The article presents the structure of the method for the synthesis of microwave bandpass filters (BPF) on non-uniform lines, which makes it possible to select the structure and parameters of the BPF that provide the maximum length of the stop band to meet the requirements of electromagnetic compatibility (EMC) with given restrictions on the attenuation characteristics in the passband and barrier bands.  and the established design and technological limitations on the drop in wave resistance and manufacturing tolerances.  The results of experimental studies of the characteristics of ultrahigh-frequency bandpass filters with an increased protective band in order to ensure EMC are presented.