Properties of positive real functions, Foster's and Cauer's methods for LC-RC and RL networks, Brunei's impedance synthesis method, lossless two-port networks, Cauer's two-port method, transfer function, partial pole removal, zero shifting, the synthesis of doubly terminated reactance two-port network, transducer parameter H(s), relations between H(s) and Z or Y parameters, reactance ladder realization, approximation theory, Butterworth and Chebyshev approximations, design of filters.