Suppression of Mode Conversion at Ethernet Connector by using Modal-Equivalent Circuit Model based on Imbalance Matching

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2020/12/01

タイトル(英語): Suppression of Mode Conversion at Ethernet Connector by using Modal-Equivalent Circuit Model based on Imbalance Matching

著者名: Md. Ashraful Islam (Graduate School of Natural Science and Technology, Okayama University), Kengo Iokibe (Graduate School of Natural Science and Technology, Okayama University), Yoshitaka Toyota (Graduate School of Natural Science and Technology, Okayama

著者名(英語): Md. Ashraful Islam (Graduate School of Natural Science and Technology, Okayama University), Kengo Iokibe (Graduate School of Natural Science and Technology, Okayama University), Yoshitaka Toyota (Graduate School of Natural Science and Technology, Okayama University)

キーワード: mode conversion，imbalance factor，primary- and secondary-common modes，modal-equivalent circuit model，shielded-twisted-pair cable，Ethernet connector

要約(英語): When a shielded-twisted-pair (STP) cable is connected with a printed circuit board (PCB) via an Ethernet (RJ45) connector, mode conversion between primary- and secondary-common modes occurs at the connector section due to their structural difference that causes the difference in the imbalance factor of the transmission line. In this paper, we investigate the suppression of the mode conversion at the connector section by using a modal-equivalent circuit model based on imbalance matching. We focus on improving the PCB pattern below the shielded Ethernet connector by placing a copper layer on the PCB surface, and the inadequate shielding at the connector section by soldering and wrapping with copper tape. The application of this improvement based on imbalance matching at the connector section makes the imbalance factor of the connector section closer to that of the cable section and results in the suppression of the mode conversion. Based on the concept of imbalance matching, we confirmed the effect of the shield-improved connector with an improved PCB pattern on the suppression of the mode conversion at the connector section through circuit simulation and measurement, and it was validated that the circuit simulation results obtained from the modal-equivalent circuit model agree well with the measurement results.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.140 No.12 （2020） 特集：2019年環境電磁工学国際シンポジウム（EMC Sapporo and APEMC 2019）

本誌掲載ページ: 586-592 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/140/12/140_586/_article/-char/ja/