volume | PIER Journals

Abstract

Spatial focusing characteristics of time reversal (TR) electromagnetic waves are studied in this paper. Different antenna arrays are used as a TR mirror and their elements are arranged in one and two dimensions in the horizontal plane. The focused energy density around initial source location is investigated in non-line-ofsight (NLOS) and line-of-sight (LOS) cases, respectively. The results demonstrated that, roughly speaking, under the case of fixed space between two adjacent elements, the more the number of the array elements, the stronger the focused average energy density. However, in the case of fixed TR mirror array aperture, some abnormal phenomena are observed when additional elements are inset into the initial one.

1. Di Benedetto, M.-G. and G. Giancola, Understanding Ultra Wide Band Radio Fundamentals, 2004.

2. Choi, J. D. and W. E. Stark, "Performance of ultrawideband communications with suboptimal receivers in multipath channels," IEEE J. Select. Areas Commun., Vol. 20, No. 9, 1754-1766, Dec. 2002.
doi:10.1109/JSAC.2002.805623 Google Scholar

3. Fan, Z., L. X. Ran, and J. A. Kong, "Source pulse optimizations for UWB radio systems," Journal of Electromagnetic Waves and Applications, Vol. 20, 1535-1550, 2006.
doi:10.1163/156939306779274309 Google Scholar

4. Yang, D., C. Liao, and W. Chen, "Numerical solution on coupling of UWB pulse into a rectangular cavity through slots," Journal of Electromagnetic Waves and Applications, Vol. 19, 1629-1638, 2005.
doi:10.1163/156939305775537375 Google Scholar

5. Klemm, M. and G. Troester, "EM energy absorption in the human body tissues due to UWB antennas," Progress In Electromagnetics Research, Vol. 62, 261-280, 2006.
doi:10.2528/PIER06040601 Google Scholar

6. Kharakhili, F. G., G. Dadashzadeh, M. Fardis, N. Hojjat, and A. A. K. Ahmad, "Rectangular slot with a novel triangle ring microstrip feed for uwb applications," Journal of Electromagnetic Waves and Applications, Vol. 21, 387-396, 2007. Google Scholar

7. Kyritsi, P., G. Papanicolaou, P. Eggers, and A. Oprea, "Time reversal techniques for wireless communications," Proc. 60th IEEE Vehicular Technology Conference, 26-29, 2004.

8. Nguyen, H. T., J. B. Andersen, and G. F. Pedersen, "The potential use of time reversal techniques in multiple element antenna systems," IEEE Communications Letters, Vol. 9, No. 1, 40-42, 2005. Google Scholar

9. Xiao, S., J. Chen, B. Z. Wang, and X. Liu, "A numerical study on time-reversal electromagnetic wave for indoor ultrawideband signal transmission," Progress In Electromagnetics Research, Vol. 63, 329-342, 2007.
doi:10.2528/PIER07082501 Google Scholar

10. Thomas, S., E. Majid, H. Jan, P. George, and A. J. Paulraj, "Application of time-reversal with MMSE equalizer to UWB communications," Proc. 2004 IEEE Global Telecommunications Conference, 3123-3127, 2004.

11. Hung, T. N., Z. K. Istvan, and P. C. F. Eggers, "A time reversal transmission approach for multiuser UWB communications," IEEE Transaction on Antennas and Propagation, Vol. 54, No. 11, 3216-3244, 2006.
doi:10.1109/TAP.2006.883959 Google Scholar

12. Qiu, R. C., C. Zhou, N. Guo, and J. Q. Zhang, "Time reversal with MISO for ultrawide band communication: Experiment results," IEEE Antenna and Wireless Propagation Letters, Vol. 5, 269-273, 2006.
doi:10.1109/LAWP.2006.875888 Google Scholar

13. Lerosey, G., J. D. Rosny, A. Tourin, A. Derode, and M. Fink, "Time reversal of wideband microwave," Applied Physics Letters, Vol. 88, 154101-154103, 2006.
doi:10.1063/1.2194009 Google Scholar

14. Shao, W., B.-Z. Wang, and J. Wang, "Hybrid 2D FDTD method for the analysis of lossy transmission lines," Proceedings of Progress In Electromagnetics Research Symposium, 367 Nanjing, Aug. 2004.

Dr. Shao-Qiu Xiao

Dr. Jian Chen

Dr. Xiao-Fei Liu

Professor Bing-Zhong Wang