• Millimeter-wave frequencies often refer to the frequency range from 30GHz to 300GHz,
the wavelength of which is between 10mm to 1mm.
• There are several motivations for wanting to use mm-wave frequencies in radio links:
The radio spectrum at mm-wave frequencies is still rather undeveloped, '
and more bandwidth is available at these frequencies.
• Because of higher attenuation in free space and through walls at mm frequencies,
the same frequency can be reused at shorter distances.
• The inherent security and privacy is better at mm-wave frequencies because of the limited
range and the relatively narrow beam widths that can be achieved.
• The spatial resolution is better at mm-wave frequencies since the small wavelength allows
modest size antennas to have a small beam width.