mmWave Millimetre Wave
A radio wave has a wavelength (λ) which corresponds to its frequency, for example 1GHz equates to a wavelength of ~30cm. The term mmWave typically refers to radio frequencies above 24GHz where the wavelength is measured in millimetres. For example, 24GHz equates to a radio wave with a ~12.5mm wavelength. mmWave frequencies are key for 5G, since the high frequencies are typically linked to high bandwidth opportunities.
