Title :
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
fDate :
5/1/1996 12:00:00 AM
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;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
