Français
5. Notion of far field
The notion of radiation can be ambiguous. Radiation also refers to electrostatic or magnetostatic field lines. Here, we want to make a clear distinction between two types of electromagnetic fields: wave fields and evanescent fields. The former result from accelerating charges, the latter from static charges or constant currents. We'll now take a closer look at these essential EMC concepts.
5.1 Potentials
A system of fixed or moving charges generates scalar and vector potentials. Electric and magnetic dipole moments are characterized as, respectively, the product of the charge and the distance between charges, and the product of the current and the surface area covered by the current flow (figure
The Ultimate Scientific and Technical Reference
This article is included in
Electronics
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Notion of far field
Shielded cables and enclosures
Bibliography
Websites
Ibis Specifications of the different IBIS standards on http://www.eda.org/ibis/home/specs/specs.htm (page consulted on 10/28/10)
IEC specifications for various standards modeling components (IEC 62433 project), emission measurement methods (IEC 61967) and immunity (IEC 62132) on
Standards and norms
International Electrotechnical Commission IEC http://www.iec.ch/
- EMC IC modelling – Part 1: General modelling framework IEC 62 433-1 47A/840/DTS. - IEC 62433 - (2010)
- Integrated circuits – Measurement of electromagnetic emissions, 150 kHz to 1 GHz – Part 1: General conditions and definitions IEC 61967-1 - IEC 61967-1 - (2002-03) ...
The Ultimate Scientific and Technical Reference
