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in units of Janskys per synthesized beam area.   \subsubsection{Minimize SEFD}  \begin{equation}\label{eq:system_equivalent_flux_density}  SEFD = {\frac{T_{sys}}{K}} {\frac{T_{sys}}{\frac{\eta_a A}{2k_B}}}  \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_{feed spillover} * \eta_{illumination taper}  \end{equation}  \subsubsection{Maximize System Efficiency}  \begin{equation}\label{eq:system_efficiency} 
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