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The electromagnetic immunity of an operational amplifier in the non-inverting configuration is characterized using the direct power injection (DPI) standard. The amplifier is driven by the functional input signal and the radio-frequency (RF) disturbance signal that is injected into the output pin. The output reflection coefficient in the large-signal conditions is calculated from the time-domain simulations...
Frequency-selective exposimeters were used to evaluate stationary and mobile components of exposure to radiofrequency electromagnetic radiation in the public accessible environment, with respect to the location in the urban area and intensity of mobile communication traffic. It was found that in the crowded public space the uplink mobile component of exposure and wide-band internet access may be at...
High switching frequencies(>1 MHz) become available due to the development of wide bandgap semiconductors. This trend of increasing operating frequency in power electronics results in the reduction of output filter sizes and costs. As frequency increases, parasitic behavior of components become more dominant. This paper shows the possibility to shift the generated EMI peaks to the most effective...
A Model dedicated to EMI prediction in a DC-DC converter is presented in this paper. The model is analytical to be used by a deterministic optimization algorithm. This model not only predicts EMI but also thermal effects of the converter. Numerical and experimental validation of the model are performed regarding EMC aspects and perspectives for the final optimization purpose are presented.
Numerical FDTD full-wave simulations are performed in order to evaluate the behavior of a chaotic reverberation chamber. Performances are evaluated in terms of uncorrelated frequencies and antenna positions by using a correlation-based multivariate approach. The chaotic cavity geometry is obtained by including spherical diffractors inside the chamber. It is demonstrated that wall deformations enhance...
This paper describes the results of a Monte Carlo simulation to quantify the statistical uncertainty of emission measurements in the scope of electromagnetic compatibility in a reverberation chamber. Such a measurement can be performed based on the average or maximum received power at the reference antenna. Depending on whether value is measured, different parameters as the chamber validation factor...
Cross-correlation analysis of the cyclostationary near-field unintentional radiations from the printed circuit boards (PCB) can be used for the localization of the transmission line paths transferring the deliberately programmed pseudorandom sequences. The unintentional radiations are formed by induced surface currents on the surface of the PCB and can be measured by the near-field magnetic probes...
This paper presents a calibration method allowing to quantify the quality of the electromagnetic field generated in a reverberation chamber. The method requires only to measure the reflection coefficient of an antenna (i.e. S11) for different stirring conditions (i.e. different positions of a mode stirrer for a mechanically stirred chamber). The proposed method requiring a simple measurement setup...
The trend of integration is continuously increasing in order to reach higher power densities. One promising way is the monolithic integration of RC snubber circuits into power semiconductors. This work describes a new way of monolithic integration of an RC snubber in the power semiconductor to improve electromagnetic interference (EMI). The snubber circuit is built of additional trenches next to the...
A novel algorithm for the iterative geometric optimization of EMI filters is presented. The two step approach of an equivalent electric circuit extraction, followed by a sensitivity analysis in the circuit as well as the 3D model domain drives the shape optimization. This allows for a deeper insight into coupling paths and their cause in the model, and their effect in the circuit domain. The concept...
Undesired EM radiation generated by wired systems using a PLC transmission, for example, can be a source of EM pollution and bring an annoying problem of electromagnetic compatibility. The evaluation of these near-field radiation is therefore of interest. In this paper, we propose a simplified approach of electromagnetic fields in order to adequately estimate the EM radiation emitted by the wired...
Nowadays, the 2–150 kHz frequency range represented as an unregulated range from the electromagnetic compatibility standardization point of view. Immunity and emission limits are not defined except some product standards, thus ensuring electromagnetic compatibility is a very hard task. The appropriate committees are working on the problem, but it requires more information to make right decisions....
This paper presents a theoretical model for the characterization of complex flexible printed interconnects. The main aim of this work is to extract, from the multi-layers complex structure subject to harsh environment (high intensity electromagnetic fields), an equivalent circuit model from 500 MHz to 8 GHz. The proposed methodology requires assessing the voltages induced at the end of the signal...
This paper presents 3D electromagnetic modelling of surface mount (SM) capacitors and the mutual couplings between them. 3D electromagnetic modelling software CST MWS is used for this purpose. Various SM multi-layer ceramic capacitor models are proposed and modelled. The modelling results are then verified experimentally. Comparison of the modelling and experimental results in terms of transmission...
This paper presents an entirely analytical formula to determine the electromagnetic field inside a lossy rectangular box containing apertures on its front face. On the basis of circuit model theory we derived an extremely fast technique to include conductor losses into the model. A surface impedance boundary condition is introduced to deal with lossy conductive walls of the cavity. The model takes...
The Square Kilometre Array (SKA) and its precursor instruments such as MeerKAT are new generation radio telescopes whose high sensitivity increases their susceptibility to radio frequency interference (RFI). Efforts in South Africa thus continue to be centred around preserving the electromagnetic (EM) quietness of the MeerKAT site. An understanding of the EM characteristics of the site can be gained...
This paper presents an analytical method to determine the electric field inside an enclosure with an aperture from a thin wire as an efficient source outside the enclosure. In this regard, the wire is divided into multiple segments as discrete plane wave (far-field) sources. These sources radiate and excite the enclosure through the aperture which can be modeled by Robinson's formulation. Finally...
Now voltage sources are widely used for differential signaling. However, a common mode current is excited in unbalance differential transmission line. In this paper, common-mode excitation by differential current sources is compared with that by differential voltage sources in the unbalanced differential transmission line. A equivalent circuit describing the differential transmission line are used...
To date, remote metering devices (electricity, gas, water and heat) operating in the 800 MHz band (862–869 MHz) are used either by IoT providers or by metering service providers to determine the energy etc. consumption in private houses from the outside without the need to enter the building. Meters can be integrating as simple LoRaWAN device transmitters connected to a central database by base stations...
To simulate the electromagnetic emission of an electronic system, also the behavior of the measurement instrument, an Electromagnetic Interference (EMI) receiver, needs to be emulated. This requires not only computation capability, but also the processing time is proportional to the length of the time domain input signal. As an alternative, this work investigates the usability of a convolution in...
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