Scattering from a thin magnetic layer with a periodic lateral magnetization : application to electromagnetic absorbers

• A magnetized thin layer mounted on a PEC surface is considered as an alternative for an absorbing layer. The magnetic material is modeled with the Landau-Lifshitz-Gilbert equation, with a lateral static magnetization having a periodic variation along one lateral direction. The scattering problem is solved by means of an expansion into Floquet-modes, a propagator formalism and wave-splitting. Numerical results are presented, and for parameter values close to the typical values for ferro- or ferrimagnetic media, reflection coefficients below -20 dB can be achieved for the fundamental mode over the frequency range 1-4 GHz, for both polarizations. It is found that the periodicity of the medium makes the reflection properties for the fundamental mode almost independent of the azimuthal direction of incidence, for both normally and obliquely incident waves.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Electromagnetism

Ferromagnetism

Magnetic devices

Magnetization

Magnets

Reflection

Absorbing layers

Azimuthal directions

Electromagnetic absorbers

Floquet

Frequency ranging

Fundamental modes

Landau-Lifshitz-Gilbert equations

Magnetic layers

Numerica l results

Obliquely incident waves

Parameter values

Periodic variations

Reflection coefficients

Reflection properties

Scattering problem

Static magnetization

Thin layering

Typical values

Electrophysics

Elektrofysik

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)