Application of Shifted Frequency Internal Equivalence to Multifrequency Scattering Problems

In this paper, a simple solution is presented for multifrequency electromagnetic scattering from inhomogeneous bodies. Shifted frequency internal equivalence is used to replace the electromagnetic problem at operating frequency ω by equivalent volume and current sources at internal frequency ω 0 , a...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2017-09, Vol.65 (9), p.4790-4796
Main Authors: Ozdemir, Sevda, Unal, Alper, Koksal, Adnan
Format: Article
Language:English
Subjects:
Antennas
Electromagnetic scattering
Impedance
Integral equations
Mathematical model
Method of moments
Scattering
shifted frequency internal equivalence (SFIE)
Surface impedance
surface tangent field equation (STFE)
volume field equation (VFE)
wideband method of moments (MoM)
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Summary:In this paper, a simple solution is presented for multifrequency electromagnetic scattering from inhomogeneous bodies. Shifted frequency internal equivalence is used to replace the electromagnetic problem at operating frequency ω by equivalent volume and current sources at internal frequency ω 0 , and hence repeated calculation of system matrix as in the solution of volume integral equation at multiple frequencies is avoided. The volume field equation and surface tangent field equations obtained from the internal and external problems, the substitutes of the original scattering problem internally and externally, are solved by method of moments with pulse function expansion and point matching. Numerical results demonstrate that the proposed method is accurate and efficient within a wideband, fractional bandwidth being typically 100%.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2017.2728119