Szukana fraza: [Abstract = "A novel synthesis method of linear electric networks with periodically variable parameters is presented. These types of networks can be implemented as resistance\-parametric, \(conductance\-capacitance\)\-parametric or \(resistanceinductance\)\- parametric multiports. The time\-varying parameters are determined so as to extremize some specific optimisation criteria. Consequently, the synthesis task has a unique solution. The starting point of the solution method is the original theorem proved in the paper, which deals with the minimum\-energy networks."]