Klystron

Two Cavity Klystron

1. Klystrons

2. •A klystron is a vacuum tube that can be
used either as a generator or as an
amplifier of power, at microwave
frequencies.

3. Two Cavity Klystrons

4. Constructions
•An electron beam
•Two metal boxes known as cavity
resonators
•A collector

5. Functions in First Cavity
The electrons are
emitted by the
cathode with high
kinetic energy

6. Electron Bunch Formation
•Cavity resonator is similar to conventional resonant
circuit
•Cavity’s resonance depends on the input signal
frequency

7. Alternating electric field makes the electrons alternating
accelerated and decelerated

8. Functions in Second Cavity
The bunches arrives
at intervals
corresponding to the
frequency 1
st
cavity
oscillates
The magnetic field
produced in the
cavity is linked with a
cable and thus
initiates amplified
output signal

9. Why Amplified?
•The majority electrons are bunched and these are
decelerated and a few are accelerated
•The result is almost all the kinetic energy is converted into
electromagnetic energy

10. Multi Cavity Klytron
Widely used because of large amplification

11. Reflex Klystrons

12. Thank You