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

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 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 the band width of 30 MHz to 2150 MHz or 2430 MHz under the tolerance limits of -20dB reflectivity, were designed.