A study on the behavior of laminated electromagnetic wave absorber

Since ferrites are electromagnetic wave absorbing materials of composition-dependent resonance type, useful frequency ranges are typically narrow. In the present study, laminated electromagnetic wave absorbers composed of ferrite-ferrite or ferrite-dielectric layers were constructed to improve electromagnetic wave absorbing properties. When ferrites of different composition and thickness were layered, center frequency of the laminated ferrite could be changed over a range of values lying between the center frequencies of each ferrite. Compared with monolithic ferrites, ferrite-dielectric laminates exhibited broader frequency ranges with 20 dB or more attenuation.<
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