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<https://discovery.ucl.ac.uk/id/eprint/10074068> <http://purl.org/dc/terms/title> "Optimization of Far-Field Radiation From Impedance-Loaded Nanoloops Accelerated by an Exact Analytical Formulation"^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/10074068> <http://purl.org/ontology/bibo/abstract> "Impedance loading is a common technique\r\ntraditionally used in the RF to enhance the performance of an\r\nantenna, but its application in the optical regime is not as\r\nrigorously studied. This is mainly due to a lack of exact analytical\r\nexpressions that can be used to rapidly predict the radiation\r\nproperties of loaded nanoantennas. This paper will derive a set of\r\nuseful analytical expressions for the far-field radiation properties\r\nof loop antennas loaded with an arbitrary number of lumped\r\nimpedances that are valid from the RF to optical regimes. The\r\nanalytical expressions will be validated with full-wave solvers and\r\ncan be evaluated more than 100x faster. The ability to perform\r\nsuch rapid evaluations enables, for the first time, large-scale\r\nsingle- and multi-objective optimizations. A series of optimizations\r\nreveal that electrically small super-directive antennas can be\r\nachieved at a variety of far field angles through capacitive loading,\r\npaving the way for a pattern reconfigurable antenna. In addition,\r\ngains of greater than 3 dB can be achieved for electrically small\r\nantennas over a fractional bandwidth of 28%. Finally, it is shown\r\nthat impedance loading can be used to achieve circularly polarized\r\nradiation from a single loop."^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/10074068> <http://purl.org/dc/terms/date> "2019-03" .
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