Which electron tubes are used to provide microwave power for radar systems?

Several types of electron tubes are utilized to generate or amplify microwave power for radar systems. These devices are essential for high-power microwave applications, serving as either self-oscillating power sources or power amplifiers.12

The primary electron tubes used in radar include:

• Magnetrons: These function as power oscillators, generating microwave energy when voltage is applied. They are widely used in applications such as ship navigation and airborne weather-avoidance radar.31
• Klystrons: These act as power amplifiers, taking low-power input signals and amplifying them to high power levels. They are capable of producing very high average power and are valued for their stability.14
• Traveling-wave tubes (TWT): These are related to the klystron and are capable of operating over very wide bandwidths, particularly at lower peak power levels.1
• Other varieties: The broader category of tubes used for high-power microwave generation also includes crossed-field amplifiers, gyrotrons, and free-electron lasers.2

While solid-state devices are also used in modern radar, electron tubes remain the technology of choice for many high-power requirements.12