RADAR systems may be complex but their operation relies on a range of relatively simple resistor components. Resistors are used in pulse forming, sensing, switching, current limiting and RF termination applications, among others.
In the late 1800’s Heinrick Hertz proved that radio waves travel in a straight line and are reflected by a metal object. In RADAR equipment a pulse of high frequency radiation is emitted, based on the time and direction of the returning pulse the distance and direction of a metallic object may be calculated.