Tuning system for floating radio frequency trap
AssigneeIGC-Medical Advances, Inc.
InventorDerek Seeber
Life of this patent
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Abstract
A floating shield current trap provides two resonance loops formed of split concentric tubular conductors joined radially at their axial ends. Adjustment of the separation of these loops provides a change in coupling between the loops effecting a simplified tuning of the resonance of the trap for different expected frequencies of interfering shield current.
Claims18
A shield current trap for use with a shielded cable having an outer shield surrounding at least one inner conductor, the shield current trap comprising:
- a) a first trap element having a first inner conductive channel joined at respective first and second axial ends by a first and second radial conductor to first and second ends of a first outer conductive shell to form a first resonant loop;
- b) a second trap element having second inner conductive channel joined at respective first and second axial ends by a third and fourth radial conductor to first and second axial ends of a second outer conductive shell to form a second resonant loop;
- whereby the first and second inner conductive channels may be assembled in opposition to enclose the axially extending shielded cable;
- and
- c) a clamp assembly for controlling the separation of the first and second trap elements whereby coupling between the first and second resonant loops may be controlled to adjust a frequency at which the first and second conductive loops are resonant.
A shield current trap for use with a shielded cable having an outer shield surrounding at least one inner conductor, the shield current trap comprising:
- an axially divided cylindrical tube having metallized outer walls, inner walls, and bases, the axially divided cylindrical tube further having non-metallized opposed planer walls at the split, the opposed planar walls supporting an adjustment mechanism for controllably separating the opposed planar walls.
A shield current trap for use with a shielded cable having an outer shield surrounding at least one inner conductor, the shield current trap comprising:
- (a) a first split tubular conductor extending longitudinally between a first and second end;
- (b) a second split tubular conductor extending longitudinally between the first and second end and surrounding the first split tubular conductor, wherein the first and second tubular conductors are electrically connected at the first and second ends to provide at least one current path having an electrical length that is an odd multiple of one quarter of a wavelength of an external electrical interference signal;
- wherein the first and second split tubular conductors are openable to receive a portion of the shield of the shielded cable and adjustably closable to surround the portion of the shield of the shielded cable while remaining insulated from the shield of the shielded cable at one of a range of separation distances whereby coupling, between portions of the split tubular conductors, may be controlled to adjust a frequency at which the electrical length that is an odd multiple of one quarter of a wavelength of the external electrical interference signal.
Dependencies are inferred from the claim text.