Suppression effects of electromagnetic radiation from inner-lead portion molded by ferrite-resin composite

1999 IEEE International Symposium on Electromagnetic Compatability. Symposium Record (Cat. No.99CH36261) Pub Date : 1999-08-02 DOI:10.1109/ISEMC.1999.810204

T. Akino, Y. Ono, S. Shinohara, R. Sato

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引用次数: 3

Abstract

This paper describes the suppression effects of electromagnetic waves radiating from the inner-lead portion of lead terminals molded by ferrite-resin composite in semiconductor devices. First, using composites in molded cylindrical form having various ferrite powder content, the complex relative permeability and complex relative permittivity were measured using the Nicolson-Ross, Weir method. Next, the impedance of the inner-lead portion of the lead terminal specimens, molded by the same ferrite-resin composite, was measured. Following this, each of the lead terminal specimens was mounted on a printed wiring board settled in a shield box, and electromagnetic radiation from the inner-lead was measured in an anechoic chamber, while terminating one end of the lead terminal to a 50 ohms resistor and feeding a high frequency signal through the other end. The results of these experiments showed that electromagnetic radiation from the inner-lead portion can be effectively suppressed by molding the lead terminal by ferrite-resin composite having a ferrite powder content of 80 weight-% or greater.

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铁氧体-树脂复合材料模制内引线部分的电磁辐射抑制效果

本文研究了半导体器件中铁氧体-树脂复合材料对引线内引出部分辐射电磁波的抑制效果。首先，采用不同铁氧体粉末含量的圆柱形模压复合材料，采用Nicolson-Ross, Weir法测量复合相对磁导率和复合相对介电常数。接下来，测量由同样的铁氧体-树脂复合材料制成的引线端子样品的内引线部分的阻抗。随后，将每个引线端子试样安装在屏蔽盒内的印刷配线板上，在消声室中测量内部引线的电磁辐射，同时将引线端子一端接至50欧姆电阻，并通过另一端馈送高频信号。实验结果表明，采用铁氧体粉末含量≥80重量%的铁氧体-树脂复合材料模压引线端子，可以有效抑制内引线部分的电磁辐射。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1999 IEEE International Symposium on Electromagnetic Compatability. Symposium Record (Cat. No.99CH36261)

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