센더스트를 이용한 적층형 전파흡수체의 개발

Abstract

The remarkable advance of modern electronics and communication technology has made high frequency conversion, miniaturization, digitalization. However, EM (Electromagnetic) wave environments have become more complicate and difficult to control. Therefore, international organizations such as the ANSI (American National Standards Institute), FCC (Federal Communications Commission), and CISPR (the Committee International Special des Perturbations Radioelectrique), etc. have provided international or local standards for the EM wave environments and for the EMC (Electromagnetic Compatibility).

EM wave absorbers are used to protect electronic devices, such as personal communications and wireless LAN systems from unwanted EM wave radiations. In order to develop a more advanced EM wave absorbers, it is important to develop new materials for EM wave absorbers instead of soft and hard magnetic materials, such as Mn-Zn, Ni-Zn, Ba, and Sr ferrites which have been used conventionally.

In this thesis, the experiments for two kinds of materials. First, Multi-layer EM wave absorbers were studied using Sendust. As a result, the bandwidth of the Multi-layer EM wave absorbers with the thickness of 4 mm using Sendust was obtained more than 10 dB in S-Band. Secondly, the mixing effects of Sendust and on Multi-layer EM wave absorbers were studied, where it was confirmed that the bandwidth of the multi-layer EM wave absorbers inter-mixing with the thickness of 3 mm has broadened compared with non-mixed Multi-layer Sendust EM wave absorbers in S-Band.