ISRO Electronics & Communication (ECE) 2015 - Question 47

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Topic: Microwave Engineering

The VSWR of a microwave unit is 1.5, the return loss is:

  • A. 14 dB
  • B. 16 dB
  • C. 18 dB
  • D. 11 dB

Answer: A. 14 dB

Explanation: VSWR = 1.5. |Γ| = (VSWR - 1)/(VSWR + 1) = 0.5/2.5 = 1/5. Return loss = -20 log10 |Γ| = 20 log10 5 ≈ 14 dB.

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