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An admittance inverter changes an output admittance $Y_{out}$ to its inversely proportional value $Y_{in}$, multiplied by a value B²:

$$Y_{in}=\frac{B^2}{Y_{out}}$$

B is a susceptance, and is called the characteristic admittance of the inverter.

Different options exist to realize an admittance inverter, of example:

$$\begin{bmatrix} a & b\\c & d \end{bmatrix}$$

Reference: Tosic, D. V., & Potrebic, M. (2006). Symbolic analysis of immittance inverters, 14th Telecommunication Forum. Belgrade (Serbia), 21-23.