Acta Metallurgica Sinica(English letters) ›› 2015, Vol. 22 ›› Issue (1): 77-82.doi: 10.1016/S1005-8885(15)60628-8

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Analysis on the effectiveness of decoupling capacitor on mitigating radiated emission from power ground planes by BEM

温舒桦1,张金玲1,胡玉生2   

  1. 1. 北京邮电大学
    2. 集美大学
  • 收稿日期:2014-06-30 修回日期:2014-11-25 出版日期:2015-02-28 发布日期:2015-02-28
  • 通讯作者: 温舒桦 E-mail:wshmk@sina.cn
  • 基金资助:

    太赫兹辐射源设计和波谱整形技术研究

Analysis on the effectiveness of decoupling capacitor on mitigating radiated emission from power ground planes by BEM

  • Received:2014-06-30 Revised:2014-11-25 Online:2015-02-28 Published:2015-02-28
  • Contact: Shu-Hua WEN E-mail:wshmk@sina.cn

摘要: The radiation emission (RE) of multilayer printed circuit board (PCB) will cause electromagnetic compatibility problem. An efficient numerical method for evaluating the effectiveness of decoupling capacitors in reducing RE from power ground (P/G) planes in PCB was presented. A two-dimensional boundary-element method (BEM) was used to establish the radiation model. Then, the RE was calculated by equivalent magnetic current of edge field around P/G planes. Furthermore, the radiation and input impedance of P/G planes mounted decoupling capacitors were calculated for frequency up to 5 GHz. The results were compared to those of the case without decoupling capacitors. It shows that the decoupling capacitors can effectively decrease RE except for anti-resonant frequency. At higher frequencies, the decoupling effectiveness mainly depends on the parasitic inductance of capacitor pin rather than the value.

关键词: printed circuit board, radiation emission, decoupling capacitors, boundary-element method, equivalent magnetic current

Abstract: The radiation emission (RE) of multilayer printed circuit board (PCB) will cause electromagnetic compatibility problem. An efficient numerical method for evaluating the effectiveness of decoupling capacitors in reducing RE from power ground (P/G) planes in PCB was presented. A two-dimensional boundary-element method (BEM) was used to establish the radiation model. Then, the RE was calculated by equivalent magnetic current of edge field around P/G planes. Furthermore, the radiation and input impedance of P/G planes mounted decoupling capacitors were calculated for frequency up to 5 GHz. The results were compared to those of the case without decoupling capacitors. It shows that the decoupling capacitors can effectively decrease RE except for anti-resonant frequency. At higher frequencies, the decoupling effectiveness mainly depends on the parasitic inductance of capacitor pin rather than the value.

Key words: printed circuit board, radiation emission, decoupling capacitors, boundary-element method, equivalent magnetic current