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\end{equation}  where $k_B = 1.380 x 10^{-23}$ Joule $K^{-1}$ is the Boltzmann constant, $A$ is the antenna collecting area, and $\eta_a$ is the antenna efficiency.   \begin{equation}\label{eq:antenna_efficiency}  \eta_a = \eta_{surface} * \eta_{$aperture blockage$} \eta_{blockage}  * \eta_{"feed spillover"} \eta_{spillover}  * \eta_{"illumination taper"} \eta_{taper}  \end{equation}  \subsubsection{Maximize System Efficiency}  \begin{equation}\label{eq:system_efficiency} 
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