%0 Conference Paper
%B International Symposium on Antennas, Propagation and EM Theory
%D 2000
%T Numerical Diffraction Coefficients of the Irregular Top on a Conductive Cone a GMT/PO Approach
%A X. L. Bao
%A W. X. Zhang
%A Y. M. Bo
%X In the electromagnetic scattering problem, the total scattering field of electrically large objects with complex geometry may be considered as a summation of the physical optics (PO) from all smooth sub-surfaces and the additional diffracted contribution from the discontinuous junction between those sub-surfaces. In order to calculate the results exactly the diffraction coefficients are the key, but only several canonical scatterers, such as the wedge, have an asymptotic expression of the diffraction coefficients. So, the numerical diffraction coefficients (NDC) of most scatters must be studied. Some 2-D NDC had been reported, and a hybrid method of the generalized multi-pole technique and physical optics (GMT/PO) was developed for extracting the 2-D and then 3-D NDC of an irregular conductive wedge. In this paper, the GMT/PO hybrid method accompanied with the iteration technique is extended to extract 3-D NDC from irregular top of the semi-infinite conductive cone. The computed backward radar cross sections (RCS) of a finite cone with a regular top are in good agreement with the results obtained by the geometrical diffraction method (GTD).
%B International Symposium on Antennas, Propagation and EM Theory
%I Institute of Electronic & Electrical Engineers
%C Beijing, China
%P 496 - 499
%8 15/08/2000
%U http://ieeexplore.ieee.org/iel5/7185/19345/00894831.pdf
%R 10.1109/ISAPE.2000.894831
%0 Conference Paper
%B International Symposium on Antennas, Propagation and EM Theory
%D 2000
%T Numerical Diffraction Coefficients of the Irregular Top on a Semi-Infinite Conductive Circular-Cylinder a GMT/PO Approach
%A X. L. Bao
%A W. X. Zhang
%A Y. M. Bo
%X In the problem of the electromagnetic scattering, the conductive surface of electrically large objects with complex geometry can be divided into a number of sub-surfaces with simple shape far each. The total scattering field may be considered as summation of the physical optics (PO) from all sub-surfaces, but the additional diffracted contribution from the discontinuous junction between those sub-surfaces must be taken into account. Besides the asymptotic expression of diffraction coefficients had been derived for the regular edge of canonical scatterer, only the numerical diffraction coefficients (NDC) can be employed. A hybrid method of the generalized multi-pole technique and physical optics (GMT/PO) was developed previously for extracting the NDC of an irregular conductive wedge. In this paper, the GMT/PO hybrid method accompanied with an iteration technique is extended to extract 3-D NDC from an an irregular edge between the terminal cross-section and the circularly cylindrical surface of a semi-infinite conductive scatterer. The computed RCS (backward NDC) of a finite circular-cylinder with regular edge are in good agreement with the measured data.
%B International Symposium on Antennas, Propagation and EM Theory
%I Institute of Electronic & Electrical Engineers
%C Beijing, China
%P 500-503
%8 15/08/2000
%U http://ieeexplore.ieee.org/iel5/7185/19345/00894832.pdf?tp=&isnumber=**19345**&arnumber=894832&punumber=7185
%R 10.1109/ISAPE.2000.894832