An electrosurgical energy delivery apparatus, comprising: an energy delivery circuit configured to receive an electrosurgical energy signal from an electrosurgical energy source, the electrosurgical energy signal having a primary frequency that generates a desired surgical effect, the energy delivery circuit configured to selectively provide the electrosurgical energy signal to an energy delivery element; a control circuit operatively connected to the energy delivery circuit and configured to selectively enable the flow of electrosurgical energy to the energy delivery element; and an energy-harvesting system including: a plurality of energy-harvesting circuits, each of the plurality of energy-harvesting circuits including: an energy-harvesting antenna tuned to a particular frequency; a matched circuit configured to receive an RF signal from the energy-harvesting antenna at the particular frequency, the matched circuit configured to rectify the RF signal and generate a DC signal; and an energy storage device configured to receive and store the DC signal; and a voltage regulator connected to the energy storage device and configured to provide a regulated DC voltage to at least one of the energy delivery circuit and the control circuit, wherein at least one of the plurality of energy-harvesting circuits is tuned to the primary frequency of the electrosurgical energy source. an energy delivery circuit configured to receive an electrosurgical energy signal from an electrosurgical energy source, the electrosurgical energy signal having a primary frequency that generates a desired surgical effect, the energy delivery circuit configured to selectively provide the electrosurgical energy signal to an energy delivery element; a control circuit operatively connected to the energy delivery circuit and configured to selectively enable the flow of electrosurgical energy to the energy delivery element; and an energy-harvesting system including: a plurality of energy-harvesting circuits, each of the plurality of energy-harvesting circuits including: an energy-harvesting antenna tuned to a particular frequency; a matched circuit configured to receive an RF signal from the energy-harvesting antenna at the particular frequency, the matched circuit configured to rectify the RF signal and generate a DC signal; and an energy storage device configured to receive and store the DC signal; and a voltage regulator connected to the energy storage device and configured to provide a regulated DC voltage to at least one of the energy delivery circuit and the control circuit, a plurality of energy-harvesting circuits, each of the plurality of energy-harvesting circuits including: an energy-harvesting antenna tuned to a particular frequency; a matched circuit configured to receive an RF signal from the energy-harvesting antenna at the particular frequency, the matched circuit configured to rectify the RF signal and generate a DC signal; and an energy storage device configured to receive and store the DC signal; and an energy-harvesting antenna tuned to a particular frequency; a matched circuit configured to receive an RF signal from the energy-harvesting antenna at the particular frequency, the matched circuit configured to rectify the RF signal and generate a DC signal; and an energy storage device configured to receive and store the DC signal; and a voltage regulator connected to the energy storage device and configured to provide a regulated DC voltage to at least one of the energy delivery circuit and the control circuit, wherein at least one of the plurality of energy-harvesting circuits is tuned to the primary frequency of the electrosurgical energy source.