This thesis develops a methodology based on the Generalized network Theory, that allow to analyze a kind of open and closed electromagnetic problems.
	An electromagnetic problem is segmentated in a simpler problems where each one is solved by means of the technique that best suits the problem to produce its generalized inmittance matrix.
	As a direct application of this methodology, the bidimensional dielectric circular sector problem is analyzed in detail. The sector is dealt with as a four port individual element and, by means of the network theory, it will allow to analyze more complex inhomogeneous problems.
	Another direct application of this theory and this element is the analysis of  the inhomogeneous dielectric wedges and the direct applications to the diffraction phenomena.
	In all cases results have been comparated with those available in the open bibliography. The conclusion is that the results obtained by this method are very good.
	Finally, in addtion to this, another problems, not available in the bibliography but of great interest,  have been solved, such as corrugated cilynders used in mathching problems or the high losses cilynders.