1 1 vote At $20 \; \mathrm{GHz}$, the gain of a parabolic dish antenna of $1$ meter diameter and $70 \%$ efficiency is $15 \mathrm{~dB}$ $25 \mathrm{~dB}$ $35 \mathrm{~dB}$ $45 \mathrm{~dB}$ Antennas gate2008-ec antennas analog-communications numerical-answers + – admin 252 views answer comment Share Follow Add Sync Questions Print 0 reply Please log in or register to add a comment.