High-frequency signal levels must be raised to extend the reach of critical electronic systems, such as in radars and tactical communications links. RF/microwave power amplifiers (PAs) provide this function for continuous-wave (CW) and pulsed signals in electronic-warfare (EW), radar, radio, and satellite-communications (satcom) systems of many shapes and sizes, drawing upon a variety of active-device technologies.
Some aerospace and defense (A&D) and satcom systems still rely on vacuum electronics like traveling-wave tube amplifiers (TWTAs). But most A&D systems count on solid-state power amplifiers (SSPAs) to boost their signal levels. Regardless of technology, higher output power requires larger PA sizes.