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Rectenna
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{{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=1376β1379 |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 MHz transmitter, flexible meshed antenna bent with a red LED light|A printed meshed rectenna lighting an LED from a Powercast 915 MHz transmitter]] ==Power beaming applications== The invention of the rectenna in the 1960s made long distance [[wireless power|wireless power transmission]] feasible. The rectenna was invented in 1964 and patented in 1969<ref>{{patent|US|3434678}} ''[https://patents.google.com/patent/US3434678 Microwave to DC Converter]'' William C. Brown, ''et al'', filed 5 May 1965, granted 25 March 1969</ref> by US electrical engineer [[William C. Brown]], who demonstrated it with a model helicopter powered by microwaves transmitted from the ground, received by an attached rectenna.<ref name="Brown">{{cite web |title=William C. Brown |work=Project #07-1726: Cutting the Cord |publisher=2007β2008 Internet Science & Technology Fair, Mainland High School |date=2012 |url=http://mainland.cctt.org/istf2008/brown.asp |access-date=2012-03-30}}</ref> Since the 1970s, one of the major motivations for rectenna research has been to develop a receiving antenna for proposed [[solar power satellite]]s, which would harvest energy from sunlight in space with [[solar cell]]s and beam it down to Earth as microwaves to huge rectenna arrays.<ref name="Torrey">{{cite journal |author-last=Torrey |author-first=Lee |title=A trap to harness the sun |journal=[[New Scientist]] |volume=87 |issue=1209 |pages=124β127 |date=1980-07-10 |url=https://books.google.com/books?id=vfQxekunC3QC&q=rectenna&pg=PA125 |issn=0262-4079 |access-date=2012-03-30}}</ref> A proposed military application is to power [[drone aircraft|drone]] [[reconnaissance aircraft]] with microwaves beamed from the ground, allowing them to stay aloft for long periods. [[File:Millimeter wave textile rectenna.jpg|thumb| A wearable millimeter-wave textile rectenna fabricated on a textile substrate for harvesting power in the 5G K-bands (20β26.5 GHz)]] In recent years, interest has turned to using rectennas as power sources for small wireless microelectronic devices. The largest current use of rectennas is in [[RFID]] tags, [[proximity card]]s and [[contactless smart card]]s, which contain an integrated circuit ([[integrated circuit|IC]]) which is powered by a small rectenna element. When the device is brought near an electronic reader unit, radio waves from the reader are received by the rectenna, powering up the IC, which transmits its data back to the reader. ==Radio frequency rectennas== The simplest [[crystal radio]] receiver, employing an [[antenna (radio)|antenna]] and a [[demodulation|demodulating]] [[diode]] ([[rectifier]]), is actually a rectenna, although it discards the [[DC bias|DC component]] before sending the signal to the [[headphones]]. People living near strong radio [[transmitter]]s would occasionally discover that with a long receiving antenna, they could get enough electric power to light a light bulb.<ref>{{cite web |url=http://web.physics.ucsb.edu/~lecturedemonstrations/Composer/Pages/76.09.html |title=76.09 β Radio transmitter lights antenna bulb}}</ref> However, this example uses only one antenna having a limited capture area. A rectenna array uses multiple antennas spread over a wide area to capture more energy. Researchers are experimenting with the use of rectennas to power sensors in remote areas and distributed networks of sensors, especially for [[Internet of things|IoT]] applications.<ref>{{cite news |title=Over to you: Mythical electricity? |url=https://www.telegraph.co.uk/scienceandtechnology/technology/3336114/Over-to-you-Mythical-electricity.html |archive-url=https://web.archive.org/web/20090628191010/http://www.telegraph.co.uk/scienceandtechnology/technology/3336114/Over-to-you-Mythical-electricity.html |url-status=dead |archive-date=2009-06-28 |date=2004-11-24 |access-date=2009-06-25 |publisher=[[The Daily Telegraph]]}}</ref> RF rectennas are used for several forms of [[wireless power transfer]]. In the microwave range, experimental devices have reached a power conversion efficiency of 85β90%.<ref>{{cite thesis |type=PhD Thesis |author-last=Zhang |author-first=J. |date=2000 |title=Rectennas for RF wireless energy harvesting |publisher=University of Liverpool |url=https://livrepository.liverpool.ac.uk/18537/}}</ref> The record conversion efficiency for a rectenna is 90.6% for 2.45 GHz,<ref name="McSpadden1998">McSpadden, J. O., Fan, L., and Kai Chang, "Design and Experiments of a High-Conversion-Efficiency 5.8-GHz Rectenna," ''IEEE Trans. Microwave Theory and Technique'', Vol. 46, No. 12, December 1998, pp. 2053β2060. https://ieeexplore.ieee.org/document/739282</ref> with lower efficiency of about 82% achieved at 5.82 GHz.<ref name="McSpadden1998"/> ==Optical rectennas== {{main|Optical rectenna}} In principle, similar devices, scaled down to the proportions used in [[nanotechnology]], can be used to convert [[light]] directly into electricity. This type of device is called an ''[[optical rectenna]]'' (or "nantenna").<ref>{{cite journal |author-first1=Asha |author-last1=Sharma |author-first2=Virendra |author-last2=Singh |author-first3=Thomas L. |author-last3=Bougher |author-first4=Baratunde A. |author-last4=Cola |date=2015-10-09 |url=https://zenodo.org/record/851685 |journal=Nature Nanotechnology |volume=10 |issue=12 |pages=1027β1032 |title=A carbon nanotube optical rectenna |doi=10.1038/nnano.2015.220 |pmid=26414198 |bibcode=2015NatNa..10.1027S}}</ref><ref> {{cite press release |date=2015-09-28 |title=First optical rectenna -- combined rectifier and antenna -- converts light to DC current |website=EurekAlert! |url=http://www.eurekalert.org/pub_releases/2015-09/giot-for092315.php}}</ref><ref>Patent application {{patent|WO|2014063149}} relates.</ref> Theoretically, high efficiencies can be maintained as the device shrinks, but to date efficiency has been limited, and so far there has not been convincing evidence that rectification has been achieved at optical frequencies. The [[University of Missouri]] previously reported on work to develop low-cost, high-efficiency optical-frequency rectennas.<ref>{{cite press release |url=http://munews.missouri.edu/news-releases/2011/0516-new-solar-technology-could-break-photovoltaic-limits/ |title=New solar technology could break photovoltaic limits |publisher=[[University of Missouri]] |date=2011-05-16}}</ref> Other prototype devices were investigated in a collaboration between the [[University of Connecticut]] and [[Penn State Altoona]] using a grant from the [[National Science Foundation]].<ref>{{cite press release |url=http://today.uconn.edu/blog/2013/02/uconn-professors-patented-technique-key-to-new-solar-power-technology/ |title=UConn Professor's Patented Technique Key to New Solar Power Technology |date=2013-02-04 |author-first=Colin |author-last=Poitras}}</ref> With the use of [[atomic layer deposition]] it has been suggested that conversion efficiencies of solar energy to electricity higher than 70% could eventually be achieved. The creation of successful optical rectenna technology has two major complicating factors: # Fabricating an antenna small enough to couple optical wavelengths. # Creating an ultra-fast diode capable of rectifying the high frequency oscillations, at frequency of ~500 THz. Below are a few examples of potential paths to creating diodes that would be fast enough to rectify optical and near-optical radiation. A promising path towards creating these ultrafast diodes has been in the form of "[[geometric diode]]s".<ref>{{Cite book |author-last=Zhu |author-first=Z. |title=Rectenna Solar Cells |publisher=Springer |date=2013 |location=New York, USA |pages=209β227}}</ref> Graphene geometric diodes have been reported to rectify [[terahertz radiation]].<ref>{{Cite journal |author-last1=Zhu |author-first1=Zixu |author-last2=Joshi |author-first2=Saumil |author-last3=Grover |author-first3=Sachit |author-last4=Moddel |author-first4=Garret |date=2013-04-15 |title=Graphene geometric diodes for terahertz rectennas |journal=Journal of Physics D: Applied Physics |volume=46 |issue=18 |pages=185101 |doi=10.1088/0022-3727/46/18/185101 |bibcode=2013JPhD...46r5101Z |s2cid=9573157 |issn=0022-3727}}</ref> In April 2020, geometric diodes were reported in [[silicon]] [[Nanowire|nanowires]].<ref>{{Cite journal |author-last1=Custer |author-first1=James P. |author-last2=Low |author-first2=Jeremy D. |author-last3=Hill |author-first3=David J. |author-last4=Teitsworth |author-first4=Taylor S. |author-last5=Christesen |author-first5=Joseph D. |author-last6=McKinney |author-first6=Collin J. |author-last7=McBride |author-first7=James R. |author-last8=Brooke |author-first8=Martin A. |author-last9=Warren |author-first9=Scott C. |author-last10=Cahoon |author-first10=James F. |date=2020-04-10 |title=Ratcheting quasi-ballistic electrons in silicon geometric diodes at room temperature |url=https://www.science.org/doi/10.1126/science.aay8663 |journal=Science |language=en |volume=368 |issue=6487 |pages=177β180 |doi=10.1126/science.aay8663 |issn=0036-8075 |pmid=32273466 |bibcode=2020Sci...368..177C |s2cid=215550903|url-access=subscription }}</ref> The wires were shown experimentally to rectify up to 40 GHz, that result was the limit of the instrument used, and the wires theoretically may be able to rectify signals in the terahertz region as well. == See also == * [[Microstrip antenna]] * [[Wireless power transfer]] ==References== {{reflist}} ==External links== * [https://web.archive.org/web/20090802101748/http://www.mtt.org/awards/WCB%27s%20distinguished%20career.htm William C. Brown's Distinguished Career] * {{cite journal |doi=10.1038/s41586-019-0892-1 |pmid=30692651 |title=Two-dimensional MoS2-enabled flexible rectenna for Wi-Fi-band wireless energy harvesting |journal=Nature |date=2019 |author-last1=Zhang |author-first1=Xu |author-last2=Grajal |author-first2=JesΓΊs |author-last3=Vazquez-Roy |author-first3=Jose Luis |author-last4=Radhakrishna |author-first4=Ujwal |author-last5=Wang |author-first5=Xiaoxue |author-last6=Chern |author-first6=Winston |author-last7=Zhou |author-first7=Lin |author-last8=Lin |author-first8=Yuxuan |author-last9=Shen |author-first9=Pin-Chun |author-last10=Ji |author-first10=Xiang |author-last11=Ling |author-first11=Xi |author-last12=Zubair |author-first12=Ahmad |author-last13=Zhang |author-first13=Yuhao |author-last14=Wang |author-first14=Han |author-last15=Dubey |author-first15=Madan |author-last16=Kong |author-first16=Jing |author-last17=Dresselhaus |author-first17=Mildred |author-link17=Mildred Dresselhaus |author-last18=Palacios |author-first18=TomΓ‘s |volume=566 |issue=7744 |pages=368β372 |bibcode=2019Natur.566..368Z |s2cid=59307657|url=https://oa.upm.es/79152/ }} ** {{cite press release |date=2019-01-28 |title=Converting Wi-Fi signals to electricity with new 2D materials |website=ScienceDaily |url=https://www.sciencedaily.com/releases/2019/01/190128111718.htm}} {{Commonscat}} {{Antenna Types}} [[Category:Radio frequency antenna types]] [[Category:Solar cells]] [[Category:Antennas]]
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