BAND-PASS FILTER Russian patent published in 2025 - IPC H01P1/20 

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering and particularly to filters. Filter comprises a ceramic block with metal-coated faces, except for the upper one, coaxial resonators from the metallized holes connected to the ceramic block lower metallization and with metallized platforms on its upper face, separated from each other and the ceramic block side metallization by dielectric gaps, contact platforms for connection of generator and load, which are arranged on upper edge of ceramic block and separated from metallized platforms of extreme coaxial resonators and from side metallization with dielectric gaps. In gap between adjacent coaxial resonators one blind air hole is made symmetrically in longitudinal and transverse sections of filter, and the total number of blind air holes in the ceramic block is in the range from one to the maximum value equal to the number of gaps between adjacent coaxial resonators. End contact platforms for connection of generator and load are arranged on opposite end surfaces of ceramic block.

EFFECT: high slope of the high-frequency slope of the amplitude-frequency characteristic, attenuation in the stop band above the pass band, improved decoupling between the input and output of the band-pass filter.

1 cl, 14 dwg