Abstract
This chapter deals with different types of suitable antennas for microwave and RF energy harvesting needed for the utilization of ubiquitous and abundant RF energy. Among the different types of antenna structures suitable for RF energy harvesting applications, namely, microstrip patch antenna, array antenna and ultra-wideband dielectric antenna are presented here in view of frequency bandwidth of operation, directive gain, radiated field patterns and physical antenna sizes. Here RF frequencies of interest for energy harvesting are chosen, viz. GSM, Wi-Fi, Bluetooth to satellite communication bands so that they cover relatively high-power RF sources. The targeted area of applications of this methodology may be in the devices with low power consumption, for devices requiring periodic switching on/off e.g. in some satellite communication applications, for medical applications with implantable devices where the usage of battery sources will make the device bulkier and thus unsuitable. Wherein relatively smaller energy harvesting circuitry with antennas may be a viable and more long-lasting option, giving the requisite boost to the self-sustainable IoT technologies.
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