Natural modes of partitioned networks in analysis and synthesis of transfer functions

The letter describes a relatively rapid computational method of finding the natural modes of four-pole networks by partitioning and using a modification of potential-analogue type of computation in application to natural modes of the parts of the network obtained by partitioning. The method described may be regarded as an extension of the bisection method applicable to symmetrical networks. It lends itself well to iterated networks, yielding accurate results also for lossy networks and physically realisable impedances of termination.