Microwave superdirectivity with dimers of helical elements
Petrov, P; Hibbins, A; Sambles, J
Date: 6 April 2020
Journal
Physical Review Applied
Publisher
American Physical Society
Publisher DOI
Abstract
Superdirective end-fire radiation in the low GHz frequency range is demonstrated using magnetically-coupled structures of subwavelength
metallic helices. Numerical, experimental and analytical results are presented on superdirective dimers that are almost three times smaller
compared to previously demonstrated dimers of split-ring-resonators ...
Superdirective end-fire radiation in the low GHz frequency range is demonstrated using magnetically-coupled structures of subwavelength
metallic helices. Numerical, experimental and analytical results are presented on superdirective dimers that are almost three times smaller
compared to previously demonstrated dimers of split-ring-resonators (0.09λ compared with 0.25λ) and provide close to theoretical maximum
values of directivity without using complex feeding networks. The size, directivity, efficiency and operational passband width of such
structures is optimized.
Physics and Astronomy
Faculty of Environment, Science and Economy
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