The short-circuit admittance matrix o a two-port network is
$$ \left[\begin{array}{cc} 0 & -1 / 2 \\ 1 / 2 & 0 \end{array}\right] $$
The two-port network is
- non-reciprocal and passive
- non-reciprocal and active
- reciprocal and passive
- reciprocal and active