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김경용,김왕섭,주윤돈,정형진 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.6
Ferrite electromagnetic wave absorber whose attenuation ability are mainly relied on their magnetic loss, has been used in relatively narrow wave frequency ranges. In this study, we tried to produce a wide-range electromagnetic wave absorber by laminating sintered ferrite (Mn0.07Ni0.28Zn0.65Fe2O4) and dielectrics (Cordierite). We also investigated effects of dielectric constant and thickness on the attenuation behavior of the absorber. Applicable band width, in which the attenuation is greater than 20 dB can be widened from 100∼700 MHz of ferrite alone to 100∼900MHz by employing the laminated structure. Thickness of dielectrics to achieve wide-range application decreased as the dielectric constant increased.
30 MHz~1000 MHz 고주파 대역에서 Ni-Zn 계 페라이트의 소결조건에 따른 전파흡수 특성
김경용,김왕섭,주윤돈 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.8
Recently intensive studies have been focussed on ferrites which have high magnetic loss because of the increasing need for the prevention of EMI (Electromagnetic Interference). We investigated effects of microstructures of Ni-Zn ferrites on magnetic losses, magnetic properties, and behaviors of electromagnetic wave absorbers. The characteristics of the absorber were influenced by the sintering conditions. A Ni-Zn ferrite with the thickness of 7$^{\circ}C$/min and the cooling rate of 7$^{\circ}C$/min. It satisfied the absorbing properties in the wide frequency ranges including VHF (90∼220 MHz), UHF (470∼770 MHz)