Advantages of Klystron | disadvantages of Klystron

This page covers advantages and disadvantages of Klystron. It mentions Klystron advantages or benefits and Klystron disadvantages or drawbacks. It provides links on various topics on Klystron.

What is Klystron?

It is one of the high power microwave tubes used as amplifier and oscillator. It makes use of transit time effect by varying the velocity of the electron beam. The klystron tube uses electrons in place of air which vibrate on specific frequency inside the glass tube to produce the microwave energy. It works based on principle of velocity modulation of electrons. The term "velocity modulation" refers to change in velocity of electrons as per change in the RF signal.

Two Cavity Klystron

Klystrons are classified as follows.
• Two cavity klystron: It is used as low power amplifier.
• Multi cavity klystron: There are few intermediate cavities used between buncher cavity and catcher cavity.
• Reflex klystron: It is used as oscillator.

The figure-1 depicts two-cavity klystron. As shown electron beam is generated by electron gun which passes through the space between input cavity (i.e. Buncher cavity) and output cavity (Catcher cavity). The RF signal to be amplified is coupled to input cavity. In the output cavity, signals are amplified by bunched electrons. Collector plate is used for collecting electron beam and release of heat energy.
All the above subsystems are enclosed in a vacuum envelope with vacuum sealed coaxial couplings. Refer Klystron basics>>.

Benefits or advantages of Klystron

Following are the benefits or advantages of Klystron:
➨It operates at higher efficiencies.
➨In klystron, each cavity operates independently and there is no mutual coupling.

Drawbacks or disadvantages of Klystron

Following are the disadvantages of Klystron:
➨Two cavity klystron amplifier is not low-noise device. Due to this fact, usually it is used in the transmitter and not in the receiver.
➨It is a narrow band device due to use of resonant cavities.

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