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Ubiquitous computing is foreseen to play an important role for data production and network connectivity in the coming decades. The Internet of Things (IoT) research which has the capability to encapsulate identification potential and sensing capabilities, strives toward the objective of developing seamless, interoperable, and securely integrated systems which can be achieved by connecting the Internet with computing devices. This gives way for the evolution of wireless energy harvesting (EH) and power transmission using computing devices. Radio frequency (RF) based energy management (EM) has become the backbone for providing energy to wireless integrated systems. The two main techniques for EM in RF identification sensor networks (RSN) are EH and energy transfer (ET). These techniques enable the dynamic energy level maintenance and optimization as well as ensuring reliable communication which …