222 resources related to Em Shielding
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The Pulsed Power Conference is held on a biannual basis and serves as the principal forum forthe exchange of information on pulsed power technology and engineering.
This symposium pertains to the field of electromagnetic compatibility.
ECTC is the premier international conference sponsored by the IEEE Components, Packaging and Manufacturing Society. ECTC paper comprise a wide spectrum of topics, including 3D packaging, electronic components, materials, assembly, interconnections, device and system packaging, optoelectronics, reliability, and simulation.
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
APEC focuses on the practical and applied aspects of the power electronics business. Not just a power designer’s conference, APEC has something of interest for anyone involved in power electronics including:- Equipment OEMs that use power supplies and converters in their equipment- Designers of power supplies, dc-dc converters, motor drives, uninterruptable power supplies, inverters and any other power electronic circuits, equipments and systems- Manufacturers and suppliers of components and assemblies used in power electronics- Manufacturing, quality and test engineers involved with power electronics equipment- Marketing, sales and anyone involved in the business of power electronic- Compliance engineers testing and qualifying power electronics equipment or equipment that uses power electronics
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Component parts, hybrid microelectronics, materials, packaging techniques, and manufacturing technology.
2007 Asia-Pacific Microwave Conference, 2007
In this paper, the realization of EM shielding concrete block is achieved using 3-D parallel resonator. The conventional 2-D resonator structure has degeneration of shielding characteristic by cross polarization effect. The proposed 3-D resonator is designed for reduction of cross polarization effect. The proposed 3-D resonator consists of 2-D parallel resonators on X,Y and Z axis. The 2-D parallel resonator ...
2010 Asia-Pacific International Symposium on Electromagnetic Compatibility, 2010
Here we present an efficient method for evaluating the EM shielding effectiveness of a commercial building to determine approximately the amount of shielding available before beginning a “hardening” program. A traditional approach is to use a transmitter/antenna matched to an antenna/receiver. In that standard approach the setup is calibrated in an open area outside, with a set separation distance. Then ...
Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620), 2002
Thermoset polymer composite materials are finding a wide range of applications in aerospace structural parts, due to many advantageous features. The most important feature is the reduction in weight of the structure compared to other alternatives. Majority of the material systems of this class with the exception of carbon fiber based composites, are also transparent to EM radiation. There are ...
2017 IEEE 5th International Symposium on Electromagnetic Compatibility (EMC-Beijing), 2017
Lightning strike is a kind of threaten to the flying helicopter. The electromagnetic (EM) field, produced by the lightning attack, induces over voltage and current on the onboard cable bundles which result in disturbing or damaging of the sophisticated electronic and electrical equipment and seriously imperil flight safety. To obtain the distribution of internal magnetic field, we set an imitative ...
2009 International Symposium on Electromagnetic Compatibility - EMC Europe, 2009
This paper describes a technological approach for the realization of frequency selective shielding coatings characterized by high optical transmittance in the infrared region. The adopted method consists in sputtering a multilayer thin film and afterwards patterning the obtained coating by laser ablation. The geometry of the desired pattern was designed to improve the optical performances without losing the radio frequency ...
Surgical Robotics: da Vinci and beyond
IMS 2011 Microapps - Yield Analysis During EM Simulation
Life Through the Eyes of a Machine
MicroApps: Microwave Journal Panel Session - Path to 5G -Design and Test Challenges for the Future
IMS 2011 Microapps - Practical Methods for Estimating the Q of Spiral Inductors Using EM Planar Simulators
Penetrating Conductors - EMC Society Demo
I Change the World. I am an Engineer.
Grounding for Hybrid Vehicles
Micro-Apps 2013: EM Simulation Tools in Evolution within Circuit Design
GeoOrbital E-Wheel Allows Effortless Biking
IMS 2012 Microapps - Fully Integrating 3D Electromagnetic (EM) Simulation into Circuit Simulation
Intro - The Other Women of ENIAC: Rethinking IT Innovation
Standards and the Internet: Exploring Open Standards, Part 1
Standards and Innovation: Exploring Open Standards, Part 2
Detecting an Exoplanet With a DSLR
IEEE Xplore: Search vs. Research
IMS2013 Micro-Apps 2013: Parallel Processing Options for EM Simulation
Inspiring Brilliance: The impact of control theory and cybernetics of Maxwell's paper: On governors
Standards Ideology: Exploring Open Standards, Part 3
In this paper, the realization of EM shielding concrete block is achieved using 3-D parallel resonator. The conventional 2-D resonator structure has degeneration of shielding characteristic by cross polarization effect. The proposed 3-D resonator is designed for reduction of cross polarization effect. The proposed 3-D resonator consists of 2-D parallel resonators on X,Y and Z axis. The 2-D parallel resonator consists of two plates and one via. The optimized mixture ratio, which means total concrete volume to total resonator volume, is 36.21 to 1. In case of the mixture ratio of 36.21 to 1, the measured resonance frequency of concrete block with 2-D resonator is 2.152GHz. The stop band width (les -20dB) is 270MHz. At the mixture ratio of 36.21 to 1, the resonance frequency of concrete block with 3-D resonator is 1.806GHz, which is lowered than concrete block with 2-D resonator, due to coupling among plates of resonators. The stop bandwidth of 3-D resonator (les -20dB) is 250MHz. The proposed concrete block structure can be applied to building construction for EM shielding effects.
Here we present an efficient method for evaluating the EM shielding effectiveness of a commercial building to determine approximately the amount of shielding available before beginning a “hardening” program. A traditional approach is to use a transmitter/antenna matched to an antenna/receiver. In that standard approach the setup is calibrated in an open area outside, with a set separation distance. Then the same setup is used, but with the antenna/receiver moved into the building - with shielding effectiveness determined by the reduction in the received field, as provided by the building structure. However, done properly, this approach can be expensive, time consuming, and may present some logistical problems. To address these problems, we present a much simpler alternative approach. For this method only the internal antenna/receiver part of the setup is used. The external source is replaced by using existing external RF sources, such as AM and FM radio transmission, and signals from cellular phone towers. This approach also accounts for the fact that at lower frequencies (~1 MHz) the shielding effectiveness differs for electric and magnetic fields. After discussing this approach, we then present a test in which this method and the traditional approach are used on a building, and the results compared. All approaches have strengths and weaknesses - this method produces reasonable results with greatly reduced effort. It is especially useful in that there is no need to procure the right to illuminate the building and to gain access to all required transmitter sites all around the building.
Thermoset polymer composite materials are finding a wide range of applications in aerospace structural parts, due to many advantageous features. The most important feature is the reduction in weight of the structure compared to other alternatives. Majority of the material systems of this class with the exception of carbon fiber based composites, are also transparent to EM radiation. There are applications where such structural composites should not transmit EM radiation while retaining the weight advantage. The present study investigates the effect of the inclusion of a metallic (Al, Cu) foil, metallized fabric on the EM transparency of such composite material systems. Sample laminated plates following the above scheme were subjected to shielding effectiveness test using EMI/EMC test facilities in accordance with MIL STD 285. Results have indicated effective EM shielding in the frequency range of 20 MHz to 10,000 MHz when metallized fabric, Cu foil and Al foil were used in that order.
Lightning strike is a kind of threaten to the flying helicopter. The electromagnetic (EM) field, produced by the lightning attack, induces over voltage and current on the onboard cable bundles which result in disturbing or damaging of the sophisticated electronic and electrical equipment and seriously imperil flight safety. To obtain the distribution of internal magnetic field, we set an imitative UH-1H 3D model to conduct a simulation of impulse current injection in this paper. According to the simulation results, we establish a simple model of a new shielding material called BLW to get material property of the electromagnetic shielding effectiveness by means of the plane wave irradiation method. Besides, the material is used for the windshield in the entire helicopter model to simulate the comprehensive shielding effectiveness.
This paper describes a technological approach for the realization of frequency selective shielding coatings characterized by high optical transmittance in the infrared region. The adopted method consists in sputtering a multilayer thin film and afterwards patterning the obtained coating by laser ablation. The geometry of the desired pattern was designed to improve the optical performances without losing the radio frequency shielding properties. The results of the characterization performed on a laboratory-scale prototype coating are presented.
A set of innovative nonmetallic materials having EM (electromagnetic) shielding properties has been selected. Available data on shielding effectiveness of nonmetallic materials are incomplete and not easily comparable. Therefore, a common testing methodology has been chosen based on a double TEM (transverse electromagnetic) cell, in order to obtain comparable and repeatable data. The measurement set-up is easily reproducible and does not affect the results. A large number of specimens, have been tested. The effects on shielding effectiveness due to aging and environmental stresses (temperature, humidity, salt fog, etc.) have been evaluated through a comparison of experimental results. It was found that environmental stresses have a significant effect on the shielding effectiveness of composite materials.<<ETX>>
Technical textile materials can be successfully used also as a protection against external electromagnetic field. There are available technologies to improve the material surface - with use of different (galvanize, plate, etc.) technologies. The paper deals with woven textiles - compound of cotton, polyester and conductive fibers. The paper presents the impact of electromagnetic field on special woven textile materials and describes the shielding principles. The measurement technique used at FEL CTU in Prague is also described and the base measuring technologies are discussed. Nevertheless, the major part of the paper is dedicated to experience of authors with numerical (FE) modeling of shielding textiles and to description of designed and used methodology of FE model evaluation. The numerical results are compared to measurement and to mathematical (Matlab) model results.
Electromagnetic shielding is the technique that reduces and prevents coupling of undesired radiated electromagnetic energy into equipment, so as to enable it to operate compatibly in its electromagnetic environment. Usually, the frequency considered for electromagnetic shielding design is above 10 kHz, but the lower frequency for some special demand is 50 Hz or even 0.01 Hz sometimes. This paper mainly studies the shielding design for low-frequency magnetic field, and the shielding effectiveness of single shielding and multimedia shielding are discussed separately. Moreover, the shielding effectiveness of a steel shielding enclosure and two different shielding doors for low-frequency magnetic fields in the near zone is measured.
In this paper, 3-D MTM structure using one via and two rectangular plates is proposed in order to design of EM shield functional concrete blocks at 2GHz- band.
Parylene is a conformal polymer film that has been used as a protective conformal coating for more than 25 years. It provides environmental and dielectric isolation in a variety of applications, industrial and automotive sensors, electronic circuits, hybrids, various medical substrates, and is also used extensively for corrosion protection and electrical insulation of ferrites and magnets. The most important performance specifications for a conformal coating are (1) uniformity and completeness of coverage, and (2) physical, electrical, chemical, mechanical, and barrier properties. Parylene offers significant performance capabilities in both of these areas. As a nonsolvent based coating, parylene is not affected by volatile organic compound (VOC) restrictions, and it is not implicated in the ozone depletion concerns of the Montreal Protocol and other environmental legislation. The parylene vacuum condensation process is now also capable of producing a dissipative parylene 'C-shield' that allows packaging of microelectronics with both the environmental protection offered by parylene and the dissipation of undesired stray EM radiation. This eliminates encapsulation with metal boxes and allows major cost and weight savings.
The scope of this guide is to provide manufacturers of gaskets and designers of electronic systems appropriate methods for the characterization of gaskets. This document will guide the user in the selection of the appropriate test method in order to determine the level of shielding provided in the intended application.
This document describes equipment inspection and radio frequency (rf) electromagnetic field measurement procedures for evaluation of rf industrial, scientific, and medical (ISM) equipment installed in the user's facility. The term, ﾓISM equipment,ﾔ as used here, includes equipment that generates rf energy for purposes other than radio communications, to cause physical, chemical, or biological changes; for example, industrial heaters (dielectric and ...
This standard provides uniform measurement procedures for determining the effectiveness of electromagnetic (EM) shielding enclosures at frequencies from 9 kHz to 18 GHz (extendable down to 50 Hz and up to 100 GHz). The owner of the shielding enclosure shall provide the frequencies at which the shield will be tested, and the shielding effectiveness (SE) limits for pass/fail. This standard ...