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Two possible methods of achieving high output power in microwave system . . . Important Parameters Peak power
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1. Microwave Tubes
3. Important Parameters
Peak power Average power
Efficiency Gain
Bandwidth Frequency
Harmonic and spurious power Intermodulation products
Manufacturability at low cost
5. Klystron
6. TWT
7. Major applications for TWTs include:
Amplifiers:
Space applications
Radar
Electron Counter Measure
Missile
Driver for other high power RF amplifiers
8. Missile TWTs for Active Seekers
Features that influence the design include:
Minimal size and weight;
Narrow-to-moderate bandwidths;.
Off-to-fully-operational turn-on times of one second or less;
High efficiency;
High reliability after long inactive storage periods.
Normally, these TWTs are of the periodic-permanent-magnet (PPM) focused helix variety. They normally utilize unique cathode-heater designs to provide the very fast warm-up required. They typically have multiple stage depressed collectors with conduction cooling.