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We have shown that a perfectly conducting wire has an equivalent radius, a0 = 0.135 Deltar (Deltar is the lateral side length of rectangular cells used), if the tangential components of electric field along the wire axis are forced to zero in finite-difference time-domain (FDTD) calculations in the 2-D cylindrical coordinate system. Further, we have shown that the technique proposed by Noda and Yokoyama...
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