Klystrons are specialised linear-beam vacuum tubes that are used as amplifiers for high radio frequencies, from UHF up to the microwave range. They were developed in 1937 by American electrical engineers Sigurd Varian and Russell. High-power klystrons are used as output tubes in UHF television transmitters, radar transmitters, and satellite communication to produce the driving power for contemporary particle accelerators. Low-power klystrons are employed as oscillators in terrestrial microwave relay communications lines.
In a klystron, radio waves and electron beams interact as they move through resonant cavities, which are metal boxes arranged down the length of a tube. The input signal is applied to a cavity that the electron beam first passes through. The signal is amplified by the electron beam's energy and extracted from a cavity at the other end of the tube.
Applications of Klystron
A Klystron can be used for the following things:
- Receivers for radio and RADAR
- the source of signals in microwave generators
- Portable microwave links use frequency-modulated oscillators.
- For parametric amplifiers, a pump oscillator
- Microwave receivers' local oscillator
Klystron operation is based on the principle of? (1) Velocity modulation (2) Amplitude modulation (3) Frequency modulation (D) Phase modulation
The klystron operates according to the velocity modulation hypothesis. When electrons in a beam alternately accelerate and decelerate, the velocity of the beam will fluctuate.