In the electromagnetic compatibility (EMC) behavior of power electronic converters, magnetic parasitic couplings between components are one of the main causes of dysfunctions or bad filtering (e.g., in EMC filter). These couplings could be as conducted or near-field interferences. In order to handle interaction problems, a complete knowledge of these magnetic couplings is then necessary. Our study is focused on near magnetic field's interferences. Indeed, the characterization of electromagnetic field in power electronics is still in active research. This paper details a predictive method that calculates accurately and efficiently the near magnetic field coupling between two sources. By using the near-field multipolar expansion in spherical harmonics of electromagnetic sources, the close magnetic coupling between two sources is determined from their equivalent model. It is shown that the increase in degree up to the fourth provides a more precise representation of the elements and thus a better accuracy of the near-field coupling prediction. Also, theoretical and experimental developments will be presented. The coupling between two complex sources will be considered to validate the predictive method.Index Terms-Electromagnetic compatibility (EMC), near magnetic field coupling, power electronic, spherical harmonic.
Since the demand for autonomous wireless sensors increases, there is an important interest in battery-less systems that use radiofrequency (RF) energy harvesters. The key element on the receiving side of an energy harvesting system is the rectenna (rectifier + antenna) which receives electromagnetic power and converts it into electric continuous power. With the development of multiple frequency bands in today's wireless communication systems, the multi-band rectennas would be useful. Among various entities of rectenna, antenna is one of the important elements which is responsible for collecting the incoming RF signals of various frequencies. We present in this paper two efficient compact dual-band antennas for RF energy harvesters: a Printed-IFA for GSM bands with 1.3 dBi at 900 MHz band and 3.2 dBi at 1800 MHz band; and a quasi-Yagi for Wi-Fi bands with 5.7 dBi at 2.45 GHz band and 5.9 dBi at 5.3 GHz band. Also simulation and measurement results will be presented.
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