Aspects Regarding the Improvement of the Constant-k Filter Performances

Electric filters are widely used in telecommunications and power electronics applications. The classic passive filters still retain their practical utility, due to their advantages related to the wide spectrum of operating frequencies. In this context, the paper is focused on the analysis of constant-k passive filters. The aim is to find constructive variants that would ensure the best possible attenuation slope in the vicinity of the cut-off frequency, an aspect that offers a better selectivity of the signal frequencies that cross the filter. The influence of losses due to the resistances of the elements on the filter performance was also analyzed. The analyses and the obtained results complete the existing notions in the specialized literature.