Impedance Green´s functions in the spectral domain for layered anisotropic media

The authors present new formulations of the impedance Green´s functions in the spectral domain for general anisotropic media. The main advantages are: first, decoupling of the relationship between electric and magnetic field as opposed to dealing with coupled equations obtained when using other methods, and second, obtaining closed-form expressions of the different transverse-electric and transverse-magnetic wave propagation constants. This is essential for modeling substrates involving tensor components and for the rigorous analysis of microwave integrated circuit (MIC) and monolithic microwave integrated circuit (MMIC) structures on multiple layered anisotropic substrates. The theory was demonstrated for an example of microstrip lines on ferrite-dielectric substrates with different directions of magnetic bias. The numerical results were found to be in good agreement with previously published data.<>