Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 99 > pp. 149-161


By Y. S. Meng, Y. H. Lee, and B. C. Ng

Full Article PDF (334 KB)

In this paper, rainfall effect on the VHF radio-wave propagation in a tropical forest is further studied in details. Theoretical study and experimental investigations are performed with the help of a four-layered model for forested environment. It is found that the lateral wave traveling along the air-canopy interface, the direct waves, and the ground reflected waves are the main modes for VHF radio-wave propagation in forest. The rainfall can affect these propagating waves to different extents. Especially, due to the increase in the dielectric permittivity of the wet canopy layer by rain water, the time of arrival of the direct wave traveling through the canopy layer can be delayed significantly. Finally, the dielectric permittivity for the wet canopy layer under different rain events is evaluated empirically.

Y. S. Meng, Y. H. Lee, and B. C. Ng, "Further study of rainfall effect on VHF forested radio-wave propagation with four-layered model," Progress In Electromagnetics Research, Vol. 99, 149-161, 2009.

1. Tamir, T., "On radiowave propagation in forest environments," IEEE Trans. Antennas Propag., Vol. 15, No. 6, 806-817, 1967.

2. Dence, D. and T. Tamir, "Radio loss of lateral waves in forest environments," Radio Sci., Vol. 4, No. 4, 307-318, 1969.

3. Tamir, T., "Radio waves propagation along mixed paths in forest environments," IEEE Trans. Antennas Propag., Vol. 25, No. 4, 471-477, 1977.

4. Cavalcante, G. P. S., D. A. Rogers, and A. J. Giardola, "Radio loss in forests using a model with four layered media," Radio Sci., Vol. 18, No. 5, 691-695, 1983.

5. Seker, S. S. and A. Schneider, "Stochastic model for pulsed radio transmission through stratified forests," IEE Proc. Microw. Antennas Propag., Vol. 134, No. 4, 361-368, 1987.

6. Li, L. W., T. S. Yeo, P. S. Kooi, M. S. Leong, and J. H. Koh, "Analysis of electromagnetic wave propagation in forest environment along multiple paths," Journal of Electromagnetic Waves and Applications, Vol. 13, No. 8, 1057-1059, 1999.

7. Li, L. W., J. H. Koh, T. S. Yeo, M. S. Leong, and P. S. Kooi, "Analysis of radiowave propagation in a four-layered anisotropic forest environment," IEEE Trans. Geosci. Remote Sensing, Vol. 37, No. 4, 1967-1979, 1999.

8. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Study of propagation loss prediction in forest environment," Progress In Electromagnetics Research B, Vol. 17, 117-133, 2009.

9. ITU-R P.530-12, "Propagation data and prediction methods required for the design of terrestrial line-of-sight systems,", Jan. 2007.

10. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Investigation of rainfall effect on forested radio wave propagation," IEEE Antennas Wireless Propag. Lett., Vol. 7, 159-162, 2008.

11. Meng, Y. S., Y. H. Lee, and B. C. Ng, "The effects of tropical weather on radio wave propagation over foliage channel," IEEE Trans. Veh. Technol., Vol. 58, No. 8, 4023-4030, 2009.

12. Sarabandi, K. and I. S. Koh, "Effect of canopy-air interface roughness on HF-VHF wave propagation in forest," IEEE Trans. Antennas Propag., Vol. 50, No. 2, 111-121, 2002.

13. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Empirical near ground path loss modeling in a forest at VHF and UHF bands," IEEE Trans. Antennas Propag., Vol. 57, No. 5, 1461-1468, 2009.

14. Schuster, U. G. and H. Bolcskei, "Ultrawideband channel modeling on the basis of information-theoretic criteria," IEEE Trans. Wireless Commun., Vol. 6, 2464-2475, 2007.

15. Meng, Y. S., Y. H. Lee, and B. C. Ng, Statistical modeling of rainfall effect on a foliage propagation path, Proc. IEEE APS Int. Symp. Antennas Propag., Charleston, South Carolina, Jun. 2009.

16. Li, Y. and H. Ling, "Numerical modeling and mechanism analysis of VHF wave propagation in forested environments using the equivalent slab model," Progress In Electromagnetics Research, Vol. 91, 17-34, 2009.

© Copyright 2014 EMW Publishing. All Rights Reserved