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Author: search.filters.author.Pimpatang, AwikaHas files: No

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    Heuristic UTD solution for antennas near a complex platform
    (2019-01-01)
    Pimpatang, Awika
    ;
    Lertwiriyaprapa, Titipong
    ;
    Phongcharoenpanich, Chuwong
    This paper is aimed at developing an approximate and relatively simple but closed-form uniform geometrical theory of diffraction (UTD) solution for describing the radiated and scattered fields by an antenna near a complex platform consisting of a three-dimensional (3-D) thin material-coated metallic surface, including edges and corners. Unlike the previous works that consider primarily plane wave scattering, the developed solution can also treat radiation/scattering problems of antennas near finite material-coated metallic surfaces which are composed of edges and corners. The developed solution, which is formulated by using a heuristic approach, recovers the proper local plane wave Fresnel reflection coefficient. In addition, the developed UTD-diffracted fields will satisfy the radiation condition, boundary conditions on the conductor. The accuracy of the developed solution is verified by comparing with simulation results from a computer software. It is found that the results from our developed solution agree well with those of references. However, some small discrepancies occur but it is good enough for engineering applications. The proposed solution can be very useful for antenna engineers to design multiple antennas with an electrically large complex material-coated platform.
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    Heuristic UTD corner and slope diffractions for antenna problem
    (2017-12-19)
    Pimpatang, Awika
    ;
    Lertwiriyaprapa, Titipong
    ;
    Pongcharoenpanich, Chuwong
    This paper presents a heuristic UTD corner diffraction for an antenna problem. The proposed heuristic UTD corner diffraction coefficient and slope diffraction are developed from the original UTD solution. This proposed solution can deal with a finite size perfect electric conductor (PEC) configuration including edges and corners for any antenna problem. A half wavelength dipole above a square PEC patch is used to be a case study in the paper. It is found that the numerical result from the proposed UTD agrees well with the simulation result from CST computer software. However, there are some discrepancies discontinuity at 90 degrees. It is in progress work to fix this problem.