Study of propagation characteristics of ferrite loaded layerd waveguide systems

Abstract

The objective of this study is to examine the propagation characteristics of electromagnetic waves in ferrite loaded layered structures. In this work, the propagation characteristics of various hybrid structures with ferrite film as one of the components have been subjected to rigorous analysis and computations. The hybrid structures are formed by different kinds of combinations of ferrite films with films of high temperature superconductors, linear dielectrics and nonlinear dielectrics of general nonlinearity. The structures considered are a standalone ferrite film, ferrite/ dielectric/ferrite, ferrite/superconductor/ferrite, ferrite/superconductor, superconductor/ferrite/superconductor, ferrite/dielectric/superconductor, nonlinear dielectric substrate/ferrite/nonlinear dielectric cladding, ferrite substrate/nonlinear dielectric cladding, ferrite substrate/nonlinear ferroelectric and microstrip structures with ferrite substrate. Using Maxwell s equations, dispersion relations corresponding to electromagnetic wave propagation are derived for each structure. Numerical results are presented for each case and dependence of propagation on various structural parameters, frequency and ferrite biasing magnetic field are discussed. The non-reciprocal nature and magnetictunability of propagation in the structures are examined. In many cases the propagation is nonreciprocal, as expected from the use of ferrite film in the structures. It has also been established that the power propagation in the nonlinear structures are nonreciprocal as well as magnetically tunable. A microstrip line and a slot line on magnetized ferrite substrates have been analyzed using spectral domain approach. Dispersion has been examined for forward and reverse propagations and it is seen that the propagation is non-reciprocal in both the structures.