Abstract
A procedure for feedback controller synthesis in a loop containing a distributed-parameter system under a frequency-domain minimax criterion is suggested. An explicit iterative algorithm allows the computation of the optimal controller. The controlled system is assumed to be possibly of a non-minimum-phase unstable distributed-parameter type. Through application of approximation theory in a frequency-domain setting and the theory of indirect coprime factorization, a practical procedure for detailing the optimal feedback controller is found.