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Design of wide bandwidth pyramidal microwave absorbers using ferrite composites with broad magnetic loss spectra

Content Provider	Springer Nature Link
Author	Park, Myung Jun Kim, Sung Soo
Copyright Year	2016
Abstract	Wide bandwidth microwave absorbers with a pyramidal shape and a significantly reduced thickness can be designed using high lossy ferrite materials with broad magnetic loss spectra. The microwave absorbing properties of pyramidal cone absorbers are analyzed using the transmission line approximation, which provides the reflection loss as a function of the material parameters and absorber geometry. Three types of ferrite materials (NiZn spinel ferrite, Co$_{2}$Z hexaferrite, and RuCoM hexaferrite) are used as the absorbent fillers in a rubber matrix. Among these, Co$_{2}$Z ferrite is the most suitable material for wide bandwidth pyramidal absorbers, due to its broad magnetic loss spectrum in the GHz frequency range. The optimal geometry of the pyramidal absorber is also determined using the transmission line theory. With the reduced total height of the pyramidal absorber (approximately 60 mm), a wide bandwidth (1.5-18 GHz with respect to the −20 dB reflection loss) can be realized. The proposed absorbers have a thickness advantage over the classical pyramidal ohmic absorbers; thus, they are suitable for small and semi-anechoic chambers.
Starting Page	610
Ending Page	614
Page Count	5
File Format	PDF
ISSN	17388090
Journal	Electronic Materials Letters
Volume Number	12
Issue Number	5
e-ISSN	20936788
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2016-07-28
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pyramidal absorbers wide bandwidth ferrite composites magnetic loss Optical and Electronic Materials Condensed Matter Physics Nanotechnology and Microengineering Characterization and Evaluation of Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials

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