• 专利标题:   Method for cloaking object by absorbing electromagnetic radiation at microwave and terahertz frequencies, involves placing layers of graphene sheet and transparent dielectric layer on or about object, and absorbing portion of frequencies.
  • 专利号:   US8610617-B1, DE102013210161-A1, US2013335254-A1, CN106879237-A
  • 发明人:   AVOURIS P, GARCIA A V, SUNG C, XIA F, YAN H
  • 专利权人:   INT BUSINESS MACHINES CORP, INT BUSINESS MACHINES CORP, INT BUSINESS MACHINES CORP, INT BUSINESS MACHINES CORP
  • 国际专利分类:   H01Q017/00, H05K009/00
  • 专利详细信息:   US8610617-B1 17 Dec 2013 H01Q-017/00 201401 Pages: 8 English
  • 申请详细信息:   US8610617-B1 US530725 22 Jun 2012
  • 优先权号:   US523182, US530725

▎ 摘  要

NOVELTY - The method involves placing alternating layers of a graphene sheet (24-1) and a transparent dielectric layer (26) on or about an object (22) to be cloaked from an electromagnetic radiation, where the transparent dielectric layer is placed intermediate to the graphene sheet and another graphene sheet (24-2), the object comprises curvilinear surfaces and the graphene sheets are formed by chemical vapor deposition. A portion of microwave and terahertz frequencies is absorbed. Refractive index or thickness of the dielectric layer is adjusted. USE - Method for cloaking an object by absorbing electromagnetic radiation at microwave and terahertz frequencies emitted from an electromagnetic wave generating source for commercial and military applications. ADVANTAGE - The method allows intraband absorption to dominate and a single layer to absorb 30% at light wavelength of 300 microns depending on carrier concentration in the graphene as evidenced by transmission spectrum at the microwave and terahertz frequency ranges, so that utilization of graphene for microwave and terahertz frequency absorption provides an ultra-thin and efficient absorption layer relative to other materials e.g. dielectric materials. The method enables including additives to modify surface tension, improve flow properties, improve finished appearance, increase wet edge, improve pigment stability, impart antifreeze properties, control foaming and control skinning of the object. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an electromagnetic broadband absorption structure absorbing electromagnetic radiation at microwave and terahertz spectrums and including graphene sheets separated by transparent intermediate layers. Graphene sheets (14-n-1, 24-1-24-n) Electromagnetic broadband absorption structure (20) Object (22) Transparent dielectric layer (26)