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Near and far field
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====Reactive near field==== The interaction with the medium (e.g. body capacitance) can cause energy to deflect back to the source feeding the antenna, as occurs in the ''reactive'' near field. This zone is roughly within {{sfrac|1|6}} of a wavelength of the nearest antenna surface. The near field has been of increasing interest, particularly in the development of [[capacitive sensing]] technologies such as those used in the touchscreens of smart phones and tablet computers. Although the far field is the usual region of antenna function, certain devices that are called ''antennas'' but are specialized for [[near-field communication]] do exist. [[Electromagnetic induction|Magnetic induction]] as seen in a [[transformer]] can be seen as a very simple example of this type of near-field electromagnetic interaction. For example send / receive coils for [[Radio-frequency identification|RFID]], and emission coils for [[inductive charging|wireless charging]] and [[induction heating|inductive heating]]; however their technical classification as "antennas" is contentious.
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