., Vol. 45, No. 12, 601-602, Jun. 4, 2009.
doi:10.1049/el.2009.0985 Google Scholar

13. Ding, Y., Z. W. Du, K. Gong, and Z. H. Feng, "A novel dual-band printed diversity antenna for mobile terminals," IEEE Trans. Antennas Propag., Vol. 55, No. 7, 2088-2096, Jul. 2007.
doi:10.1109/TAP.2007.900249 Google Scholar

14. Li, J. F., Q. X. Chu, and T. G. Huan, "A compact wideband MIMO antenna with two novel bent slits," IEEE Trans. Antennas Propag., Vol. 60, No. 2, 482-489, Jul. 2012.
doi:10.1109/TAP.2011.2173452 Google Scholar

15. Chi, G. M., B. H. Li, and D. S. Qi, "Dual-band printed diversity antenna for 2.4/5.2-GHz WLAN application," Microw. Opt. Technol. Lett., Vol. 45, No. 6, 561-563, Jun. 2005.
doi:10.1002/mop.20880 Google Scholar

16. Li, Z. Y., Z. W. Du, and K. Gong, "A dual-slot diversity antenna with isolation enhancement using parasitic elements for mobile handsets," Proc. Asia Pacific Microw. Conf., 1821-1824, 2009. Google Scholar

17. Su, S. W., C. T. Lee, and F. S. Chang, "Printed MIMO-antenna system using neutralization-line technique for wireless USB-dongle applications," IEEE Trans. Antennas Propag., Vol. 60, No. 2, Feb. 2012.
doi:10.1109/TAP.2011.2173450 Google Scholar

18. Antonino-Daviu, E., M. Gallo, B. Bernardo-Clemente, and M. Ferrando-Bataller, "Ultra-wideband slot ring antenna for diversity applications," Electron. Lett., Vol. 46, No. 7, 478-480, 2010.
doi:10.1049/el.2010.0262 Google Scholar

19. Paul, H., "The significance of radiation efficiencies when using S-parameters to calculate the received signal correlation from two antennas," IEEE Ant. Wirel. Propag. Lett., Vol. 4, No. 1, 97-99, Jun. 2005.
doi:10.1109/LAWP.2005.845913 Google Scholar

20. Karaboikis, M. P., V. C. Papamichael, G. F. Tsachtsiris, and V. T. Makios, "Integrating compact printed antennas onto small diversity MIMO terminals," IEEE Trans. Antennas Propag., Vol. 56, No. 7, 2067-2078, Jul. 2008.
doi:10.1109/TAP.2008.924677 Google Scholar

21. Rosengren, K. and P. S. Kildal, "Radiation efficiency, correlation, diversity gain and capacity of a six-monopole antenna array for a MIMO system: Theory, simulation and measurement in reverberation chamber," IEE Proc. Microw. Ant. Propag., Vol. 152, No. 1, 7-16, 2005.
doi:10.1049/ip-map:20045031 Google Scholar

Dr. Chun-Xu Mao

Prof. Qing-Xin Chu

Dr. Yu-Ting Wu

Dr. Ya-Hui Qian