ABSTRACT
The role of filters in many electrical and microwave systems cannot be overestimated. The frequency response of a filter can impact significantly on the performance of a whole system. The continuously evolving communication systems demand high-performance filters with the characteristics as close to the ideal as possible. The lack of ideal reactive elements makes all the classical design methods insufficient in practical application. Despite the fact that the position of zeros cannot be restored, the magnitude function of the lossy filter with the element values modified in this way can be almost ideal. This relationship may be considered as the trade-off between the level of the introduced losses and the symmetry of the doubly terminated filter. Coefficients b′k in are functions of filter elements and of added losses. The obtained filter is not yet feasible, since the ideal reactive elements were assumed during the process of synthesis.
