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This paper presents the design of low-cost planar near-field to far-field measurement system for a small antenna and small scattering objects. This work is proposed to accurately and precisely measure the electromagnetic (EM) wave scattered from a small object. The minimum scanning resolution of the proposed system is 0.5 cm per step in horizontal and vertical directions. In order to design the proposed...
This paper presents an accuracy of a modified UTD solution for a convex impedance cylinder based on the general 3D UTD solution for a smooth convex perfectly electric conductor (PEC) scattering problem. By employing the impedance boundary condition (IBC), the modified UTD solution for a convex impedance cylinder can be used for the material-coated PEC cylinder problem. Thus, the modified UTD solution...
This paper presents a modified uniform theory of diffraction (UTD) solution in 3D case for computing the electromagnetic (EM) field scattering from the impedance cylinder surface. The proposed solution based on the general 3D UTD solution for a smooth convex perfect electric conductor (PEC) scattering problem. Here, the Pekeris-integral function in the 3D UTD PEC solution is modified by using the...
The radio wave propagation model is theoretically proposed in this paper, by using the uniform geometrical theory of diffraction (UTD) together with the Gaussian beam (GB) via the complex source point (CSP) technique. The path loss and multipath propagation are predicted in a Thai commercial orchard. The durian orchard is primarily chosen to be an example for this study but the radio wave propagation...
An analysis of the path loss in the durian orchard is presented by using the complex source point technique (CSP) and the uniform geometrical theory of diffraction (UTD). The 2D Gaussian beams (GBs) expansion scattered by 2D cylindrical structures are presented. The GB can be generated by using the CSP. The GBs expansion can provides an efficient way of the synthesis of the radiation pattern of the...
The analysis of path loss in scattering zone by using UTD is presented. The results of the total field results from the UTD solution agree very well with that from NEC-BSC. Around the vicinity of the source, the UTD results agree with experimental results but not in the further region. This is due to the fact that the line-of-sight and reflected field components are very strong in this region. For...
The path loss measurements and modeling in durian orchard for wireless network at 5.8 GHz are presented. The path loss model is important to predict and design the wireless communication system in the durian orchard. The transmitter is set up near the bole of a durian tree and received the signal strength by spectrum analyzer. The communication channel is connected between the communication nodes...
The development of asymptotic high-frequency, uniform geometrical theory of diffraction (UTD) solutions, which will identify and quantify all the pertinent ray mechanisms for predicting, in a relatively simple closed form, the high frequency radiation characteristics of practical, planar, metamaterial (MTM) antenna structures is presented in this paper. In particular, the present analytical UTD development...
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