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EMI Shielding Terms

Anechoic Chamber – A room in which no acoustical reflections or echoes exist. The floor, walls and ceilings of these rooms are lined with a metallic substance to prevent the passage of electromagnetic waves.
 
Attenuation – An electrical signal’s reduction in concentration as the signal passes through media. Attenuation is measured in decibels.
 
Canted Coil – A round-wire spring with inclining (canted) elliptical coils that, when compressed, deflect independently. Whenever any part of the coil is deflected, the whole spring responds, allowing consistent loading at each point of contact.
 
CE Marking – A mandatory mark for about 70% of the products sold on the European Free Trade Association (EFTA) and European Union (EU) markets. CE Marking is sometimes called “CE Mark” and referred to as the “Trade Passport to Europe ” for non-EU products.
 
Double Shielded Enclosure – A shielded enclosure containing inner and outer walls isolated from one another, except at the point of filter penetration
 
Electromagnetic Compatibility (EMC) – The ability of electronic equipment to be operated without EMI.

Electrostatic Discharge (ESD) – The release of electrical energy usually caused by the shift of electrons from one object to another as the objects come into contact with and separate from one another. ESD is also known as triboelectric charge.

ESD Shielding – Shielding that prevents the failure of electronic equipment from interference associated with electrostatic discharge.

Emission – The release from electronic equipment of electromagnetic waves that have the potential to create EMI.
 
Filtering – The removal of certain unwanted signal components through attenuation while allowing the passage of the remaining signal components.
 
Impedance – The complete opposition offered by a circuit to the flow of current at a certain frequency that is a combination of resistance (R) and reactance (X). Impedance is measured in ohms; the quality of the conductor is better the lower the ohmic value.
 
Insertion Loss – Measurement reflecting filtering ability. Insertion loss represents the difference in power reception prior to and after the use of a filter.
 
Radiation – The movement of electromagnetic energy in the form of particles, rays or waves.
 
Radio Frequency – Low frequencies of electromagnetic radiation used for communications.
 
RFI (Radio Frequency Interference) – Interference in a specific frequency range used for radio communication. EMI and RFI are often used interchangeably; the term EMI/RFI shielding covers all interference caused by electromagnetic radiation.
 
Shielding Effectiveness – The ability of a shield component to prevent the passage of electromagnetic radiation. Shielding effectiveness is expressed as a ratio of electromagnetic signals with and without the shield component.
 
Skin Effect – The propensity of high frequency current to travel close to the outside of an electric conductor rather than through its cross section. At high frequencies, the effective resistance of a wire is increased by skin effect.
 
Slot Antenna – A radiating element that is created by a slot in the conducting surface or in a waveguide’s wall.
 
Vacuum Deposition – In a vacuum, the condensation of thin material coatings on cool surfaces.
 
Waveguide – Media that controls the passage of electromagnetic energy and signals.