フェライト混入率や電波吸収体設置方法による吸収効果 : フェライト混入モルタルのTV電波吸収特性に関する研究

概要

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Recently, a very important problem in the city is electromagnetic interferences caused by buildings. For example, a ghost phenomenon is caused by interaction between incident and reflected TV waves by large buildings. So, there are greater needs to change the finishing materials of the outside wall of large buildings into TV wave absorbers, particularly VHP wave absorbers. Characteristics of radio wave absorption were evaluated by return loss of radio wave every 5MHz from 50MHz to 250MHz. Return loss of each specimen can be calculated from experimental results. The results were as follows. 1) The more ferrite was mixed, the lower the superior frequency. Then return loss at a superior frequency was increased. 2) Under the condition in which reinforcement was placed, the range of radio wave absorption was widened and return loss was increased. So, the characteristic of radio wave absorption was improved by placing reinforcement. 3) Double decker radio wave absorbers composed of different mix ferrite mortars widen the range of radio wave absorption and increase return loss. So, the characteristics of radio wave absorption were also improved by composing different mix ferrite mortars.
社団法人日本建築学会の論文
1996-04-30