How are klystrons and magnetrons used in radar and microwave systems?

Klystrons and magnetrons are specialized electron tubes that utilize vacuum technology to generate or amplify high-power microwave signals essential for radar and other communication systems.123

Magnetrons

The magnetron is a "crossed-field" power oscillator that generates microwave energy when voltage is applied. Because it self-oscillates, it is highly effective for low-average-power applications, such as ship navigation and airborne weather-avoidance radar. Beyond radar, magnetrons are the primary devices used to produce the microwave radiation found in microwave ovens.45

Klystrons

Unlike the magnetron, the klystron typically functions as a power amplifier, taking low-power signals and boosting them to high-power outputs. By controlling the speed of an electron stream through cavity resonators, klystrons achieve high efficiency and stability. They are capable of producing some of the highest power levels in radar—reaching hundreds of kilowatts—and are used in ultrahigh-frequency (UHF) circuits and television transmission.51

While solid-state devices have replaced vacuum tubes in many low-power applications, klystrons and magnetrons remain dominant in high-power, high-frequency environments where their ability to handle significant energy is required.2