Correct Answer - Option 3 : Klystron
Klystrons are the most ideal source of the microwave, used for microwave frequency measurements.
Based on the resonant cavities, klystron amplifiers are classified into two types.
- Two cavity klystron amplifier
- Reflex klystron amplifier
Important Comparisons:
The frequency range of different microwave sources are as shown:
Parameters
|
Klystron
|
Magnetron
|
TWTs
|
Frequency
|
Few GHz to hundred GHz
|
1 - 25 GHz
|
1 to 10 GHz
|
Output Power
|
10 MW
|
Several kW
|
Order of kW
|
Efficiency
|
10 %
|
30 - 60 %
|
20 %
|
Uses
|
Oscillator and Amplifier
|
Oscillator
|
Oscillator and Amplifier
|
Also, the frequency comparison of different oscillators are as shown:
Type of Oscillator
|
Approximate frequency range |
Crystal oscillator |
Fixed frequency |
Tickler feedback oscillator |
Nearly fixed frequency |
Wien bridge oscillator |
1 Hz to 1 MHz |
Phase-shift oscillator |
1 Hz to 10 MHz |
Hartley's oscillator |
10 kHz to 100 MHz |
Colpitt's oscillator |
10 kHz to 100 MHz |