Flexible Magneto-Inductive Resonators and Waveguides

A flexible metamaterial RF detector for magnetic resonance imaging is described. The circuit consists of a polygonal arrangement of magnetically coupled L-C resonators with rectangular inductors, which supports magneto-inductive waves. The elements are mechanically linked to allow adjacent elements to rotate as the ring is flexed. The pivot is optimised to hold the nearest neighbour coupling coefficient κ1 invariant to small changes in angle so resonances are unaffected. Theory is developed to find the optimum pivot and verified using PCB elements. The method is also applicable to flexible waveguides.