On the amount of magnetic material necessary in broadband magnetic absorbers
2008 (English)In: 2008 IEEE International Symposium on Antennas and Propagation (AP-S 2008), 2008, 1412-1415 p.Conference paper (Refereed)
In this paper we have examined the use of ferromagnetic particles for thin broadband RAMs. The permeability of the composite material was obtained from a well tested model for ferromagnetic materials and a result from homogenization theory. It was found that the resonance frequency of the composite is independent of the volume fraction of the particles and that a magnetic conductivity proportional to the volume fraction exists. Furthermore, we showed that a certain amount of magnetic material is required in order to maintain a low reflection and that there exists a lower bound on how thin we could expect the absorber to be. Numerical calculations show that, though thin, the RAM tends to be quite heavy, which might prevent the use of ferromagnetic material in RAM applications. These results may serve as guidelines when designing thin broadband RAMs.
Place, publisher, year, edition, pages
2008. 1412-1415 p.
absorbing media, composite materials, ferromagnetic materials, radar cross-sections, broadband magnetic absorbers, composite material, ferromagnetic materials, ferromagnetic particles, homogenization theory, magnetic conductivity, magnetic material necessary, random access memory, resonance frequency, thin broadband radar absorbing material, volume fraction
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-8541DOI: 10.1109/APS.2008.4619271ISI: 000261440600355ScopusID: 2-s2.0-55649111439ISBN: 978-1-4244-2041-4OAI: oai:DiVA.org:kth-8541DiVA: diva2:13892
QC 201009062008-05-282008-05-282010-09-06Bibliographically approved