Abstract
The coordinate-based wire model splits the wire into linear segments that are aligned at arbitrary directions within the FDTD grid. Coupling to the intermediate reference surface rather than directly to the Yee grid affords a greater flexibility in wire element position, alignment and length than is the case for the cell-based model. This paper discusses the implementation of conformal wire algorithm within a finite difference code which is used to model free space and cavity-backed spiral wire antennas. The radiation patterns and current distributions were then compared with predictions made by a boundary element, moment method code. Validation against numerical and experimental data suggests that, using conformal wires and conformal surface corrections, the FDTD can be used to model spiral antennas in an accurate manner.
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