What is the principle of klystron?
Working Principle of Reflex Klystron Reflex Klystron works on the principle of velocity and current modulation. The electron beam is injected from the cathode. The electron beam passes through the accelerating anode. The electron moves in the tube with uniform velocity until it reaches the cavity.
What is the difference between magnetron and klystron?
It must operate only as oscillator. Magnetron devices are tunable. This means that output frequency can be changed by varying resonant frequency of cavity. There are two ways to tune the magnetron viz….Magnetron.
| Klystron | Magnetron |
|---|---|
| It can be used both as amplifier and oscillator. | It can only be used as oscillator. |
What is bunching in klystron?
The klystron utilizes a phenomenon called electron bunching which goes as follows: Electrons in a beam leaving a source at high velocity all have a roughly equal velocity in the direction of travel. The grid’s negative charge pushes back on the electrons as they pass through the negative left grid slowing them down.
What is velocity modulation in two-cavity klystron?
Content: Two-cavity Klystron The variation in the velocity of electrons while moving inside the tube is known as velocity modulation. This velocity modulation permits bunching of electrons while propagation. So, the combined energy of bunched electrons is transferred at the output thereby providing an amplified signal.
What is the major disadvantage of klystron amplifier?
Klystron amplifiers have high noise output as compared to crossed field amplifiers. A major disadvantage of frequency multipliers is that they multiply the noise factor along with frequency….
| Q. | A major disadvantage of klystron amplifier is: |
|---|---|
| C. | high source power |
| D. | design complexity |
| Answer» b. low bandwidth |
What is klystron and its types?
A klystron includes one or more cavities, which control the electrical field around the axis of the tube. Based on the resonant cavities, klystron amplifiers are classified into two types. Two cavity klystron amplifier. Reflex klystron amplifier.
What is a magnetron used for?
Magnetrons are capable of generating extremely high frequencies and also short bursts of very high power. They are an important source of power in radar systems and in microwave ovens.
What do you mean by klystron tube?
A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier for high radio frequencies, from UHF up into the microwave range.
What are the advantages of klystron?
Advantages of Klystron Amplifiers They can be used to generate far higher microwave power that solid state microwave devices like Gunn diodes. They can operate over a wide frequency range from hundreds of MHz (UHF) through hundreds of GHz.
What are the applications of magnetron?
Applications for magnetrons include radar, microwave ovens, and lighting systems. In radar devices, magnetrons use very short pulses of applied voltage. In microwave ovens, a waveguide leads to a port in the cooking chamber.
Why is klystron used?
Low-power klystrons are used as oscillators in terrestrial microwave relay communications links, while high-power klystrons are used as output tubes in UHF television transmitters, satellite communication, radar transmitters, and to generate the drive power for modern particle accelerators.
Why klystron is called an O type device?
Klystrons and TWT’s are linear beam or O type tubes in which the accelerating electric field in the same direction as the static magnetic field used to focus the electron beam. A klystron is a vacuum tube that can be used either as a generator or as an amplifier of power at microwave frequencies.
How is the reflex klystron oscillator theory explained?
The Reflex Klystron Oscillator theory is explained below. Reflex klystron is a single cavity klystron that can be used as low power microwave oscillator. Due to the DC voltage in the cavity, a Radio Frequency (RF) noise is generated. The electron beam injected from the cathode is velocity modulated by the cavity gap voltage.
How is a klystron different from a magnetron?
The Klystron is a vacuum tube which used as an oscillator and amplifier of microwave signals. The magnetron is different from the klystron tube. The magnetron used only as an oscillator. In a klystron, the electron is injected normally from the cathode.
Who is the inventor of the klystron tube?
A Klystron (also known as a Klystron Tube or Klystron Amplifier) is a vacuum tube that is used to oscillate and amplify microwave frequency signals. It was invented by American electrical engineers Russell and Sigurd Varian. A klystron uses the kinetic energy of an electron beam.
How are low power and high power klystrons used?
Low-power klystrons are used as oscillators in terrestrial microwave relay communications links, while high-power klystrons are used as output tubes in UHF television transmitters, satellite communication, radar transmitters, and to generate the drive power for modern particle accelerators.