📊 Antennas and Microwave Engineering
Q. Any device with negative impedance as its characteristic property can be called:
  • (A) energy source
  • (B) energy sink
  • (C) oscillator
  • (D) none of the mentioned
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✅ Correct Answer: (A) energy source

Explanation: a positive resistance implies energy dissipation while a negative resistance implies an energy source. the negative resistance device used in the microwave oscillator, thus acts as a source. the condition xin+ xl=0 controls the frequency of oscillation. xin is the impedance of the negative resistance device.

Explanation by: Mr. Dubey
a positive resistance implies energy dissipation while a negative resistance implies an energy source. the negative resistance device used in the microwave oscillator, thus acts as a source. the condition xin+ xl=0 controls the frequency of oscillation. xin is the impedance of the negative resistance device.

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