What is the range of millimeter waves?

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

Millimeter wave is a band of electromagnetic spectrum that can be used in a broad range of products and services, such as high-speed, point-to-point wireless local area networks (WLANs) and broadband access.

Due to small wavelength, mmWave devices facilitate large antenna arrays to be packed in miniature physical dimension . Without varying antenna size, it is possible to pack more antenna elements at mmWave frequencies than at microwave frequencies resulting in narrower beam [1].