Patent ID: 6278341
Filing Date: 2001-08-21
Classification: H01P

Abstract:
A filter including a first filter portion for passing radio frequency signals of a first and second frequency band, comprising:a first signal port arranged to pass signals of the first and second frequency band,a second signal port arranged to pass signals of the first frequency band,at least a first signal ground plane,a first elongated conductor coextending substantially in parallel with the signal ground plane providing a first transmission line for the first frequency band between the first and second ports,at least one conductive stub segment, each having radio frequency characteristics and being connected to the first elongated conductor at an interconnection point, said radio frequency characteristics and each interconnection point being selected such that radio frequencies outside said first frequency band are effectively attenuated in said first transmission line,said filter being arranged in a housing forming at least a part of the signal ground device,said first elongated conductor and said at least one conductive stub segment being formed partly by a conductive pattern on a planar dielectric material, having a relative dielectric constant substantially greater than one, anda self supporting conductor being separated from the signal ground plane by a second dielectric having approximately the same dielectric constant as vacuum, and the at least one conductive stub segment being open-ended.