Thermophotovoltaics: An alternative to and potential partner with rectenna energy harvesters

Abstract

A technology that can be used in place of, or in addition to, rectennas is thermophotovoltaics (TPVs). The ultimate function of TPVs, like that of the rectenna, is the conversion of electromagnetic radiation to DC current. Rectennas use a rectifying diode coupled with an antenna to achieve this conversion. TPVs achieve this conversion through a single diode which both receive the radiation and converts it to a current. While rectennas are superior at longer wavelengths (greater than 5 μm), TPVs are more efficient at shorter wavelengths (less than 5 μm). Although rectennas and TPVs have been investigated independently, a hybrid technology may be possible which incorporates components from both technologies.