Patent ID: 7486162
Filing Date: 2009-02-03
Classification: H01P

Abstract:
1. A high frequency filter of coaxial construction, including at least one resonator comprising: an electrically conductive internal conductor configured as an internal conductive tube; an electrically conductive external conductors; an electrically conductive base which electrically interconnects the internal conductor and the external conductors; a cover covering at least the high frequency filter with respect to the base and having an inner side and outer side, the inner side pointing toward a free end of the internal conductive tube; a dielectric layer having a relative dielectric constant greater than 2 arranged between the outer side of the cover and the free end of the internal conductive tube; the radial extent of the dielectric layer substantially covering the cross section of the internal conductive tube at the free end thereof; wherein the dielectric layer is arranged on or fastened to the cover, and wherein the dielectric layer is inserted in a recess in the inner side of the cover.