In this paper analysis and simulation ofthe eigen-mode fields of two sandwich coupledslot-lines with ferrite and dielectric layers arecarried out by using the finite element methodwith edge elements. Based on the analysis andsimulation, different devices such as switches andfour-port circulators, as well as directionalcouplers could be constructed by selecting theappropriate operating frequency, coupling lengthand bias magnetic field.

In this paper, finite-element method (FEM) formu- lations with edge elements for directly calculating the phase con- stants of ferrite-loaded waveguides with arbitrarily magnetized directions are presented. Dispersion characteristics are calculated for the partially-filled ferrite rectangular waveguide structure, where the dc field is in any arbitrary direction including parallel to any of the three axes. The variation of phase constants with the direction of dc magnetic field is illustrated. In order to solve the quadratic eigenvalue equation, which appears in the case where the magnetized direction is not parallel to the propagation, a simple and effective approach is proposed with no increase in the size of the matrices.

In this paper a detailed analysis of asandwich coupled slotline with axially or transverselymagnetised ferrite layer has been carried out by usingFEM with edge elements. Comparison of dispersioncharacteristics and phase shift shows that the variablereciprocal phase shift is larger with axial bias fieldthan with transverse field, and that non-reciprocalphase shift per unit length (with transverse field) in-creases with frequency whereas reciprocal phase shiftper unit length (with axial field) decreases with fre-quency. Also conductor-backed coplanar structuresmaybe more suitable than suspended structures.

In this paper, the finite element method incorporated with Floquet theorem is used to solvethe 2-Dimentsional scattering problem of dielectric periodic structures that a plane wave is oblique orperpendicular incident. Comparisons of reflection and transmission properties for a kind of dielectricPhotonic Crystals with different structure parameters are nresented..