Title :
Numerical modeling of a spherical array of monopoles using FDTD method
Author :
Franek, Ondrej ; Pedersen, Gert F. ; Andersen, J. Bach
Author_Institution :
Inst. of Radio Electron., Brno Univ. of Tech, Czech Republic
fDate :
7/1/2006 12:00:00 AM
Abstract :
In this paper, the spherical-coordinate finite-difference time-domain method is applied to numerical analysis of phased array of monopoles distributed over a sphere. Outer boundary of the given problem is modeled by accurate spherical-coordinate anisotropic perfectly matched layer. The problem of increased cell aspect ratio near the sphere poles causing degradation of results is solved by dispersion optimization through artificial anisotropy. The accuracy of the approach is verified by comparing a model case with an exact solution. Finally, radiation patterns obtained by frequency-domain near-to-far-field transform and s-parameters of the array elements are presented and validated by comparing with measurement data.
Keywords :
S-parameters; anisotropic media; antenna phased arrays; antenna radiation patterns; antenna theory; finite difference time-domain analysis; monopole antenna arrays; FDTD; S-parameter; array element; artificial anisotropy; dispersion optimization; finite-difference time-domain method; numerical analysis; phased monopole array; radiation pattern; spherical-coordinate perfectly matched layer; Anisotropic magnetoresistance; Degradation; Finite difference methods; Frequency measurement; Numerical analysis; Numerical models; Perfectly matched layers; Phased arrays; Scattering parameters; Time domain analysis; Antenna arrays; finite-difference time-domain (FDTD) methods; spherical antennas; spherical coordinates; ultrawideband technology;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2006.877202