Synthesis of active scattering operator by itsm^{-1}-derived passive operators

This correspondence is concerned with the synthesis of a given active scattering operator by means of a passive operator called the
m^{-1}
-derived passive operator (of the active operator). It is shown that by means of the
m^{-1}
-derived operator, an active operator can be synthesized by the well-known cascade load procedure. Furthermore, it will be shown that, like a passive operator, one can define the well-known characteristic operator function for an active operator. Relationships between the characteristic operator function of an active operator and that of its
m^{-1}
-derived operator are also studied.