Английская Википедия:F band (waveguide)
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The waveguide F band is the range of radio frequencies from 90 GHz to 140 GHz in the electromagnetic spectrum,[1][2] corresponding to the recommended frequency band of operation of WR8 waveguides. These frequencies are equivalent to wave lengths between 3.33 mm and 2.14 mm. The E band is in the EHF range of the radio spectrum.
References
Шаблон:Radio spectrum Шаблон:EMSpectrum