**6. Conclusion**

120 E-Learning – Organizational Infrastructure and Tools for Specific Areas

Fig. 15. Graphical solution given by the *LossyLine\_Eng\_FV.m* script for a short line.

Fig. 16. Graphical solution given by the *LossyLine\_Eng\_FV.m* script for a long line.

It is well known that many transmission line problems can easily be solved using graphical procedures based on the Smith chart. The authors still believe that the use of the Smith chart by the students is an important pedagogical tool even knowing that personal computers and calculators are commonly available nowadays.

Since the main topic of this book is concerned with *e-learning*, the aim of this chapter is to help the reader understand and learn how to use the Smith chart following a step by step procedure based on *MATLAB* scripts, that should be used when reading this chapter. This approach should teach the students to solve several kinds of transmission line problems by themselves in a paper chart using a pencil, a ruler and a compass.

To exemplify this concept, the authors developed *MATLAB* scripts that display, step by step, the graphical procedure used in several applications. Using these scripts, many aspects of the transmission line theory such as: the voltage, current, impedance, Voltage Standing Wave Ratio (VSWR), reflection coefficient and matching design problems can be easily interpreted and well visualized using the Smith chart.

The chapter was organized as follows:


The authors developed a *MATLAB* scripts that display, step by step, the graphical procedure that must be used to solve these examples.

All the *MATLAB* scripts can be download from the link: http://www.av.it.pt/rochap/MatlabScripts.zip
