Aplicación de la simulación electromagnética en el estudio de filtros paso banda en microstrip

Abstract

In this paper we present the study of electromagnetic simulation as an educational tool for microwave filters. We have started from the classic coupled lines filter, simulated both by traditional and electromagnetic methods. This way, we can obtain the frequency response and also the electric field distribution. Later, we have introduced ladder line and SIR structures into the classic filter to show the variations in the filter behaviour. These structures have been used to reduce filter size. Finally, we have combined both techniques in the same device. Several filters have been constructed and measured to validate the results obtained by simulation. The proposed designs let us verify concepts such as field distribution, phase velocity and resonator shape influence.