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一、毫米波通信概述 按无线电波段的划分，波长在１－１０ｍｍ之间（即频率在３０－３００ＧＨＺ之间）的无线电波称为毫米波，有时把稍低于３０ＧＨＺ的无线电波也称为毫米波。毫米波波长较短，只适合视距通信。根据电波在自由空间传播损耗Ｌｓ＝（４πｄ／λ）２可知，波长越
I. Overview of millimeter wave communication According to the division of the radio wave band, the radio wave with a wavelength between 1-10 mm (ie, the frequency between 30-300 GHz) is called a millimeter wave and sometimes a radio wave slightly lower than 30 GHz is also referred to as a millimeter wave. Millimeter wave wavelength is shorter, only suitable for line of sight communication. According to the wave propagation loss in free space Ls = (4πd / λ) 2 shows that the wavelength is more