Validation of Prediction Method of Common-Mode Current Reduction Based on Imbalance Difference Model for Differential Transmission Line Placed Near Edge of Adjacent Ground Plane

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  • グラウンド端に近接した差動伝送線路を対象とした平衡度不整合モデルに基づくコモンモード電流低減量予測法の検証
  • グラウンド タン ニ キンセツ シタ サドウ デンソウ センロ オ タイショウ ト シタ ヘイコウド フセイゴウ モデル ニ モトズク コモンモード デンリュウ テイゲンリョウ ヨソクホウ ノ ケンショウ

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Abstract

The electric asymmetry of a pair of differential transmission lines placed near an adjacent ground edge causes unwanted electromagnetic radiation when the adjacent ground width changes. In this paper, the imbalance difference model which has been proposed by the authors is verified by experiment and full-wave simulation for asymmetric differential transmission lines at different distances from the adjacent ground edge. The difference in secondary-common mode current in terms of the distance from the ground edge coincides with an error of up to 3 dB among the imbalance difference model, measurement, and electromagnetic simulation. Therefore the imbalance difference model has sufficient accuracy for practical use in designing differential transmission lines which produce less undesired emissions.

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