Experimental Realization of Strong DC Magnetic Enhancement with Transformation Optics
2014 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 146, 187-194 p.Article in journal (Refereed) Published
A passive DC magnetic concentrator is designed with transformation optics (TO) and realized by meta-materials. The passive DC magnetic concentrator based on space compression transformation can greatly enhance the magnetic field in a free space region and can be used for e.g., improving the sensitivity of magnetic sensors and increasing the efficiency of wireless energy transmission. The magnetic property of the medium obtained by TO is extremely anisotropic. To solve this, we use magnetic metamaterials made of alternated high-permeability ferromagnetic (HPF) materials and high-temperature superconductor (HTS) materials. We optimize our structure by conducting simulations using the finite element method (FEM) and experimentally demonstrate a strong, 4.74-time enhancement of the DC magnetic field by our meta-material magnetic concentrator. We also demonstrate that a simplified structure with only HPF materials working at room temperature can still gives 3.84-time enhancement of the DC magnetic field. The experimental results are in good agreement with the numerical simulations based on FEM.
Place, publisher, year, edition, pages
2014. Vol. 146, 187-194 p.
Positive Permeability, Cloak, Field
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-149239DOI: 10.2528/PIER14042704ISI: 000339161500019OAI: oai:DiVA.org:kth-149239DiVA: diva2:738890
FunderSwedish Research Council
QC 201408192014-08-192014-08-182014-11-05Bibliographically approved