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|Title:||Radio wave propagation along mixed paths through a four-layered model of rain forest: an analytic approach|
|Authors:||Li, L.-W. |
|Citation:||Li, L.-W., Yeo, T.-S., Kooi, P.-S., Leong, M.-S. (1998-07). Radio wave propagation along mixed paths through a four-layered model of rain forest: an analytic approach. IEEE Transactions on Antennas and Propagation 46 (7) : 1098-1111. ScholarBank@NUS Repository.|
|Abstract:||This paper presents a novel full-wave analysis of the radio waves that are excited from a dipole antenna located in the trunk layer and propagate inside a four-layered forest medium. The dyadic Green's functions for the four-layered geometry are applied first to derive the integral expression of the electric fields. The closed form of the electric fields is then obtained by using the quasi-static approximation, saddle-point technique, and branch-cut integrations in the complex plane and, hence, expressed in terms of direct waves, multiple reflected waves, and lateral waves. Two kinds of images, i.e., the quasi-dynamic and complex images, are considered in the integration in the complex plane. Among those waves excited by a dipole antenna in the four-layered medium, it is shown theoretically and numerically that the lateral wave along the upper-side air-canopy interface plays a role of dominant modes. Propagation mechanism of other lateral waves due to the air-canopy, canopy-trunk, and trunk-ground interfaces is also discussed and analyzed so as to gain an insight into the wave characteristics. Transmission losses of the lateral waves are calculated numerically.|
|Source Title:||IEEE Transactions on Antennas and Propagation|
|Appears in Collections:||Staff Publications|
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