Thin-wire finite-difference time-domain model for insulated and resistively loaded cylindrical antennas driven by coaxial lines
- Thin-wire finite-difference time-domain model for insulated and resistively loaded cylindrical antennas driven by coaxial lines
- 현승엽; 김세윤; 김영식
- FDTD; antenna; feed
- Issue Date
- IET microwaves, antennas & propagation.
- VOL 3, NO 3, 507-513
- A thin wire-based finite-difference time-domain (FDTD) model for a simple analysis of insulated and
resistively loaded cylindrical antennas fed by coaxial lines is proposed. The resistive loading and the coaxial
feed line are approximated to equivalent resistors along the antenna axis and the equivalent source over the
infinitesimal feed gap, respectively. The effects of the insulation are corrected by employing thin-wire
approximation and the boundary condition. A full coarse-grid FDTD algorithm is then implemented without
additional grid refinements for the insulation, the resistive loading and the feed line. As a function of
insulation properties and resistive loading profiles, the transient reflected feed voltage and the input
impedance of antennas are calculated numerically. The validity of the proposed model is proved by comparing
it with the results of the full fine-grid FDTD.
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