The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This contribution deals with the analysis of the Transmission-Line Holder measurement system for determination of shielding effectiveness for material samples. Two different material sample configurations will be analysed, material sample with conductive and non conductive surface. In this part, the TLH with capacitive and galvanic coupling will be analysed. This TLH is called TEM-2000. Analysis will...
Power supply noise has been becoming critical in advanced CMOS digital systems, because power supply noise induces false logic operation and instability. Especially, anti-resonance peaks in power distribution network (PDN) due to the chip-package interaction induce the unwanted power supply fluctuation. In this paper, power supply noises and total impedances of power distribution network (PDN) for...
According to the Frequency Allocation Table, in the frequency range 10.7–11.7 GHz, on the surface of the Earth, only Fixed Services (FS) of the Point to Point type can operate. This frequency range has been also used, for a long time, by Satellite Broadcasting (BSS). Here, the satellite TV emission is present of the analog standard (at rather small contribution now) and also of the DVB-S and DVB-S2...
A high performance shield structure which will prevent the leakage of intermediate frequency magnetic fields from equipment generating strong magnetic fields in this frequency range is desired. In this paper, a shield structure including a joint is considered because practical shield enclosure and shield room have joint to facilitate construction. A conventional shield rooms do not have high shielding...
A Tactical Data Link Communication System (TDLCS) simulation model is proposed with the help of the software of Simulink/Matlab, based on direct-sequence spread spectrum (DSSS), frequency-hopping spread spectrum (FHSS) and channel coding technologies. Further, such simulation model is adopted for evaluating anti-interference performance of the TDLCS for various electromagnetic interference (EMI) signals.
The radiation of complex sources in either free-space or reflecting environments is described through a statistical approach involving the field-field correlation function. A representation in phase-space, the Wigner distribution function, is used to unveil the wave mechanics of waves propagated in the near-and far-fields. An evolution operator for these Wigner functions is derived and approximation...
An analytical model is proposed to fully characterize the modal structure of 3D metamaterial cavities which can be used to improve the properties of reverberation chambers. The metamaterials are modelled by a complex reflection coefficient. We discuss the valid ranges of indices of the resonant frequencies as function of the phase of reflection coefficients. A set of rules for counting the number...
High frequency is one of the main trends of development in power electronics, which will lead to the problems of the electromagnetic interference. The key to improve this phenomenon is EMI filter. In order to increase the power density, a kind of high permittivity material (CCTO) is proposed in this paper. Then, based on this material, we proposed a new connection approach, and applying it to the...
In this work the feasibility study of a medical equipment based on electromagnetic technology for breathing detection is presented; this system was designed to detect a victim buried from a landslide through the sensing of the thorax displacements due to breathing activity. The system was preliminary tested into a controlled environment and subsequently in a real scenario (a road construction site)...
Bit-error probability (BEP) of a digital communication system subjected to interference can be approximately derived from the amplitude probability distribution (APD) of the interfering signal. In this paper, it is pointed out that the approximation underestimates maximum BEP of a multilevel modulation scheme when the interference is impulsive, which is undesirable in regard to setting emission limits...
A hybrid representation of the Green's function of the rectangular cavity is presented in this work. When the observation point is near the source point, the Ewald representation of the cavity Green's function is employed. When the observation and the source point are well separated, a two-dimensional (2D) spectral representation is used. Results show that the hybrid approach combines the advantages...
In the literature, often the proposed modeling of electromagnetic transients of power network is mainly based on the numerical solution of full-wave Maxwell's equations. The solutions are usually very rigorous, but can be computationally intensive and difficult to use even by a research engineer. The aim of this proposed work is to show that it is possible to treat the same applications using simplified...
The Marquardt least-squares method is applied in this paper for estimation of the Pulse function's non-linear parameters in order to approximate measured lightning currents. Such procedure is generalized so it could be used for other pulse functions representing lightning current waveshapes. The obtained results show that this method provides good results for the IEC 62305-1 standard lightning current...
Testing with pulsed signals in reverberation chambers has the advantage of a lower input-power necessary to reach the desired test field-strength. On the other hand larger chambers with a high quality factor Q have a large time-constant. That means that the build-up of the electrical field inside a chamber takes a long time (up to several µs). This can become a problem when testing with 3 µs-pulses...
The downlink transmission power of a 4G-LTE base station is quantified by means of statistical counters. They are build up analyzing the physical resource blocks allocated during transmission at different data throughputs. The analysis is performed during complete over the air tests carried out inside a reverberation chamber. The reverberation chamber allows to vary dynamic fading conditions by changing...
In this work, we show some characteristics than enable the efficient and accurate estimation of High-Intensity Radiated Fields transfer functions in complex environments by a leap-frog discontinuous Galerkin method. The conformal truncation of the computational domain, and the selection of different order of the basis functions combined with a local time-stepping technique, permits the computation...
Various types of power converters including Voltage Source Converters (VSCs) have been known to produce conducted emissions. The net effect of simultaneously operating multiple VSCs is non-linear and this makes the prediction of the emission level more difficult. This paper presents an efficient method that can be used to predict conducted emissions of multiple VSCs in the presence of various uncertainties...
This paper describes an efficient evaluation of a spherical wave based generalized scattering matrix formulation for electronic subsystems (Printed Circuit Boards, ICs, small antennas,…). This generalized S-matrix consists of four subparts: the classical scattering matrix of the modes at the circuit ports, an array describing the outward traveling modes at the radiation ports, an array describing...
This paper deals with the emissions induced by a power converter. The final aim is to achieve an optimal design of a power converter printed circuit board (PCB) in the early stage of simulation. This study is focused on a well known Buck converter which operates at a frequency around 1MHz. The load loop was performed of exaggerated dimensions to highlight the problem of radiation and to allow an analysis...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.