Abstract
The results of work in the field of analysis of the distribution of electromagnetic fields generated by the antenna of an RFID reader operating in the UHF frequency band have been presented in this paper. The carried-out tests concern the efficiency of obtaining energy from the field of an electromagnetic RFID reader. To analyze the distribution of the electric field strength, the calculation procedures were elaborated on the basis of the developed mathematical dependencies in the MathCad program. The developed numerical procedures enable the synthesis of the electric field strength and power density distribution for a given antenna radiation pattern, for any suspension heights of the transmit and receive antennas and any mutual distance between them. In order to verify the correctness of calculations the test stands and measurements were made for a model antenna. The measurements were carried out in a semi-anechoic chamber.
Highlights
The results of the work presented in the paper concern the issue of electromagnetic harvesting and related aspects of obtaining energy from the electromagnetic field generated by the antenna of the RFID reader
The main aim of the conducted research was to determine the distribution of electric field strength and power density generated by the model RFID reader antenna, dedicated to operation in the UHF frequency band
In case that the environment in which electromagnetic waves are propagated is an ideal space where the wave is not reflected, the level of the electric field strength and the corresponding power density changes according to the dependence described by the Friis formula
Summary
The results of the work presented in the paper concern the issue of electromagnetic harvesting and related aspects of obtaining energy from the electromagnetic field generated by the antenna of the RFID reader. Such problems have been the subject of scientific research in recent years and will be reflected in referenced publications [1,2,3,4,5]. Considering the antenna-harvester system in single and multiple identification systems, the analysis can be limited to a one-dimensional problem (1D) In such a system, the antenna can be treated as a point source of energy and the harvester as its point receiver. This approach to the problem allows for simplification in balancing the energy that is available at a given point in space
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