Editing Electromagnetic shielding (section)

==Example of applications==
[[Image:Coaxial cable cutaway.svg|thumb|right|Cross-section through a coaxial cable showing shielding and other layers]]
One example is a [[shielded cable]], which has electromagnetic shielding in the form of a wire mesh surrounding an inner core conductor.  The shielding impedes the escape of any signal from the core conductor, and also prevents signals from being added to the core conductor.
Some cables have two separate [[coaxial]] screens, one connected at both ends, the other at one end only, to maximize shielding of both electromagnetic and electrostatic fields.

The door of a [[microwave oven]] has a screen built into the window. From the perspective of microwaves (with wavelengths of 12&nbsp;cm) this screen finishes a [[Faraday cage]] formed by the oven's metal housing.  Visible light, with wavelengths ranging between 400&nbsp;nm and 700&nbsp;nm, passes easily through the screen holes.

RF shielding is also used to prevent access to data stored on [[RFID]] chips embedded in various devices, such as [[biometric passports]].<ref>{{cite web|url=https://www.newscientist.com/article/dn8227-metal-shields-and-encryption-for-us-passports.html |title=Metal shields and encryption for US passports |publisher=Newscientist.com |access-date=18 November 2012}}</ref>

[[NATO]] specifies electromagnetic shielding for computers and keyboards to prevent passive monitoring of [[Computer keyboard|keyboard]] emissions that would allow passwords to be captured; consumer keyboards do not offer this protection primarily because of the prohibitive cost.<ref>{{Cite conference|url=https://www.usenix.org/legacy/event/sec09/tech/full_papers/vuagnoux.pdf|title=Compromising Electromagnetic Emanations of Wired and Wireless Keyboards|date=August 2009|first1=Martin|last1=Vuagnoux|first2=Sylvain|last2=Pasini|conference=18th [[USENIX Security Symposium]]}}</ref>

RF shielding is also used to protect medical and laboratory equipment to provide protection against interfering signals, including AM, FM, TV, emergency services, dispatch, pagers, ESMR, cellular, and PCS.  It can also be used to protect the equipment at the AM, FM or TV broadcast facilities.

Another example of the practical use of electromagnetic shielding would be defense applications. As technology improves, so does the susceptibility to various types of nefarious electromagnetic interference. The idea of encasing a cable inside a grounded conductive barrier can provide mitigation to these risks.