| 词条 | E band (waveguide) |
| 释义 |
| name = Waveguide E band | freq = 60 – 90 GHz | wave = 5 – 3.33 mm | bands = {{hlist|item_style=white-space:nowrap; |V{{\\}}W (IEEE) |EHF (ITU)}} }} The waveguide E band is the range of radio frequencies from 60 GHz to 90 GHz in the electromagnetic spectrum,[1][2] corresponding to the recommended frequency band of operation of WR12 waveguides. These frequencies are equivalent to wave lengths between 5 mm and 3.333 mm. The E band is in the EHF range of the radio spectrum. Atmospheric effectsAt these high frequencies, the short wavelengths give the radiation a very directional quality, similar to visible light. Many molecules possess rotational and vibrational states excited by very specific wavelengths in this band, thus the atmospheric gasses such as oxygen, water vapor, carbon dioxide and nitrogen can absorb, and be excited causing variable beam attenuation effects dependent on meteorological and atmospheric conditions. Applications{{see also|W band}}In October 2003, the Federal Communications Commission (FCC) ruled that spectrum at 71 to 76 GHz, 81 to 86 GHz and 92 to 95 GHz was available for high-density fixed wireless services in the United States.[3] The Radio Regulations of the International Telecommunication Union allow amateur radio and amateur satellite operations in the frequency range 76.000 GHz to 81.000 GHz, which is known as the 4-millimeter band. References1. ^{{cite book|author=Victor L. Granatstein|title=Physical Principles of Wireless Communications, Second Edition|url=https://books.google.com/books?id=YClQiddGGfkC&pg=PA6|date=26 March 2012|publisher=CRC Press|isbn=978-1-4398-7897-2|page=6}} {{Radio spectrum}}{{EMSpectrum}}2. ^{{cite book|author=Jonathan Wells|title=Multigigabit Microwave and Millimeter-Wave Wireless Communications|url=https://books.google.com/books?id=0nwitcAjScoC&pg=PA4|year=2010|publisher=Artech House|isbn=978-1-60807-083-1|pages=4}} 3. ^{{cite web |url=http://rfdesign.com/mag/605RFDF4.pdf |title=Multigigabit wireless technology at 70 GHz, 80 GHz and 90 GHz, RF Design |date=May 2006 |last=Wells |first=Jonathan |accessdate=2014-03-03 |publisher=Defense Electronics Magazine}} 1 : Radio spectrum |
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