Comprehensive analysis of strip- and slot-line guided forward, backward, and complex magnetostatic waves

Abstract

This paper presents a comprehensive and accurate analysis of the guidance of volume and surface magnetostatic waves by strips or slots in the presence of a ferrite slab magnetized to saturation by an external uniform magnetic field. The strip/slot can be directly printed on the ferrite surface or separated from it by means of a dielectric layer of arbitrary thickness. The problem is posed in terms of a suitable integral equation accounting for the magnetostatic limit. This equation is solved by using a spectral-domain formulation. The proposed method allows for the consideration of arbitrary magnetization angles and the presence of upper and/or lower ground planes. Strip-guided forward, backward, and complex surface magnetostatic waves have been obtained and analyzed in terms of the appropriate waveguide parameters. Slot-guided backward volume magnetostatic waves have been also computed and studied. Theoretical results have been checked against theoretical (magnetostatic and full wave) and experimental data available in the literature with reasonable agreement.

Quasi-TEM model of magnetostatic-surface wave excitation in microstrip lines

“…Taking into account the current function in [5], the structure of Fig. 1, this current is (4) and therefore (5) Moreover, in the quasi-TEM approximation , the -component of the magnetic field can be related with the vector potential in the same form (6) Taking into account (5) and (6), and the magnetostatic Green's function reported in [5], the following equation is obtained:…”

“…The magnetic Green's function is obtained following the guidelines shown in [4] and is related with the magnetostatic Green's function that appears in [5]. Taking into account the current function in [5], the structure of Fig.…”

“…The location of these poles is obtained following the method explained in [5]. The basis functions of the Galerkin's method for the surface current density are nonuniformly spaced triangular shaped functions [6].…”

Fundamental wave phenomena on biased-ferrite planar slab waveguides in connection with singularity theory

“…F ERRITE materials have been extensively used in various nonreciprocal devices such as phase shifters, polarizers, and isolators, where the electromagnetic properties of such devices can be controlled by varying the applied magnetic bias field [1]- [3]. A comprehensive literature review of microwave ferrite technology and various ferrite components, including circulators, isolators, phase shifters, YIG filters, and nonlinear magnetic microwave devices is given in [4].…”

“…Regarding fundamental modal phenomena, surface magnetostatic and dynamic modes supported by ferrite structures have been of primary interest for a long time. Surface magnetostatic and dynamic modes of a biased-ferrite slab waveguide were studied in [5]- [9], and magnetostatic volume and surface waves on printed strip and slot lines and circular microstrip resonators were recently investigated in [3], [10], and [11]. Complex modes in ferrite loaded parallel-plate waveguides and shielded finlines were analyzed in [12] and [13], respectively.…”