BANDPASS FILTER Russian patent published in 2010 - IPC H01P7/00 

FIELD: power engineering.

SUBSTANCE: in available filter holder (6) of each disk dielectric resonator (DDR) (3) is arranged in the form of the first metal cylindrical rod (MCR) (7) with diametre D equal to (0.8-0.95)D_r, where D_r - diametre of open DDR (3), and with flat end surfaces (ES) (8) and (9) perpendicular to longitudinal axis of the first MCR (7), one of which, the first ES (8), is connected to inner wall (10) of hollow metal screen (1), and on the opposite - second ES (9) - there is the second MCR (11) installed axially with flat ES (12) and (13), perpendicular to longitudinal axis of the second MCR (11), with diametre d₁ equal to (0.2-0.35)D_r and with height h₁ equal to (0.9-1.5)H_r, where H_r - thickness of open DDR (3), at the end (13) of the second MCR (11) there is the third MCR (14) installed coaxially to it with diametre d₂ equal to (0.5-0.6)d₁ and with height h₂ equal to (0.3-0.4)h₁, the second and third MCR (11) and (14) are located in cylindrical dielectric bushing (CDB) (5) with external diametre DB, equal to diametre D of the first MCR (7), and inner diametre selected as equal to d₃=(1.0-1.1)d₁, besides height h₃ of CDB (5) is determined by ratio h₃=h₁+h₂+kD_r, where unitless coefficient k lies within the limits from 0.04 to 0.06, besides the second one of ES (15) in CDB (5) is connected to the second ES (9) of the first MCR (7).

EFFECT: improved electric characteristics of filter, by provision of proper heat removal from open disk dielectric resonators with preservation of high efficient own good quality of resonant links of filter and distancing parasite pass bands away from functional filter band.

4 cl, 4 dwg