Flexible CAD methodology for UWB filter with a tailored notch

In this paper, an original and flexible CAD methodology for different substrates, is presented for the design of an UWB filter equipped, if needed, with a notch at a desired frequency. The structure is designed in planar microstrip technology and it is capable of covering up to 120% of fractional bandwidth. This design methodology shows good performance with different materials either conventional or unconventional, as high-temperature superconductors for reducing losses at a minimum level. Furthermore the component has been designed with the aim of easily tailoring the notch frequency as a function of a single geometrical parameter. The procedures steps and relevant design results are shown together with the preliminary experimental characterization of a structure realized with a Rogers TMM10i substrate.