Patent ID: 9203131
Filing Date: 2015-12-01
Classification: H01P

Abstract:
1. A band stop filter comprising: a resonant bar; a housing having sidewalls such that an upper portion of the sidewalls are thicker than a lower portion of the sidewalls forming a cavity in which the resonant bar is located to form a resonator, and having a multi-stage structure in which a width of an upper end portion of the cavity defined by the sidewalls is less than that of a lower end portion of the cavity defined by the sidewalls such that when the resonant bar is inserted in the cavity, a first distance between the upper end portion of the cavity defined by the sidewalls and the resonant bar is less than that of a second distance between the lower end portion of the cavity defined by the sidewalls and the resonant bar, and an upper surface of the cavity extending between the sidewalls having a through hole corresponding to a position of the resonant bar thereby allowing the resonant bar to extend into an upper cavity of the housing, wherein the upper cavity of the housing is located above the through hole; a lower cover to which the resonant bar is mounted, the lower cover being coupled to a lower part of the housing such that the resonant bar is inserted into the cavity and coupled to the housing, the lower cover defining a bottom surface of the cavity; a transmission line installed within a groove preset to the upper cavity of the housing such that the transmission line is coupled to the resonator formed by the cavity and the resonant bar within the cavity, and connected between a signal input terminal and a signal output terminal of the band stop filter; and an airtight cover for sealing the groove of the housing where the transmission line is installed.