Journal Article10.1049/IP-H-2.1989.0002
Radio pulse transmission along mixed paths in a stratified forest
S. Selim Seker
- 01 Feb 1989
- Vol. 136, Iss: 1, pp 13-18
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TL;DR: In this paper, a stochastic radiowave propagation model for radio pulse transmission along mixed paths in a stratified forest is proposed, which considers the forest as a planar stratified, anisotropic and discrete random medium which is bounded above by air and below by ground.
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Abstract: Radio pulse transmission is studied along mixed paths in a stratified forest using a stochastic radiowave propagation model. The model considers the forest as a planar stratified, anisotropic and discrete random medium which is bounded above by air and below by the ground. It consists of randomly positioned and oriented canonical scatterers which represent the principal forest constituents. Analytical results are found for sample canonical geometries in which the fields can be described in terms of ray trajectories for different propagation paths. These are then used for the numerical application of the model.
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Citations
Radio wave propagation through vegetation: Factors influencing signal attenuation
TL;DR: In this article, an extensive wideband channel sounding measurement campaign to investigate signal propagation through vegetation is described, where measurements have been conducted at three frequencies (1.3, 2 and 11.6 GHz) at sites with different measurement geometries and tree species.
86
Radio wave propagation along mixed paths through a four-layered model of rain forest: an analytic approach
TL;DR: In this article, the dyadic Green's functions for the four-layered geometry are applied first to derive the integral expression of the electric fields, and closed form of electric fields are obtained by using the quasi-static approximation, saddle-point technique, and branch-cut integrations in the complex plane and expressed in terms of direct waves, multiple reflected waves, and lateral waves.
65
Effect of canopy-air interface roughness on HF-VHF wave propagation in forest
Kamal Sarabandi,Il-Suek Koh +1 more
TL;DR: In this paper, the effect of the nonplanar interface between the air and the canopy, which has been ignored in previous models, is examined and an analytical formulation is obtained for the mean field when both the transmitter and the receiver are within the foliage.
57
Analysis of radiowave propagation in a four-layered anisotropic forest environment
TL;DR: It is found that the lateral wave plays a major role in communication at large distances in the propagation of electromagnetic waves in forest environments in which both the transmitting and receiving points are located in the trunk layer of a four-layered anisotropic forest model.
45
Empirical Study of Near Ground Propagation in Forest Terrain for Internet-of-Things Type Device-to-Device Communication
TL;DR: Continuous-wave power measurements conducted in forest terrain with a focus on path-loss in a device-to-device (D2D) communication scenario show that the dominant path of propagation is through the foliage for the first approximately 1000 m, resulting in foliage excess loss being the dominant loss mechanism in this region.
References
Electromagnetic fields due to dipole antennas over stratified anisotropic media.
TL;DR: In this article, a general wave field is decomposed into transverse magnetic (TM) and transverse electric (TE) modes and the reflection coefficients are obtained in closed form.
179
Radio wave propagation along mixed paths in forest environments
TL;DR: The propagation of radio waves is examined for communication paths that may be partly within a forest and partly in regions outside the vegetation, and ray-tracking approaches are used to evaluate radio losses in complex situations.
127
Electromagnetic fields of buried sources in stratified anisotropic media
S. Ali,S. Mahmoud +1 more
TL;DR: In this paper, a general formulation to the problem of the radiation of arbitrary distribution of buried sources within a horizontally stratified anisotropic medium is presented, where the fields are obtained in terms of appropriately defined electric and magnetic types of dyadic Green's functions which are dual to each other.
69
A Conducting-Slab Model for Electromagnetic Propagation Within A Jungle Medium
David L. Sachs,Philip J. Wyatt +1 more
TL;DR: In this article, a theoretical determination of the path loss in radio propagation through a Thailand jungle is obtained by considering the jungle as a homogeneous conducting dielectric slab on a flat earth, and an exact integral is obtained for the vertical component of the electric field within the jungle due to a vertical electric dipole.
51
Analysis of electromagnetic wave propagation in multilayered media using dyadic Green's functions
TL;DR: In this paper, the propagation of electromagnetic waves in media with various horizontal layers has been analyzed and the electromagnetic fields outside the source region were obtained from the dyadic Green's functions for the case of media with three and four layers.
49