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This article covers RF energy collection system basics. This radio frequency journaling is useful to charge the battery. Following are the energy harvesting schemes. This sort of energy harvesting uses radiations from RF sources such as radio and Television broadcasting transmitter channels, cellular base stations, communication satellites etc. Radio Frequency waves is part of spectrum. Maximum power accessible RF energy harvesting is 0.7 Watt for 2.4GHz and approximately 1 Watt for 900 MHz frequency. This might be accomplished with space distance of approximately 40meters. RF energy - RF energy system's block diagram. Figure also mentions different circuit parts utilized in these modules. Antenna - Matching Network - more or Voltage one - Energy storage systems - Antenna: This device collects the RF radiations from several sources out there from the space. The energy structures that are guided or is guided utilizing transmission line. Kinetic energy harvested into elecrical signs is converted by antenna. Refer types of antenna. Matching Network: It is used to the circuit to couple maximum RF energy. The circuit is made of inductor and capacitor parts. Multiplier: Figure mentions rectifier or multiplier made of capacitors and diodes. Higher are these stages lesser is the current and higher is the voltage in the load. But higher number of phases result to increase from charging delay before it goes to get energy storage. Refer halfwave and full wave rectifier systems. Energy storage: The direct current obtained from that the previous module is stored in either that the capacitor or passed to that the battery in order to conserve for afterwards use. Benefits of RF energy journaling - Following are the advantages from RF energy harvesting: Works from dark locations also. Provides power on demand and even from mobility conditions. Provides tracking capabilities. Can advantages in electric tariffs. Could work as secondary battery during the journey - Other energy journaling techniques - Refer Power Harvesting Methods which describes types and principles of energy journaling techniques and energy journaling materials.