An original and rigorous approach to the design of microwave active circuit

The real frequency technique (RFT) is an efficient numerical method to design matching networks of microwave active circuits. It provides several advantages over most of the usual techniques. Directly including measured scattering and noise parameter data, it does not require any rational functions or circuit models. Moreover, neither a pre-determined matching circuit topology is necessary. The described method also allows designing stability-guaranteed broadband circuits when employing potentially unstable transistors. With the Levenberg-Marquardt algorithm, the RFT can be applied to simultaneously optimize transducer power gain, input and output VSWRs, noise figure and group delay of a multistage microwave active circuit. Applications as different as low-noise amplifiers, active filters or broadband amplifiers are possible