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The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively (a) 1.22 and 0.1 (b) 0.81 and 0.1 (c) – 1.22 and 0.1 (d)2.44 and 0.2 |
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Answer» Correct option (a) 1.22 and 0.1 Explanation: Return loss (dB) = - 20log10|ρ| Where ρ is the reflection coefficient. For |ρ| = 1 full reflection Return loss = 0 dB If |ρ| = 0.1 R. Loss (dB) = - 20log10(0.1) = - 20 x (- 1) = 20dB VSWR = (1 + |ρ|)/(1 - |ρ|) = (1 + 0.1)/(1 - 0.1) = 1.1/0.9 = 1.22 |
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