Klystron Amplifiers: Description of the function of the Two-Cavity Klystron and the Reflex (Repeller) Klystron. Figure 1: mode of operation of a klystron. Microwave Engineering Reflex Klystron - Learn Microwave Engineering in simple and The operation of Reflex Klystron is understood by some assumptions. Introduction to the Two-Cavity Klystron Amplifier. The klystron is a device for amplifying microwave frequency signals that achieve high levels of power gain by applying vacuum tube principles and the concept of “electron bunching”.


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Introduction to the Two-Cavity Klystron Amplifier

The now negative rightmost grid pushes them faster as it repels them on exit. Imagine you are an electron going through klystron working principle buncher and you are slowed down by the buncher. You would be cruising along and gently slowing down so all the other electrons around you would be spreading out in the direction of travel.

Life is good—lots of room up front. A whole bunch of electrons behind you got accelerated to a klystron working principle velocity and now they are catching up to you as you slow down into them! Now we are in a big bunch traveling down the drift space.

This diagram shows the electron bunching behavior as electrons traverse the drift space. A shows a snapshot at the start klystron working principle the transit. Klystrons are velocity-modulated tubes that are used in some radar equipments as amplifiers.

Klystrons make use of the transit-time effect by varying the velocity of an electron beam.


In their return journey, the electrons give more energy to the gap and these oscillations are sustained. The constructional details of this reflex klystron is as shown in the following figure.

It is assumed that oscillations already exist in the tube and they are sustained by its operation. Klystron oscillator[ edit ] An electronic oscillator can be made from a klystron tube, by klystron working principle a feedback path from output to input klystron working principle connecting the "catcher" and "buncher" cavities with a coaxial cable or waveguide.

Two-cavity klystron | electronics |

When the device is turned on, electronic noise in the cavity is amplified by the klystron working principle and fed back from the output catcher to the buncher cavity to be amplified again.

Because of klystron working principle high Q of the cavities, the signal quickly becomes a sine wave at the resonant frequency of the cavities. Multicavity klystron[ edit ] In all modern klystrons, the number of cavities exceeds two.

Additional "buncher" cavities added between the first "buncher" and the "catcher" may be used to increase the gain of the klystron, or to increase the bandwidth. The residual kinetic energy in the electron beam when it hits the collector electrode represents wasted energy, which is dissipated as heat, which must be removed by a cooling system.

Know about Klystron Amplifier Types with Applications

Some modern klystrons include depressed collectors, which recover energy from klystron working principle beam before collecting the electrons, increasing efficiency. Multistage depressed collectors enhance the energy recovery by "sorting" the electrons in energy bins. Reflex klystron[ edit ] Low-power Klystron working principle reflex klystron from The cavity resonator from which the output is taken, is attached to the electrodes labeled Externer Resonator.