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Volume 21 Issue 3
May  1999
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Li Qingliang, Ge Debiao. AN FDTD NEAR TO FAR ZONE TRANSFORMATION FOR GROUND WAVE SCATTERING FROM OBJECTS ABOVE A FLAT EARTH[J]. Journal of Electronics & Information Technology, 1999, 21(3): 428-432.
Citation: Li Qingliang, Ge Debiao. AN FDTD NEAR TO FAR ZONE TRANSFORMATION FOR GROUND WAVE SCATTERING FROM OBJECTS ABOVE A FLAT EARTH[J]. Journal of Electronics & Information Technology, 1999, 21(3): 428-432.

AN FDTD NEAR TO FAR ZONE TRANSFORMATION FOR GROUND WAVE SCATTERING FROM OBJECTS ABOVE A FLAT EARTH

  • Received Date: 1997-09-23
  • Rev Recd Date: 1998-07-17
  • Publish Date: 1999-05-19
  • A scheme of FDTD near to far zone transformation for ground wave scattering from objects above a flat earth is presented in this paper. With the equivalent principle, the equivalent electric and magnetic currents can be obtained from FDTD near field output boundaries. The fields radiated by these currents in the presence of a flat earth are then calculated using the reciprocity theorem and the known lateral wave formula of a vertical dipole(King, et al. 1992). Numerical results show excellent agreement between this scheme and analytical method. The feasibility of another approximation approach (Q.L.Li, et al. 1997) is also tested by this scheme.
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  • Li Qingliang, Ge Debiao, et al. Ground wave scattering from a ship on the sea. Proc. of 97 Int. Symp. on Radio Popagat., Qingdao, China, Aug. 1997, 134-136.[2]King R W P, Owens M, Wu T T. Lateral Electromagnetic Wave. New York: Springer-verlay, 1992,51-86.[3]Wong P B, Tyler G L, Baron J E, Simpson R A. A three-wave FDTD approach to surface scattering with application to remote sensing of geophysical surface. IEEE Trans. on Antennas and Propagt., 1996, AP-44(4): 504-514.[4]Demarest K, Huang Z B, Plumb R. An FDTD near-to far-zone transformation for scatterers buried in stratified ground. IEEE Trans. on Antennas and Propagt., 1996, AP-44(8): 1150-1157.[5]Harrington R F. Time-Harmonic Electromagnetic Fields. New York: McGraw-Hill, 1961, Chapter 3.[6]吴良超,汪茂光.复宗量菲涅尔函数的计算及其性质.电子科学学刊,1996, 16(6): 614-621.[7]Yee K S. Numerical solution of initial boundary value problems involving Maxwells equations in isotropic media. IEEE Trans. on Antennas and Propagt., 1966, AP-14(5): 302-306.
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