Reflex klystron amplifier , microwave klystron amplifier

Reflex klystron amplifier used in microwave systems for generating higher frequency that we can used further for various purposes in microwave engineering.

1. REFLEX KLYSTRON Presented by: Presented to: Kamal Jeet Mr Rohit Giri B.tech(ECE) 3 rd yr Dept. of (ECE )

2. CONTENTS Introduction Construction Working Reflex Klystron oscillator Applications

3. Reflex Klystron Microwave Tubes – klystron, reflex klystron, magnetron and TWT R eflex klystron is single cavity variable frequency microwave oscillator Reflex Klystron that works on reflections and oscillations in a single cavity

4. Construction A reflex klystron consists of an electron gun, a cavity with a pair of grids and a repeller plate Accelerating grid are present which insists the electron to travel in linear beam

5. Reflex Klystron oscillator

6. Working The cathode emits electrons which are accelerated forward by an accelerating grid with a positive voltage on it and focused into a narrow beam The electrons pass through the cavity and undergo velocity modulation, which produces electron bunching and the beam is repelled back by a repeller plate kept at a negative potential with respect to the cathode. On return, the electron beam once again enters the same grids which act as a buncher

7. Working

8. W orking   e r  crosses the anode cavity but has no extra velocity and it repels back after reaching the Repeller electrode, with the same velocity let's say  e e  which has started earlier than reference electron, reaches the Repeller first, but returns slowly, reaching at the same time   late electron  e l , which starts later than both  e r and   e e , however, it moves with greater velocity while returning back, reaching at the same time Now, these three electrons, namely  e r ,  e e  and  e l  reach the gap at the same time, forming an  electron bunch .

9. Applications Radar receivers Local oscillator in microwave receivers Signal source in microwave generator of variable frequency Portable microwave links Pump oscillator in parametric amplifier

10. References https:// www.tutorialspoint.com/microwave_engineering/microwave_engineering_reflex_klystron.htm https:// en.wikipedia.org/wiki/Klystron http://www.edgefxkits.com/blog/klystron-amplifier-types-and-applications / http://blog.oureducation.in/what-and-how-of-microwave-communication-reflex-klystron / http://www.edgefxkits.com/blog/klystron-amplifier-types-and-applications /