Design of broadband complex impedance-matching networks and their applications for broadbanding microwave amplifiers

In this paper design a method is presented for broadband matching of complex impedances using distributed circuit elements. The method is a combination of the classical analytic network theory approach for lumped element matching networks and of the numerical optimization techniques. The aim is to create distributed element matching networks for Rf transistors in order to design broadband amplifiers in a systematic way. The design method is demonstrated by several realized and tested microstrip matching circuit in the 1.5….2.5GHz frequency range, which are well applicable for amplifier design. A microwave amplifier example operating in the 1…2GHz band is shown as well.