Editing Cloaking device (section)

===Plasma stealth===
{{Main|Plasma stealth}}
[[plasma (physics)|Plasma]] at certain density ranges absorbs certain bandwidths of broadband waves, potentially rendering an object invisible. However, generating plasma in air is too expensive and a feasible alternative is generating plasma between thin membranes instead.<ref>[http://adsabs.harvard.edu/abs/1990sri..reptQ....V Plasma cloaking: Air chemistry, broadband absorption, and plasma generation] [http://www.stormingmedia.us/44/4402/A440222.html backup] {{webarchive|url=https://web.archive.org/web/20090802184503/http://www.stormingmedia.us/44/4402/A440222.html |date=2009-08-02 }}, February 1990.</ref> The [[Defense Technical Information Center]] is also following up research on plasma reducing [[Radar cross-section|RCS]] technologies.<ref>Gregoire, D. J. ; Santoru, J. ; Schumacher, R. W.[http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA250710 Abstract] {{webarchive|url=https://web.archive.org/web/20090802062206/http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA250710 |date=2009-08-02 }} [http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA250710&Location=U2&doc=GetTRDoc.pdf Electromagnetic-Wave Propagation in Unmagnetized Plasmas] {{webarchive|url=https://web.archive.org/web/20090802062201/http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA250710&Location=U2&doc=GetTRDoc.pdf |date=2009-08-02 }}, March 1992.</ref>  A plasma cloaking device was patented in 1991.<ref>Roth, John R. "Microwave absorption system" {{US patent|4989006}}</ref>