What is mmWave range?

Millimeter wave (MM wave), also known as millimeter band, is the band of spectrum with wavelengths between 10 millimeters (30 GHz) and 1 millimeter (300 GHz) . It is also known as the extremely high frequency (EHF) band by the International Telecommunication Union (ITU).

Millimeter waves are electromagnetic (radio) waves typically defined to lie within the frequency range of 30–300 GHz .

The purpose of this paper is to examine some these challenges from the point of view of antenna design for 5G. These include: low-cost and low-loss phase shifters for scanning array antennas; low-profile high gain aperture; wideband circularly polarized antenna elements for arrays; wide-angle beam scan .