Abstract: A wireless tag comprises a chip; an antenna; at least one conductive structure, the conductive structure and the chip being coupled by a common electrical connection to ground; and a filter electrically interposed along an electrical connection between the chip and the conductive structure; wherein the filter causes a reduction in amplitude of a signal passing between the conductive structure and the chip or an electrical disconnection between the conductive structure and the chip at around a prescribed frequency.

Abstract: An antenna for harvesting energy from frequency modulation radio signals are provided. An antenna for harvesting energy from frequency modulation (FM) radio signals includes a loop element coupled to an energy harvester; and an inductive element coupled to the loop element, wherein the inductive element is a planar inductor designed to allow impedance matching with the energy harvester, wherein the inductive element that extends an electric field of the loop element, wherein the loop element and the inductive element resonate at an FM frequency band.