Millimeter‑wave (Mmwave) communications

Millimeter‑wave communications refers to the use of radio frequencies in the thirty to three hundred gigahertz portion of the spectrum. In this band the wavelength is measured in millimetres, which allows antennas to be made very small and packed into arrays that can form narrow, steerable beams. The definition focuses on the physical frequency range and the way the signals are transmitted and received rather than any particular device or standard.

The appeal of mmWave lies in the sheer amount of bandwidth that is available at those frequencies. Because each hertz can carry data, the wide slices of spectrum translate into multi‑gigabit‑per‑second links, making it possible to support high‑definition video, immersive virtual reality, and massive numbers of simultaneous users. The directionality of the beams also helps to reuse spectrum in close proximity, but it brings challenges: the signals attenuate quickly through air, are easily blocked by walls or even rain, and therefore require line‑of‑sight paths and sophisticated beam‑forming hardware.

You will find mmWave technology most prominently in the latest generation of cellular networks often called five‑G, where it is used for both dense urban coverage and fixed wireless access to homes. It also appears in automotive radar that enables advanced driver assistance, in point‑to‑point backhaul links between towers, and increasingly in indoor hotspot equipment that delivers gigabit Wi‑Fi over short distances. In each case the concept remains the same – exploiting the high‑frequency, millimetre‑scale part of the spectrum to achieve data rates and spatial performance that lower frequencies cannot provide.