A new approach to conductive electromagnetic interference （EMI） noise source modeling, i. e. the source internal impedance extraction, is presented. First, the impedance magnitude is achieved through an exciting pro...A new approach to conductive electromagnetic interference （EMI） noise source modeling, i. e. the source internal impedance extraction, is presented. First, the impedance magnitude is achieved through an exciting probe and a detecting probe, or through calculations based on insertion loss measurement results when inserting a series nigh-value known impedance or a shunt low-value known impedance in the circuit. Then the impedance phase is extracted by the Hilbert transform （HT） of the logarithm of the obtained impedance magnitude. Performance studies show that the estimated phase error can increase greatly at a zero frequency in the Hilbert transform because of the existence of a singular point, and this effect can be eliminated by introducing a zero-point when the noise source does not include a series-connected capacitive component. It is also found that when the frequency is nigher than 150 kHz, the estimated phase error is not sensitive to the inductive source but sensitive to the capacitive source. Finally, under the conditions of the same measurement accuracies for impedance magnitude, the accuracy of complex impedance based on the HT can be improved about 10 times when compared with the accuracy of estimated parameters based on the impedance magnitude fitting method （IMFM）.展开更多
无线射频识别技术(Radio Frequency Identincation)是一种利用无线电射频信号进行通信的非接触式自动识别技术,它具有高效、快速、可靠、非视距读取和可工作于恶劣环境等优点,被广泛应用在数据采集和商品识别领域。但由于开发一个RFID...无线射频识别技术(Radio Frequency Identincation)是一种利用无线电射频信号进行通信的非接触式自动识别技术,它具有高效、快速、可靠、非视距读取和可工作于恶劣环境等优点,被广泛应用在数据采集和商品识别领域。但由于开发一个RFID项目需要大量的资金、设备和人力资源的投入,而Rifidi的仿真应用解决了这一问题。Rifidi可以快速地评估多种不同的系统配置和方案的应用,从而使企业以最小的投入得到最大的效益产出。展开更多
基金The Natural Science Foundation of Jiangsu Province(No.BK2008429)Open Research Foundation of State Key Laboratory of Millimeter Waves of Southeast University(No.K200603)+1 种基金China Postdoctoral Science Foundation(No.20080431126)Jiangsu Postdoctoral Science Foundation(No.2007-337)
文摘A new approach to conductive electromagnetic interference （EMI） noise source modeling, i. e. the source internal impedance extraction, is presented. First, the impedance magnitude is achieved through an exciting probe and a detecting probe, or through calculations based on insertion loss measurement results when inserting a series nigh-value known impedance or a shunt low-value known impedance in the circuit. Then the impedance phase is extracted by the Hilbert transform （HT） of the logarithm of the obtained impedance magnitude. Performance studies show that the estimated phase error can increase greatly at a zero frequency in the Hilbert transform because of the existence of a singular point, and this effect can be eliminated by introducing a zero-point when the noise source does not include a series-connected capacitive component. It is also found that when the frequency is nigher than 150 kHz, the estimated phase error is not sensitive to the inductive source but sensitive to the capacitive source. Finally, under the conditions of the same measurement accuracies for impedance magnitude, the accuracy of complex impedance based on the HT can be improved about 10 times when compared with the accuracy of estimated parameters based on the impedance magnitude fitting method （IMFM）.
文摘无线射频识别技术(Radio Frequency Identincation)是一种利用无线电射频信号进行通信的非接触式自动识别技术,它具有高效、快速、可靠、非视距读取和可工作于恶劣环境等优点,被广泛应用在数据采集和商品识别领域。但由于开发一个RFID项目需要大量的资金、设备和人力资源的投入,而Rifidi的仿真应用解决了这一问题。Rifidi可以快速地评估多种不同的系统配置和方案的应用,从而使企业以最小的投入得到最大的效益产出。
