Guided magnetostatic surface waves on a metallic strip line

Abstract

This paper gives a theoretical analysis for the geometrical configuration of a metallic strip deposited on ferrite film, which is available for MSSW (magnetostatic surface wave) waveguide. Dispersion curves and magnetic potential distributions are presented when the metallic strip of 100 μm wide is placed on the ferrite film of 10 μm thick. Since MSSW propagates along either the top surface with the strip, or the bottom face with no strip depending on its propagating direction, a strip-guided mode is nonreciprocal in the energy trapping effects, the number of guided modes, and the frequency bands.

Efficient analysis of magnetostatic surface waves in printed and suspended ferrite loaded strip lines

“…A similar good agreement is found in Fig. 2, where our results for a printed unshielded strip line are compared with those reported in [4]. The MSSW modes in Table I and Fig.…”

“…2 also shows how the phase constant and time delay of the MSSWs can be substantially increased by reducing the strip width, an effect of potential practical interest. The disper- Comparison with the results in [4] is also shown. sion curve for the MSSW guided by the non metallized ferrite slab is also shown in Fig.…”

“…This fact suggests that nonradiating (bounded) MSSWs can be guided by a metallic strip placed on a ferrite slab in the frequency range , since in this range the MF interface allows propagation but the DF interface precludes it. In fact, in [4] it is shown that unidirectional MSSWs are guided by strips printed on ferrites in the whole range , although in the range unbounded MSSWs can be also guided by the DF interface. In this paper we are interested in studying the guidance of bounded MSSWs along the more general structure in Fig.…”

“…This fact can be understood from both the magnetostatic [4] and the full-wave analysis [5] and implies that the usual definition of line characteristic impedance, , does not apply to the analysis of strip-guided magnetostatic waves, since it yields . Also, the line voltage is a meaningless concept for MSSWs (is for this reason that MSSWs can be guided by the ungrounded structure of Fig.…”

“…Propagation of MSSWs along strip lines printed over a ferrite slab with magnetic bias field perpendicular to the strips and parallel to the slab interface has been analyzed in [4]. In the present paper we apply an integral SDA to obtain the MSSWs guided by strip lines printed or suspended over a ferrite slab.…”