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■ページ数 8ページ



Attenuation Band Impedance Matched BRF for Measurements of Electromagnetic Noise

■著者名 林 潤(双信電機(株)),二川 佳央(国士舘大学理工学部 理工学科)
■著者名(英語) Jun Hayashi (SOSHIN ELECTRIC CO., LTD.), Yoshio Nikawa (School of Science and Engineering, Kokushikan University)
■価格 会員 ¥550 一般 ¥770
■書籍種類 論文誌(論文単位)
■グループ名 【C】電子・情報・システム部門
■本誌 電気学会論文誌C(電子・情報・システム部門誌) Vol.142 No.8 (2022) 特集T:Smart Cityのためのセンシング/モビリティ/情報通信技術 特集U:サステナブル社会実現に向けた情報・システム技術
■本誌掲載ページ 811-818ページ
■原稿種別 論文/日本語
■電子版へのリンク https://www.jstage.jst.go.jp/article/ieejeiss/142/8/142_811/_article/-char/ja/
■キーワード 電磁ノイズ,帯域除去フィルタ,90°ハイブリッドカプラ   EMI,band rejection filter,90 degrees hybrid coupler
■要約(英語) Wireless communication devices such as wireless LANs and RFIDs are essential for smart home appliances and IoT (Internet of Things) devices in Smart Cities. When measuring the high-frequency noise generated by devices, wireless signals of wireless communication devices and high-frequency noise are measured at the same time. As a result, spectrum analyzers have insufficient dynamic range, or the excess signal from wireless communication devices causes harmonic distortion of the mixer inside the receiver, resulting in inaccurate measurements. Accordingly, a band rejection filter (BRF) is required to attenuate the radio signal. CISPR 16-2-3:2016+A1: 2019 assumes that impedances are matched for measurement, so if the impedance mismatch is large, the expanded uncertainty specified in CISPR 16-4-2:2011+A1:2014+A2:2018 increases. In this study, we propose a new BRF with impedance matching in the attenuation range and show its principle. As a result, the extended uncertainty could be reduced to 3.96 dB for the BRF of this study compared to 10.63 dB for the conventional BRF. In addition, the method comparison of CISPR 16-2-3:2016+A1: 2019 and vector network analyzer shows that the difference in attenuation of the conventional BRF was about -0.8 to 3.3 dB, whereas the BRF in this study were about -0.2 to 0.3 dB. The reduction of the expanded uncertainty and the good measurement results confirm the high usefulness of the CISPR 16-2-3 measurement system for the measurement of weak electromagnetic noise.
■版 型 A4
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