Faça as conversões especificadas:

-10 dBm \(\rightarrow\) mW

\(10^{\frac{-10}{10}}=0,1\ \mathrm{mW}\)

+27 dBm \(\rightarrow\) mW

\(10^{\frac{+27}{10}}=500\ \mathrm{mW}\)

200 mW \(\rightarrow\) dBm

\(10\cdot\log\left(200\ \mathrm{mW}\right)=23\ \mathrm{dBm}\)

\(10^{-10}\ \) mW  \(\rightarrow\) dBm

\(10\cdot\log\left(10^{-10}\ \mathrm{mW}\right)=-100\ \mathrm{dBm}\)

\(\Gamma=+0,6\)\(\rightarrow\) SWR, perda de retorno

\(\mathrm{SWR}=\frac{1+\left|\Gamma\right|}{1-\left|\Gamma\right|}=\frac{1+0,6}{1-0,6}=4\).
\(\mathrm{RL}=-20\log\left(0,6\right)=4,44\ \mathrm{dB}\) 

\(\Gamma=-0,6\)\(\rightarrow\) SWR, perda de retorno