BANDPASS FILTER Russian patent published in 2014 - IPC H01P1/20 H01P1/203 

FIELD: radio engineering, communication.

SUBSTANCE: filter contains a dielectric plate, one surface of which is metal-coated, and the to the opposite one longer conductive strip sections are fixed, located in parallel and divided by dielectric intervals, input and output sections of strip conductors, which are fixed to the same side as the conductive strip sections, longer flat dielectric plate with one side metal-coated and the other one having a section of conducting strip placed. The length of longer flat dielectric plate is at least equal to the sum of widths of all conducting strips sections and intervals between them, and the plate longer strip width is from 0.1 to 0.2 of wavelength for dielectric plate at the filter's centre frequency. The width of the conductive strip section, fixed to the surface of the longer flat dielectric plate, is equal to the width of the longer flat dielectric plate. The surface of the latter is facing the surface of the dielectric plate, and the conductive strip section of the longer flat dielectric plate is isolated from longer conductive strip sections of the dielectric plate.

EFFECT: sharper slope of the filter frequency response characteristic.

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