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EARTH SCIENCE > SPECTRAL/ENGINEERING > MICROWAVE
Definition:
A very short electromagnetic wave. The portion of the electromagnetic
spectrum lying between the far infrared and the conventional radio
frequency portion. While not bounded by definition, it is commonly
regarded as extending from 1 mm to 1 m in wavelength (300 GHz to 0.3 GHz
frequency).

Passive systems operating at these wavelengths sometimes
are called microwave systems. Active systems are called radar, although
the literal definition of radar requires a distance measuring capability
not always included in active systems.

Reference:
Canada CCRS Remote Sensing Glossary
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