Study on the Characteristics of RF-EMI suppressing devices

RF-EMI抑制器件特性研究

• 批准号: 13650295
• 负责人: SUGIURA Akira
• 金额: $ 2.18万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650295/
• 关键词: Electromagnetic Interference; Ferrite core; EMI antenna; Antenna calibration; Wide band antenna; 伝導妨害波

In recent years, personal wireless systems such as mobile radio and wireless LANs have been developed very rapidly. On the other hand, the operating frequency of IT equipment and other devices has been increased up to the GHz frequency band to achieve greater performance. Hence strong anxieties have been raised about the possible interference with wireless systems caused by electromagnetic disturbances emitted from such devices. To control interference, IEC/CISPR has been studying the limits and measurement methods of the radiated emissions above 1 GHz. To comply with the regulations, a variety of EMI suppressing devices such as ferrite cores are used in electronic equipment. But, design methods have not been established for such EMI suppressing devices.Thus, this research project theoretically and experimentally investigated the noise reduction capability of the EMI suppressing devices and the related measurement methods above 1 GHz.1.Measurement method of wideband radiated emissionsRadiated disturbances from electronic equipment are requested to be measured with antennas in accordance with the relevant regulations. Hence EMI measuring antennas are one of the most important equipment in the measurement system. Therefore, accurate calibration method has been developed in this project for characterizing various wide band EMI antennas.2.Characteristics of EMI ferrite coresEMI ferrite cores are commonly used for the purpose of reducing the disturbance current flowing on the power lines of electric equipment. However, reduction mechanism and characteristics of the ferrite cores have not been fully investigated so far. Accordingly, this project investigated a new method for measuring the effectiveness of EMI ferrite cores in reducing the disturbance, and then tried to develop the design method to yield suitable materials and structures of ferrite cores.

近年来，移动无线电、无线局域网等个人无线系统得到了迅速发展。另一方面，IT设备和其他设备的工作频率已提高到GHz频段，以实现更高的性能。因此，人们对这些设备发出的电磁干扰可能对无线系统造成的干扰产生了强烈的担忧。为了控制干扰，IEC/CISPR一直在研究1ghz以上的辐射发射限值和测量方法。为了遵守这些规定，电子设备中使用了各种各样的电磁干扰抑制器件，如铁氧体铁芯。但是，这种电磁干扰抑制装置的设计方法尚未建立。因此，本课题从理论和实验两方面研究了1 ghz以上的电磁干扰抑制器件的降噪能力及相关的测量方法。宽带辐射发射的测量方法电子设备的辐射干扰要求用天线按照有关规定进行测量。因此，电磁干扰测量天线是测量系统中最重要的设备之一。因此，本项目开发了一种精确的校准方法来表征各种宽带电磁干扰天线。电磁干扰铁氧体电芯的特性电氧体铁氧体铁芯通常用于减少电气设备电源线上的干扰电流。然而，对铁氧体铁芯的还原机理和特性研究尚不充分。因此，本课题研究了一种测量电磁干扰铁氧体铁芯减少干扰效果的新方法，并尝试开发出合适的铁氧体铁芯材料和结构的设计方法。

项目成果

高島 誠: "ダブルギャップシールデッドループアンテナの磁界複素アンテナ係数の測定"電子情報通信学会論文誌. J84-B・11. 2066-2070 (2001)

高岛诚：“双间隙屏蔽环形天线的磁场复合天线系数的测量”电子信息通信工程师学会学报J84-B·11（2001）。

Y.Dowaki: "Effectiveness of ferrite clamps for reducing common-mode noises"International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology, St.Petersburg,2003. (to be presented). (2002)

Y.Dowaki：“铁氧体钳位对降低共模噪声的有效性”电磁兼容性和电磁生态学国际研讨会，圣彼得堡，2003 年。

K.Fujii: "Site Attenuation on an Absorber-Lined Ground Plane"PIERS 2002 (Progress in Electromagnetics Research Symposium). 37-37 (2002)

K.Fujii：“吸收器衬里地平面上的站点衰减”PIERS 2002（电磁学研究研讨会进展）。

S.Kaketa: "A Novel method for EMI antenna calibration on a metal ground plane"2003 IEEE International Symposium on EMC. MOA-P1-MOA-P8 (2003)

S.Kaketa：“金属接地层上 EMI 天线校准的新颖方法”2003 年 IEEE 国际 EMC 研讨会。

S.Kaketa: "EMI Antenna Calibration on using the Antenna Impedance Measurement"International Symposium on Antennas Propagation and EM Theory. 792-795 (2003)

S.Kaketa：“使用天线阻抗测量进行 EMI 天线校准”天线传播和电磁理论国际研讨会。