Chapter 6. Impedance-Matching Networks

Summary

One of the most critical requirements in the design of high-frequency electronic circuits is that the maximum possible signal energy is transferred at each point. In other words, the signal should propagate in a forward direction with a negligible echo (ideally, zero). Echo signal not only reduces the power available but also deteriorates the signal quality due to the presence of multiple reflections. The impedance can be transformed to a new value by adjusting the turn ratio of a transformer that couples it with the circuit. However, it has several limitations. This chapter presents a few techniques to design other impedance transforming networks. These circuits include transmission line stubs, and resistive and reactive networks. Further, the techniques introduced are needed in active circuit design at RF and microwave frequencies.