Nonlinear RF components such as mixers and power amplifiers.
QUCS is a freeware circuit simulator that supports S-parameter analysis, among other types. It is available for Windows, Linux and OSX operating systems, with varying levels of support from the community.
Operating Modes of Dynamic Power Supply Transmitter Amplifiers
Any amplifier operated with a varying supply voltage is actually a three-port circuit, having two inputs and one output. When an amplifier is characterized as a three-port for dynamic supply voltage operation, three separate operating modes...
Use this handy Smith Chart web app to create matching networks. Easiest tool to use: drag elements right on the chart! Supports multiple frequencies, transmission line elements, etc.
Online Smith Chart course now available at Udemy.
Pozar's new edition of Microwave Engineering includes more material on active circuits, noise, nonlinear effects, and wireless systems. Chapters on noise and nonlinear distortion, and active devices have been added along with the coverage of noise and more material on intermodulation distortion and related nonlinear effects. On active devices, there's more updated material on bipolar junction and field effect transistors.
The second of two volumes, this is a comprehensive treatment of nonlinear circuits, introducing the advanced topics that professionals need to understand for their RF (radio frequency) circuit design work. It presents an introduction to active RF devices and their modelling, and explores nonlinear circuit simulation techniques. Design techniques are addressed for RF transistor amplifiers, oscillators, mixers and frequency multipliers.
In this tutorial from High Frequency Electronics magazine, Anthony Bichler describes a technique to achieve broadband matching networks using the Smith Chart. The tutorial article also includes a review of Smith Chart fundamentals. The technique that is described goes beyond simply keeping the quality factor of the network to a minimum.
Free software for Windows that allows you to perform several different system calculations.
From the website: