Some effects of electric vs. magnetic field Mur absorbing boundaries on FDTD RCS calculations for dielectric and magnetic scatterers

Recent calculations made for magnetic material scatters have shown that the Mur absorbing boundary condition plays a significant role in the RCS (radar cross section) calculation accuracy, and that changing from a Mur condition that operates on electric field to one operating on magnetic field may i...

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Bibliographic Details
Published inAntennas and Propagation Society Symposium 1991 Digest pp. 1764 - 1765 vol.3
Main Authors Steich, D., Luebbers, R., Hunsberger, F., Kunz, K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1991
Subjects
Application software
Boundary conditions
Dielectric losses
Finite difference methods
Magnetic domains
Magnetic fields
Magnetic materials
Radar cross section
Radar scattering
Time domain analysis
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Summary:Recent calculations made for magnetic material scatters have shown that the Mur absorbing boundary condition plays a significant role in the RCS (radar cross section) calculation accuracy, and that changing from a Mur condition that operates on electric field to one operating on magnetic field may improve the accuracy of the RCS results when the composition of the scattering object is changed. To illustrate this, scattering from a 20 cm radius lossy dielectric sphere and then from a sphere composed of the dual magnetic material is considered. By duality the far zone scattering cross sections for the two should be identical. In order for the FDTD (finite-difference-time-domain) results to be exactly dual. the Mur absorbing boundary must be changed from operating on the electric field to operating on the magnetic field. However, changing from electric to magnetic field Mur conditions causes the scattering results to differ by as much is 6 dB.< >
ISBN:0780301447
9780780301443
DOI:10.1109/APS.1991.175200