Equivalent Edge Currents for Modified Edge Representation of Flat Plates: Fringe Wave Components

Tsutomu MURASAKI  Masahide SATO  Yoshio INASAWA  Makoto ANDO  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.9   pp.1412-1419
Publication Date: 1993/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Theory
high frequency approximation,  method of equivalent edge currents,  GTD,  UTD,  PTD,  

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A novel approximate equivalent edge currents (EECs) are proposed for use in the modified edge representation (MER) for flat plates. It was reported that PO-EECs with classical PO diffraction coefficients, as applied to MER, perfectly recover PO surface integration. The inclusion of classical FW-EECs as it is, however, would not enhance the accuracy since the reality of the fringe wave is lost in the edge modification. This paper presents simple approximation for inclusion of FW-EECs in MER; FW-EECs are weighted by the function of the angle between the modified edge and the real edge. The key feature of this approach is that uniform fields are predicted everywhere though only classical diffraction coefficients are used. MER also simplifies the ray-tracing in the secondary diffraction analysis. Numerical results for diffraction from flat plates demonstrate the potential of these EECs.