EQUIVALENT STATEMENT TO THE UNITARY CONDITION FOR LOSSLESS NETWORK
无耗网络幺正性条件的等价表述

The generalised magnitude-symmetry theorem for lossless network is extended, the phase information previously omitted is supplemented. The extended theorem is equivalent to the unitary condition for lossless network rigorously. Two illustrations are given for the applications of the theorem to analysing the properties of lossless network.