A tuned resonant circuit including inductive and capacitive components useful as a marker in electronic marker surveillance systems, comprising a laminate of a dielectric and conductive-multi-turn spirals on opposing surfaces of the dielectric, wherein the capacitive component is formed as a result of...http://www.google.fr/patents/US4578654?utm_source=gb-gplus-shareBrevet US4578654 - Distributed capacitance lc resonant circuit
