Electromagnetic wave absorber with wide-band frequency characteristics using exponentially tapered ferrite

Author

Kim, Dong II ; Takahashi, Michiharu ; Anzai, Hiroki ; Jun, Sang Yup

Author_Institution

Dept. of Radio Sci. & Eng., Korea Univ., Pusan, South Korea

Volume

38

Issue

2

fYear

1996

fDate

5/1/1996 12:00:00 AM

Firstpage

173

Lastpage

177

Abstract

As a countermeasure of EMI or EMC, various types of electromagnetic wave absorbers are used. A wide-band design method of an electromagnetic wave absorber with using exponentially tapered ferrite, which has very wide-band frequency characteristics, is proposed and discussed. The wide-band electromagnetic wave absorber can be designed under some approximations by the theoretical model using the equivalent material constants (equivalent complex permittivity and permeability) method for the regions varying spatially in the shape of ferrite. Based on the model, wide-band electromagnetic wave absorbers with taper, which have not only excellent reflectivity frequency characteristics but also a bandwidth of 30 MHz to 2150 MHz or 2430 MHz under the tolerance limits of -20 dB reflectivity, were designed

Keywords

electromagnetic compatibility; electromagnetic interference; electromagnetic wave absorption; ferrite devices; magnetic permeability; permittivity; reflectivity; 30 to 2150 MHz; 30 to 2430 MHz; EMC; EMI; bandwidth; equivalent complex permeability; equivalent complex permittivity; equivalent material constants method; exponentially tapered ferrite; reflectivity frequency characteristics; theoretical model; tolerance limits; wideband design method; wideband electromagnetic wave absorber; wideband frequency characteristics; Design methodology; Electromagnetic compatibility; Electromagnetic interference; Electromagnetic modeling; Electromagnetic scattering; Ferrites; Frequency; Permittivity; Reflectivity; Wideband;

fLanguage

English

Journal_Title

Electromagnetic Compatibility, IEEE Transactions on

Publisher

ieee

ISSN

0018-9375

Type

jour

DOI

10.1109/15.494620

Filename

494620