BANDPASS FILTER Russian patent published in 2016 - IPC H01P1/203 

FIELD: radio engineering.

SUBSTANCE: invention relates to microwave devices. Bandpass filter has rectangular metal body 1, formed by parallel flat walls 2, off scale for central frequency of filter, n metal rods 3, which number is equal to order of filter, arranged parallel to each other and separated by dielectric gaps 4, wherein one ends of adjacent metal rods 3 are connected to opposite flat walls 2, and ends of extreme metal rods 3 are connected to central conductors 5 of coaxial connectors 6 of external transmission lines, connectors 6 shells 7 are connected to housing 1. Filter has n flat capacitors 8, formed by each of dielectric plate 9 with metallized parallel surfaces 10 forming coatings of capacitors, other ends of rods 3 are connected to first plates of capacitors 8, which second plates are located on walls of housing 2. Capacitance C of capacitors 8 is defined by disclosed relationships binding length of metal rods 3 lying in range from 1/7 to 1/10 of wavelength λ at centre frequency ω₀ of filter bandpass, speed of light in vacuum, rods 3, distance between flat walls 2 parallel to metal rods 3.

EFFECT: invention provides for displacement of nearest parasite pass bands of filter in high-frequency domain exceeding 4-5 values of centre bandwidth frequency.

1 cl, 2 dwg