Superdirectivity from arrays of strongly coupled meta-atoms
We explore the possibility of achieving superdirectivity in metamaterial-inspired endfire antenna arrays relying on the good services of magnetoinductive waves. These are short-wavelength slow waves propagating by virtue of coupling between resonant meta-atoms. Magnetoinductive waves are capable of...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
AIP Publishing
2018
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| _version_ | 1826301408169689088 |
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| author | Radkovskaya, A Kiriushechkina, S Vakulenko, A Petrov, P Solymar, L Li, L Vallecchi, A Stevens, C Shamonina, E |
| author_facet | Radkovskaya, A Kiriushechkina, S Vakulenko, A Petrov, P Solymar, L Li, L Vallecchi, A Stevens, C Shamonina, E |
| author_sort | Radkovskaya, A |
| collection | OXFORD |
| description | We explore the possibility of achieving superdirectivity in metamaterial-inspired endfire antenna arrays relying on the good services of magnetoinductive waves. These are short-wavelength slow waves propagating by virtue of coupling between resonant meta-atoms. Magnetoinductive waves are capable of providing a rapidly varying current distribution on the scale of the free space wavelength. Using dimers and trimers of magnetically coupled split ring resonators with only one element driven by an external source, we introduce an analytical condition for realising superdirective current distributions. Although those current distributions have been known theoretically for a good 60 years, this is the first time that a recipe is given to realise them in practice. Our key parameters are the size of the array, the resonant frequency and quality factor of the elements, and their coupling constant. We compare our analytical results for coupled magnetic dipoles with numerical results from CST simulations for meta-atoms of various shapes. The calculated bandwidth of 5 MHz for a dimer operating at 150 MHz indicates that, contrary to popular belief, superdirective antennas exist not only in theory but may have practical applications. |
| first_indexed | 2024-03-07T05:31:58Z |
| format | Journal article |
| id | oxford-uuid:e2936180-14df-4c85-8270-965c9b686441 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:31:58Z |
| publishDate | 2018 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:e2936180-14df-4c85-8270-965c9b6864412022-03-27T10:02:28ZSuperdirectivity from arrays of strongly coupled meta-atomsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e2936180-14df-4c85-8270-965c9b686441EnglishSymplectic Elements at OxfordAIP Publishing2018Radkovskaya, AKiriushechkina, SVakulenko, APetrov, PSolymar, LLi, LVallecchi, AStevens, CShamonina, EWe explore the possibility of achieving superdirectivity in metamaterial-inspired endfire antenna arrays relying on the good services of magnetoinductive waves. These are short-wavelength slow waves propagating by virtue of coupling between resonant meta-atoms. Magnetoinductive waves are capable of providing a rapidly varying current distribution on the scale of the free space wavelength. Using dimers and trimers of magnetically coupled split ring resonators with only one element driven by an external source, we introduce an analytical condition for realising superdirective current distributions. Although those current distributions have been known theoretically for a good 60 years, this is the first time that a recipe is given to realise them in practice. Our key parameters are the size of the array, the resonant frequency and quality factor of the elements, and their coupling constant. We compare our analytical results for coupled magnetic dipoles with numerical results from CST simulations for meta-atoms of various shapes. The calculated bandwidth of 5 MHz for a dimer operating at 150 MHz indicates that, contrary to popular belief, superdirective antennas exist not only in theory but may have practical applications. |
| spellingShingle | Radkovskaya, A Kiriushechkina, S Vakulenko, A Petrov, P Solymar, L Li, L Vallecchi, A Stevens, C Shamonina, E Superdirectivity from arrays of strongly coupled meta-atoms |
| title | Superdirectivity from arrays of strongly coupled meta-atoms |
| title_full | Superdirectivity from arrays of strongly coupled meta-atoms |
| title_fullStr | Superdirectivity from arrays of strongly coupled meta-atoms |
| title_full_unstemmed | Superdirectivity from arrays of strongly coupled meta-atoms |
| title_short | Superdirectivity from arrays of strongly coupled meta-atoms |
| title_sort | superdirectivity from arrays of strongly coupled meta atoms |
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