A theoretical basics of microwave networks for software defined radio systems

The article briefly reports the basic concepts and principles related to transmissions lines, modeling of linear networks, defining S parameters, and some elements relevant to microwave metrology and the design of network. The advantages and use of the scattering matrix and scattering parameters are discussed. Examples of the microwave networks provide a whole picture of the problem. Scattering matrix and scattering parameters are used to describe the microwave network and vector analyzer. They could be determined with the help of the reflection coefficient. Also using of the vector analyzer in the software defined radio systems is shown.