Editing Phased array (section)

=== Space probe communication ===
The ''[[MESSENGER]]'' spacecraft was a [[space probe]] mission to the planet [[Mercury (planet)|Mercury]] (2011–2015<ref name=nyt20150430>{{cite news |last=Corum |first=Jonathan |title=Messenger's Collision Course With Mercury |url=https://www.nytimes.com/interactive/2015/04/30/science/space/messenger-collides-with-mercury.html |date=April 30, 2015 |work=[[New York Times]] |access-date=10 May 2015 |url-status=live |archive-url=https://web.archive.org/web/20150510040355/http://www.nytimes.com/interactive/2015/04/30/science/space/messenger-collides-with-mercury.html |archive-date=10 May 2015 }}</ref>). This was the first deep-space mission to use a phased-array antenna for [[telecommunications|communications]]. The radiating elements are [[circular polarization|circularly-polarized]], slotted [[waveguide]]s. The antenna, which uses the [[X band]], used 26 radiative elements and can [[Fault tolerance|gracefully degrade]].<ref>{{cite web|url=http://messenger.jhuapl.edu/the_mission/publications/Wallis_Cheng.2001.pdf |title=Phased-Array Antenna System for the MESSENGER Deep Space Mission |last1=Wallis |first1=Robert E. |last2=Cheng |first2=Sheng |publisher=[[Johns Hopkins University Applied Physics Laboratory]] |access-date=11 May 2015 |archive-url=https://web.archive.org/web/20150518091704/http://messenger.jhuapl.edu/the_mission/publications/Wallis_Cheng.2001.pdf |archive-date=18 May 2015 |url-status=dead }}</ref>