Impedance Variation of a Reflection Probe Near the Edge of a Magnetic Metal Plate

The field and impedance change of a reflection probe in the vicinity of the edge of a magnetic metal plate is investigated by the truncated region eigenfunction expansion (TREE) method. The analysis is implemented with the second-order vector potential (SOVP), and the double Fourier series are formulated compactly with the matrices. To solve the eigenvalue problem for the magnetic metal plate, an adaptive approach based on the 1-D finite-element method (FEM) is proposed, and the complex eigenvalues can be calculated automatically. The proposed method is compared numerically with the 3-D FEM, and good agreement is achieved in all cases.