RF signals between 890 MHz and 20 GHz. Point-to-point microwave transmission is commonly used as a substitute for copper or fiber cable.
A form of electromagnetic radiation that is beyond the range of the visible light spectrum. Microwaves have very high frequencies and wavelengths of 1 mm to 50 cm.
A term loosely applied to those radio frequency wavelengths which are sufficiently short to exhibit some of the properties of light. Commonly used for frequencies from about 1 GHz to 30 GHz.