T?n s? c?c k? cao (EHF) la b?ng t?n s? vo tuy?n cao nh?t. EHF n?m trong d?i t?n s? 30 t?i 300 gigahertz , t?n s? phia tren EHF la b?c x? đi?n t? đ??c coi nh? th?p h?n anh sang h?ng ngo?i, con đ??c g?i la b?c x? terahertz . B?ng t?n nay co b??c song t? 1 t?i 10 mm, nen con ten g?i khac la b?ng t?n mm hay song mm , đoi khi vi?t t?t la MMW hay mmW.

So v?i cac b?ng t?n th?p h?n, tin hi?u vo tuy?n m?t đ?t trong b?ng nay c?c k? d? b? suy hao trong khi quy?n, d?n đ?n EHF r?t it đ??c dung cho lien l?c t?m xa. đ?c bi?t, tin hi?u trong d?i 57–64 GHz r?t d? b? oxy h?p th?. Ngay c? v?i kho?ng cach ng?n, suy hao do m?a c?ng la m?t v?n đ? nghiem tr?ng, n??c m?a h?p th? tin hi?u lam c??ng đ? tin hi?u gi?m m?nh.

EHF đ??c ?ng d?ng trong nghien c?u khoa h?c, vi?n thong, quan s?, an ninh va y t?.

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• B?c x? terahertz

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Lien k?t ngoai [ s?a | s?a ma ngu?n ]

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• FCC 70/80/90 GHz overview. L?u tr? 2005-12-19 t?i Wayback Machine
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• Definition of frequency bands (VLF, ELF... etc.)
• Millimetre-Wave Technology Group L?u tr? 2009-09-23 t?i Wayback Machine at Rutherford-Appleton Laboratory
• Overview of active methods for shielding spacecraft from energetic space radiation L?u tr? 2012-04-14 t?i Wayback Machine
• St. Andrews University mm-wave group L?u tr? 2008-11-04 t?i Wayback Machine
• A Survey of University Capabilities for a New Canadian Radio Telescope L?u tr? 2008-02-26 t?i Wayback Machine
• US Patent 7220488 - Deflecting magnetic field shield L?u tr? 2011-06-12 t?i Wayback Machine
• Basic explanation on millimeter wave technology