Multicavity Klystron Amplifiers

Multicavity Klystron Amplifiers 

• Typically power gain of two -cavity klystron is 30dB . 
• To increase the overall gain, connect several two-cavity tubes in cascade, feeding the output of each of the tubes to the input of following one. 
• So, to provide high -gain multicavity klystron  have designed and produced.

Construction  or working

Diagram of Multicavity Klystron Amplifiers 

• Fig. above  shows  the construction  of four cavity klystron.
• Here intermediate cavity act as a buncher which passes electron beam inducing an enhanced RF voltage than the previous cavity.
• With four cavities, power gain of around 50 dB can be easily achieved. 
• Practically upto seven cavities have been used.
• For narrow band operation , the cavities can be tuned to the same frequency i.r synchronous tuning.
• For broadband operation  the intermediate cavities are tuned to either side of center frequency i.e stagger tuning.
• Stagger tuning improve the bandwidth.
• Stagger tuning is employed in UHF klystron for TV transmitter output tubes and satellite earth station transmitter as power amplifier at 6GHz.

Applications:-

1. It is used as a medium, high and very high power amplifier in the UHF and microwave ranges.
2. Used in satellite earth station transmitter as power amplifier.
3. Used in UHF TV transmitter.   

👉Two Cavity Klystron Amplifier 

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