Korea Institute of Science and Technology

Wang S Kim

Kyung Y Kim

Hyung Jin Jung

Hue Sup Song

Kwang Ho Chang

Jung Rak Yun

Yoon D Ju

There is disclosed a dielectric material for high frequencies comprising a composition system represented by the following formula:

Dielectric material for high frequencies

This invention relates to a broad bandwidth electromagnetic wave absorber comprising a sintered ferrite and a CuO--Fe.sub.2 O.sub.3 system. The CuO--Fe.sub.2 O.sub.3 system, a spinel ferrite, has its own magnetic property, which makes it possible to be used for an electromagnetic wave absorber. The CuO--Fe.sub.2 O.sub.3 system is preferentially located at the grain boundary in the matrix ferrite. This resulted in increase in the total loss, decrease in matching thickness and shift in the center frequency.

Wide band type electromagnetic wave absorber

Ferrites as an electromagnetic wave absorber have their unique attenuation ranges depending on their compositions. The possibility of controlling attenuation characteristics of ferrite absorber by forming laminates of ferrite is disclosed. This invention provides that the center frequency of laminated ferrites could be changed arbitrarily employing ferrite with different composition and thickness. The method consists of stacking at least two soft ferrite layers (Ni-Zn, Mn-Zn) with various thickness.

Growing community of inventors

Kyungki-Do, South Korea

Wang S Kim