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For the system electromagnetic susceptibility or risk assessment, the electromagnetic norms of the field-line coupling currents are taken as the stresses on the electric interfaces. In order to obtain the statistical property of stresses, the factors in field-line coupling model is treated as the random variables. However, if every parameter were sampled, the computation will be heavily burdened and...
Modern radar and communication systems used in ground and naval defense platforms can generate high-intensity electromagnetic field. This high-intensity electric field levels may be hazardous to both personnel and ordnance. Sensitive circuits inside the ordnance may be damaged and also, electrically initiated devices can be activated unintentionally. Thus, ordnance should be immune against high level...
This paper presents an experimental validation of a statistical model of the response of a wire in a reverberant chamber. The statistical model is based on an approach known as Statistical Energy Analysis (SEA); the need to solve Maxwell's equations within the cavity is avoided by employing a relation known as the “diffuse field reciprocity principle”, which leads directly to an expression for the...
This report studies the influence of printed circuit board (PCB) design on voltage overshoot and ringing oscillation in switching operation of gallium nitride gate injection transistor (GaN-GIT) for high-frequency DC-DC converter. The parasitic inductances in the main power loop have been identified based on moment of method (MoM) analysis and frequency characteristics of impedance measured with 2-port...
A folded rhombic antenna as a broadband antenna for measuring an electromagnetic interference (EMI) was designed so that its dimensions were reduced as 1/4 smaller than the original antenna. Three prototype antennas were built, and the complex antenna factors of their antennas were measured by the 3-antenna method. As a result, it was found that a usable frequency range of the prototype antennas is...
This paper presents an electromagnetic analysis based on an innovative simulation environment and a spherical near field facility well suited to evaluate the near field generated by wireless BAN communication technologies close to an anthropomorphic human mannequin. The interest is to demonstrate the main advantages of these new electromagnetic tools in the theoretical and experimental domains.
The present paper deals with the development of a detailed identification method based on the frequency response of an induction machine in high frequency, the transfer function are used to represent a mathematical model of AC motor impedance. The proposed model of AC motor impedance is suitable for prediction and analysis the Electromagnetic Interference (EMI) problems in adjustable speed driver...
These days, passengers can use their portable electronic devices (PEDs) in more and more aircraft. Even in those aircraft, where less than 5 years ago this was strictly forbidden. It is safe to say, that with respect to EMC neither the aircraft nor the portable devices have changed much in the last 5 years. So why can authorities and industry now accept, what was inacceptable for such a long time?...
This contribution discusses the synthesis of EMC-test signals with arbitrary waveform generators and software-defined radio. Hardware and software requirements are addressed categorising the test signals into two classes: narrowband modulated signals of long duration and broadband transient signals. Corresponding synthesis and measurement examples are presented for multipath propagation and navigation...
The paper presents a study on the electromagnetic behavior of aircraft composite when lightning strikes on an aircraft. As the lightning phenomenon and its direct effect are very complex, the intrinsic electric characteristics of composite material are thus needed to be understood for lightning strike protection. Effective medium method is employed to model carbon fiber composite. By using an example,...
Free-space radiowave propagation model, used in short-range EMC system analysis, is inadequate for the reactive near-field zone in the radiating source vicinity. It results in errors when the electromagnetic background intensity is being analyzed in cases with high terrestrial density of mobile transmitters, capable to be found nearer to an observation point at ranges, comparable with radius of this...
A mathematical model of a. c. traction power supply system had been improved. It can be stated as a scientific base for the measurement method of harmonics of the return traction current. The track circuits work in the worst conditions situated near traction substations and locomotives, because the current of harmonics interferences will be greatest. It was established by the results of modeling and...
In this paper, the measurement frequency band was extended from 1.0 to 2.0 GHz in the method of measuring the dielectric properties in liquids based on comparison with reference materials. For that purpose, the interpolation formula was expanded to 11 points based on a combination of the method previously proposed by the author. In this case, a comparative expression to the reference material was...
In this paper, we present the experience and process of Electromagnetic Environmental Effect (E3) on the airworthiness certification for the performance improvement aircraft. After introducing the purpose and definition of this project, we explain the different E3 improvement items for airworthiness between new development and improvement aircraft. And we also explain the method of the tailoring of...
The designing of instruments aimed to measure electromagnetic interference (EMI) is particularly challenging. The most critical aspect is the high dynamic range, which is required to avoid overload conditions and thus to guarantee reliable measurements. Unfortunately, also adhering to today's standards (i.e., CISPR 16-1-1) is not sufficient to avert overload phenomena. With three simple experiments,...
This paper deals with EMC testing studies conducted on Sensor devices — accelerometer/inertial sensors. Immunity and Emission performances are carried out to ensure the compliance with market needs. We describe the steps with improvement of PCB layout leading to high immunity level of the system. The paper demonstrates how the PCB layout can contribute to the EMC performance of an application based...
It is important when considering the shielding effectiveness (SE) of an enclosure to take into account any contents the enclosure may have. Contents such as printed circuit boards (PCBs) will absorb electromagnetic energy and so affect the SE of the enclosure. Previously, it has been shown that the absorption cross section (ACS) of PCBs and the transmission cross section of apertures can be used in...
This paper discusses the results of a study the authors conducted to clarify the usability of an absorber-lined shielded environment (ALSE) as a 150 kHz and lower frequency magnetic field measurement environment using the mirror image method. The magnetic field strength at a measurement point obtained from the mirror image method almost agreed with the measured value and the value obtained by a 3D...
Shields generally solve EMC problems due to their high efficiency. When it comes to an electrical automotive drive system, the relatively small quantities of a non ideal shield are of importance due to the high level of emissions generated which face very stringent requirements for low level emissions. As a consequence, the shield and ground loop currents are decisive for various EMC conducted and...
This paper presents the implications of the new low frequency radiated emission requirements and how they have been stated for the Solar Orbiter mission so the impact in the design, verification and testing process for the Antenna Pointing Subsystem for the Solar Orbiter and future space missions. The control of Low Frequency Radiated Emission (E-field and H-field) is getting more importance in the...
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