Microwave tubes are power sources themselves at higher frequencies and can be used independently without any other devices.

Related MCQs

• The production of power at higher frequencies is much simpler than production of power at low frequencies.
• Noise figure can be defined for any microwave network irrespective of any other constraints.
• High gain is not achievable at microwave frequencies using BJT amplifiers because:
• Magnetrons are microwave devices that offer very high efficiencies of about 80%.
• 1 MICROWAVE PASSIVE COMPONENTS: DIRECTIONAL COUPLER, POWER DIVIDER, MAGIC TEE ATTENUATOR, RESONATOR
• In microwave oscillators, negative resistance transistors and diodes are used in order to generate oscillations in the circuit.
• In a diode frequency multiplier, an input signal of frequency fo applied to the diode is terminated with                   at all frequencies other than required harmonic.
• To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator.
• Reactive multipliers have a disadvantage that they cannot be used at very high frequencies and they become less efficient.
•                          is a microwave device in which the frequency of operation is determined by the biasing field strength.