Liberal Olleta, ÍñigoEderra Urzainqui, ÍñigoGonzalo García, RamónZiolkowski, Richard W.2017-08-042017-08-042013I. Liberal, I. Ederra, R. Gonzalo and R. W. Ziolkowski, "A Multipolar Analysis of Near-Field Absorption and Scattering Processes," in IEEE Transactions on Antennas and Propagation, vol. 61, no. 10, pp. 5184-5199, Oct. 2013. doi: 10.1109/TAP.2013.2272453.0018-926X10.1109/TAP.2013.2272453https://academica-e.unavarra.es/handle/2454/24936A multipolar formulation is adopted to investigate the absorption and scattering processes involved in near-field interactions. This approach allows one to determine the upper bounds for the absorbed and radiated powers that would be achieved by an ideal lossless sensor, which are of particular interest, for example, to wireless power transfer (WPT), wireless sensors and near-field coupled radiators. The multipolar formulation also helps to extricate the fundamental compromises that must be addressed in the design of such systems, as well as to identify strategies that could approach their best possible performances. The general theory is illustrated with an example consisting of a coated sensor illuminated by a Hertzian dipole, which is a representative example of any scattering or radiating system based on small resonators. The example also serves to compare the performance characteristics obtained with different phenomena such as multipolar resonances, phaseinduced interference effects and cloaking.17 p.application/pdfeng© 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.AbsorptionNear-field interactionsNear-field parasitic resonatorsScatteringSensorsWireless power transferinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess