Patent ID: 6816037
Filing Date: 2004-11-09
Classification: H01P

Abstract:
A high frequency filter, comprising:a filter case having side walls, a generally open proximal end and a generally closed distal end; a partition within said filter case for separating the inside of said filter case into at least a first cavity and a second cavity, said partition having an aperture for coupling the first and second cavities; a first helical resonator coil disposed inside the first cavity of said filter case extending from the proximal end towards the distal end of said filter case; a second helical resonator coil disposed inside the second cavity of said filter case extending from the proximal end towards the distal end of said filter case; a first tap coil connectable in series with said first helical resonator coil at the proximal end of said filter case, the series connection between said first helical resonator coil and said first tap coil providing an input tap for coupling electrical signals to the high frequency filter; a second tap coil connectable in series with said second helical resonator coil at the proximal end of said filter case, the series connection between said second helical resonator coil and said second tap coil providing an output tap for coupling electrical signals from the high frequency filter; a removable tap housing for supporting said first tap coil at the proximal end of said filter case; a metallic coupling, having a brushing action, for electrically connecting the first and second coils with the first and second helical resonator coils at the respective series connections between the first and second tap coils and the first and second helical resonator coils, while providing a good electrical contact for the series connections.