Shifted-frequency internal equivalence

Koksal A.

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, cilt.46, sa.1, ss.76-81, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 46 Konu: 1
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1109/22.654925
  • Sayfa Sayıları: ss.76-81


The shifted frequency internal equivalence (SFIE) theorem involving inhomogeneous regions is introduced and proven, For a lossless inhomogeneous region using a vector Green's theorem and potential formulation, it is shown that the frequency-domain electromagnetic field at frequency omega inside the region can be obtained using a set of equivalent volume and surface currents radiating in free space and at the different frequency omega(0) The equivalent currents thus obtained are functions of the two frequencies, electric-and magnetic-volume-type sources of the original problem, material parameters, and the original field phasors at omega, and they only exist inside the region and on its boundary. A direct application of this equivalence is that it can be used to construct an internal equivalence at a shifted frequency for electromagnetic scattering problems if data are needed in a band of frequency. omega(0) can be kept constant while the incident field frequency changes and, as a result, full computation of fields at each different frequency for volume-type equivalent sources can be avoided.