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In this paper, a miniaturized self-actuated bandpass protection structure with filtering and limiting functions is presented. Based on energy low-pass mechanism, this protection structure is sensitive to the power density or field intensity of incident wave. The unit cell dimensions and periodicities are sub-wavelength which is in the order of λ/15. Mechanism of operation, structural design, and full-wave...
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...
Conducted emission of motors is a domain of interest for EMC as it may introduce disturbances in the system in which they are integrated. Nevertheless few publications deal with the susceptibility of motors, and especially, servomotors despite this devices are more and more used in automated production lines as well as for robotics. Recent papers have been released devoted to the possibility of compromising...
Today's application of batteries in transportation systems and portable devices as part of the electric board makes it susceptible to electromagnetic interferences. Implemented inverters and DC-DC-converters in such systems generate disturbances at switching frequencies and their harmonics, which can be led into the battery system. For this reason it is important to determine the input impedance of...
In this paper, a modeling method for predicting the conducted emission with a current probe method is presented for a motor-drive braking system. The proposed model considers the motor driving circuit components and the measurement environment. The models of motor driving circuit component include PWM inverter circuits, 3-phase motor, PCB, heatsink, bus bars, and motor casing. The models of measurement...
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...
A new structure conducted disturbance measurement system is designed and prototyped in order to improve the impedance characteristic of the previously proposed measurement system. This new-type measurement system adopts a designed equipment under test (EuT) connection which is used to propagate conducted disturbance and connect the AC plug of the EUT and the measurement system. The EUT connection...
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...
This paper presents the modeling and design of a source-buffered Miller operational amplifier structure that is highly immune to electromagnetic interference (EMI). The source-buffered Miller operational amplifier is designed and fabricated in the 0.18 μm mixed-mode CMOS process and modeled mathematically including the body effect and channel length modulation. Measurement results show that the maximum...
A system's phase center (PC) is an equivalent point behaving like an ideal, isotropic radiator from which spherical waves emanate. Ideally, the phase on a spherical surface in the far field of this point is constant. Determining the PC of an antenna system is a very challenging task important for many different applications like electromagnetic compatibility (EMC) testing, GPS or radar navigation...
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...
A conducted disturbance measuring apparatus using two TEM cells needs a jig which connects an AC plug of an EUT to coaxial connector of the TEM cell. We designed the low loss jig for improving the voltage division factor (VDF) of the apparatus. In this paper, the VDF with the designed jig is evaluated. As a result, the VDF is improved maximum 20 dB compared with that by using the conventional one,...
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...
A novel miniaturized frequency selective rasorber (FSR) with tunable passband is proposed. The unit cell dimension of designed structure is miniaturized to λ0/30. Miniaturization of the FSR unit cell is achieved by using convoluted elements, introducing varactors, and adopting nonresonant elements. The property of tunable passband is obtained from the variable capacitance of loaded varactors. The...
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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