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GATE ECE 2008 | Question-65

At $20 \; \mathrm{GHz}$, the gain of a parabolic dish antenna of $1$ meter diameter and $70 \%$ efficiency is

  1. $15 \mathrm{~dB}$
  2. $25 \mathrm{~dB}$
  3. $35 \mathrm{~dB}$
  4. $45 \mathrm{~dB}$
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