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In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference (EMI) sources based on near-field measurements is presented. The unintentional radiation of electronic devices and connecting cables can be measured by using two-point near-field planar scanning probes connected to the digital oscilloscope for ultra-wideband (UWB) time-domain data recording. The characterization...
The radiation from complex PCBs can be characterized through a statistical approach involving the field-field correlation. A two-probe measurement technique is developed to measure the stochastic electromagnetic (EM) emission from an Arduino Galileo board in an enclosure in the time domain at two different heights. The Wigner distribution function, which is a representation in phase space, is used...
In this work we present advances in measurements of noisy electromagnetic fields using two-probe scanning and correlation analysis. Correlation analysis provides a basis for accurate modeling of noisy electromagnetic fields and, hence, for advancing efforts in computer aided design to reduce electromagnetic interference. The amount of data required for the characterization of stochastic EM near fields...
In automotive radiated emission testing, as specified in CISPR 25, the absorber lined shielded enclosure (ALSE) method is commonly used. This requires an expensive chamber. Based on the observation that the dominating coupling is capacitive at frequencies below 30 MHz, the emission tests often suffer from low reproducibility. In order to predict emission in an alternative test method, a Huygens's...
The goal of this paper is to provide the reader with a good understanding on the effects of truncation (errors) in EMI Near-Field probe compensation techniques using Plane Wave Expansion (PWE). In this paper, the truncation error is analytically calculated for a single plane wave measured in the XY-plane. The influence of this error is calculated for the divergence of the electric field used in vector...
Diagnosing and resolving EMI compliance problems caused by fast transient signals can be difficult. This paper provides an overview of real-time spectrum analysis and discusses how this new technology can be used to solve these types of real-world EMI problems.
With the introduction of Fast Fourier Transform (FFT) EMI receivers, the time required to perform electromagnetic interference (EMI) measurements has been drastically reduced. In theory, these instruments allow measuring the whole band at once. However, aspects related to (i) the level and band of input interference, (ii) prescriptions in EMI normative (i.e., CISPR 16-1-1), and (iii) achievable performance...
This paper describes repeatability problem and uncertainty which occurs in radiated emission test according to EMC standard EN 55022 while Equipment Under Test (EUT) and Auxiliary Equipment (AE) are communicating by using High Definition Multimedia Interface (HDMI). Nowadays nearly all multimedia equipment has at least one HDMI port and this port is very sensitive in terms of EMC tests, especially...
This paper provides numerically calculated results of electric and magnetic currents on Huygens' surfaces in the vicinity of electrically small apertures. It is the aim to specify Huygens' surfaces in a way such that equivalent currents can be approximated by a tenth of a wavelength discretization with sufficient accuracy. This problem is investigated in the framework of the method of moments using...
The analytical expression for the discrete complex wave impedance (DCWI) in the 1-dimensional method of finite-difference time-domain (FDTD) grid is derived and correlated against numerical results from FDTD simulation. The DCWI for each grid (i.e., coarse main grid and fine sub-grid) is used as the characteristic impedance of the equivalent transmission line representing that grid. Subsequently,...
In this contribution a test setup is proposed which allows exciting and observing transient system responses within a nonlinearly loaded resonator. The test setup can also be modelled numerically, thus allowing to correlate measured and simulated system responses. As a main result it is observed that the presence of nonlinearities leads to an approximated rectification of the transient system responses.
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