STUDY ON THE ELECTROMAGNETIC ABSORPTION IN THE UHF WAVE BAND BY THE PARALLEL WIRE LINE

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  • 平行二線線路によるUHF帯用電波吸収体の研究
  • ヘイコウ 2セン センロ ニ ヨル UHF タイヨウ デンパ キュウシュウタイ ノ ケンキュウ

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Abstract

The two measurement methods of electromagnetic characteristic have developed by using the parallel wire line in the UHF band(400-800MHz). One is the measurement method of the return loss in the vertical electromagnetic wave, the other is the return loss in the diagonal electromagnetic wave. The types of electromagnetic absorption are a single layer type and a double layers type. The return loss of single layer is almost low, that of double layers has been improved. The combinations of recycling board and cement mortar mixed with electromagnetic absorption materials affect the electromagnetic characteristic of the return loss. The return loss in the diagonal wave can be calculated with the reflection coefficient and the angle of incidence. When the distance between absorption and reflection plate is one fourth of wave length, the return loss is bigger than that of the other distance.

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