Editing Rectenna (section)

{{Short description|Antenna for receiving power}}
{{Use dmy dates|date=May 2022|cs1-dates=y}}
{{anchor|Filtenna}}
A '''rectenna''' ('''''rect''ifying ant''enna''''') is a special type of receiving [[antenna (electronics)|antenna]] that is used for converting [[electromagnetic]] energy into [[direct current]] (DC) [[electricity]]. They are used in [[wireless power transmission]] systems that transmit power by [[radio waves]]. A simple rectenna element consists of a [[dipole antenna]] with a [[diode]] connected across the dipole elements.  The diode [[rectifier|rectifies]] the [[alternating current|AC]] induced in the antenna by the microwaves, to produce DC power, which powers a load connected across the diode.   [[Schottky diode]]s are usually used because they have the lowest voltage drop and highest speed and therefore have the lowest power losses due to conduction and switching.<ref>{{cite book |doi=10.1109/MWSCAS.2017.8053188 |chapter=A dual-mode passive rectifier for wide-range input power flow |title=2017 IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS) |pages=1376–1379 |date=2017 |author-last1=Guler |author-first1=Ulkuhan |author-last2=Sendi |author-first2=Mohammad S. E. |author-last3=Ghovanloo |author-first3=Maysam |isbn=978-1-5090-6389-5 |s2cid=31003912}}</ref> Large rectennas consist of arrays of many power receiving elements such as dipole antennas.

[[File:Meshed1GHzPrintedRectenna.jpg|thumb|right|alt=A printed rectenna lighting an LED from a Powercast 915&nbsp;MHz transmitter, flexible meshed antenna bent with a red LED light|A printed meshed rectenna lighting an LED from a Powercast 915&nbsp;MHz transmitter]]