08-17-2017, 12:34 AM
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm).[1][2] This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. In all cases, microwave includes the entire SHF band (3 to 30 GHz, or 10 to 1 cm) at minimum, with RF engineering often restricting the range between 1 and 100 GHz (300 and 3 mm).
The prefix micro- in microwave is not meant to suggest a wavelength in the micrometer range. It indicates that microwaves are "small", compared to waves used in typical radio broadcasting, in that they have shorter wavelengths. The boundaries between far infrared, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study.
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, an emitting antenna, a receiving antenna (separate or the same as the previous one) to capture any returns from objects in the path of the emitted signal, a receiver and processor to determine properties of the object(s).
microwave radar - measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
radar, radio detection and ranging, radiolocation
dish aerial, dish antenna, saucer, dish - directional antenna consisting of a parabolic reflector for microwave or radio frequency radiation
Doppler radar - radar that uses the Doppler shift to measure velocity
early warning radar - a radar that is part of an early warning system
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
cathode-ray oscilloscope, CRO, oscilloscope, scope - electronic equipment that provides visual images of varying electrical quantities
pulse generator - a generator of single or multiple voltage pulses; usually adjustable for pulse rate
3d radar, three-dimensional radar - radar that will report altitude as well as azimuth and distance of a target
wave guide, waveguide - a hollow metal conductor that provides a path to guide microwaves; used in radar
weather radar - radar that is able to detect clouds and precipitation
