Analysis of a fast-acting waveguide ferrite phase shifter with longitudinal magnetization phasing structure

Elena V Komissarova,Yury S Rusov,Vladimir M Krekhtunov,P Yermolov

doi:10.1051/itmconf/20193006013

Elena V Komissarova, Yury S Rusov + Show 2 more

Open Access

https://doi.org/10.1051/itmconf/20193006013

Copy DOI

Abstract

The electrodynamic analysis and calculation of the phasing structure of a waveguide ferrite Faraday phase shifter with longitudinal magnetization of a ferrite rod with a square cross-section are performed. In the strict electrodynamic formulation, the Galerkin method solves the key problem for the design of the phase shifter: the problem of eigenwaves finding with a second-order differential magnetic operator in the projection procedure for a rectangular waveguide with a transversely inhomogeneous ferrite-dielectric filling under longitudinal magnetization. The problem is reduced to solving the complete eigenvalue problem of a complex matrix. The computational algorithm, implemented as a computer program in DELPHI, gives in one procedure the numerical values of the coefficients of the decomposition of fields in the form of eigenvectors of the matrix, and the coefficients of wave propagation in the form of its eigenvalues. The results of calculations of the phasing structure activity for two particular cases of its implementation are presented: on the basis of a ferrite rod both with a conductive coating and without a coating, it is shown that in the second case the activity of the phase shifter is 1.5 times higher. For the real parameters of the ferrite medium, the length of the phasing structure is calculated depending on the transverse dimensions of the ferrite rod and the square waveguide, which ensures the creation of a 360° controlled phase shift.

Highlights

Waveguide Faraday ferrite phase shifters (WFFPS) with longitudinal magnetization are widely used in the microwave and EHF bands technique, both as standalone devices in waveguides [1, 2], and as a part of devices, for example, elements of integrated phased antenna arrays (PAA) [3, 4, 5, 6]
WFFPS,which is built on the basis of the ferrite rods (FR), which does not have a conductive coating of the side surface, is free from these disadvantages [5, 6, 7]
In the strict electrodynamic formulation by the Galerkin method using a second-order differential magnetic operator in the projection procedure, the key problem for the development of the WFFPS – the problem of eigenwaves of a waveguide with a transversely inhomogeneous ferrite-dielectric filling under longitudinal magnetization is solved

Summary

Introduction

Waveguide Faraday ferrite phase shifters (WFFPS) with longitudinal magnetization are widely used in the microwave and EHF bands technique, both as standalone devices in waveguides [1, 2], and as a part of devices, for example, elements of integrated phased antenna arrays (PAA) [3, 4, 5, 6] As a rule, these WFFPS are performed on the basis of ferrite rods (FR) with a round or square cross-sectional shape [4, 5, 6]. WFFPS,which is built on the basis of the FR, which does not have a conductive coating of the side surface, is free from these disadvantages [5, 6, 7] Such WFFPS has the longitudinal magnetization system and the magnetic core providing device magnetic memory are placed inside a waveguide. While using a phase shifter with magnetic memory based on anonmetallized ferrite rod, i.e. without a conductive coating of its side surface, the device becomes multimode, its calculation becomes more complicated and there is a need for highlevel electrodynamic models

Object and research methods

A N N I I t m n tmn tmn t m n tmn1 t m n 1 m n mn tmn2 t m n 2 m n mn m

Numerical results

Summary