电路辐射干扰机理诊断与特性估计

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Abstract Since it’s not easy to detect the radiated electromagnetic interference (EMI) mechanism of high frequency(HF) circuits by using far field-based measurement and also for the complexity of electromagnetic (EM) measurement, a diagnosis approach for radiation mechanism based on near field measurement together with an estimation approach for radiated EMI in space are presented in this paper for HF circuits. First, according to the relationship between the wave impedance achieved by near field EM probe measurement and the measured field point’s position, the radiation mechanism diagnosis could be realized on the use of performance analysis of common mode (CM) and differential mode (DM) radiation in near field. Next, considering the governing relation between the CM radiated current and its total EM field in space, the estimation approach could then be acquired based on RF common mode current measurement. Additionally, some experiments for different wireless communication devices and HF digital printed circuit boards are completed using above methods and also results are compared with chamber results which shows good agreement (error<5.13%), and thus good validity.

Key words： Electromagnetic compatibility (EMC) electromagnetic interference (EMI) HF circuit diagnosis mechanism performance estimation

Received: 17 November 2009 Published: 04 March 2014

PACS:	TM461
	TN03

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	Zhao Yang
	Yan Wei
	Zhao Bo
	Luo Yongchao
	Li Shijin

Cite this article:

Zhao Yang,Yan Wei,Zhao Bo等. EMI Radiated Noise Diagnosis and Estimation for HF Circuits[J]. Transactions of China Electrotechnical Society, 2010, 25(10): 6-13.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I10/6

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