共振のQ制御による漏洩電磁界の抑止

概要

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This paper is to clarify the methods to improve the degradation of shielding effectiveness by a low Q-factor in shielded enclosure; particularly to improve the degradation of shielding effectiveness by realising low Q at anti-resonance frequency in low frequencies. In shielded enclosure, there are several eigenfrequencies which are decided by geometric structures. At these eigenfrequencies, we can generally observe resonance and anti-resonance phenomna. The shielding effectiveness is low in anti-resonance frequency while it is high in resonance frequency. In order to avoid the degradation of shielding effectiveness, we have to lower a Q-factor at shielded enclosure. There are two methods to realize this purpose. One method is to realize low-Q by improving the shape of shielded enclosure. The other is to change a dielectric constant ε and/or permeability μ in space of the enclosure by using some microwave absorber.
社団法人映像情報メディア学会の論文
1990-11-16