Patent ID: 7170363

Claim:
A guide for r.f. magnetic flux which comprises an array of capacitive elements, the array exhibiting a predetermined magnetic permeability in response to incident electromagnetic radiation lying within a predetermined frequency band, wherein each capacitive element includes a low resistance conducting path and is such that a magnetic component of the electromagnetic radiation lying within the predetermined frequency band induces an electrical current to flow around said path and through said associated element, wherein the spacing of the elements is less than the wavelength of the radiation within the predetermined frequency band, wherein the size of the elements and their spacing apart is selected such as to provide a magnetic permeability which is greater than that of free space to electromagnetic radiation in the predetermined frequency band, further including a first elongate region and a second elongate region, wherein the second elongate region is arranged end to end with the first elongate region but inclined at an angle to the first elongate region.