Coherently Driven and Superdirective Antennas
Antennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power tra...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-07-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/8/8/845 |
| _version_ | 1798034588082110464 |
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| author | Alex Krasnok |
| author_facet | Alex Krasnok |
| author_sort | Alex Krasnok |
| collection | DOAJ |
| description | Antennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power transfer (WPT) and superdirective dielectric antennas. We show that the concept of coherently enhanced WPT allows improvement of the antenna receiving efficiency by coherent excitation of the outcoupling waveguide with a backward propagating guided mode with a specific amplitude and phase. Antennas with the superdirectivity effect can increase the WPT system’s performance in another way, through tailoring of radiation diagram via engineering antenna multipoles excitation and interference of their radiation. We demonstrate a way to achieve the superdirectivity effect via higher-order multipoles excitation in a subwavelength high-index spherical dielectric resonator supporting electric and magnetic Mie multipoles. Thus, both types of antenna discussed here possess a coherent nature and can be used in modern intelligent antenna systems. |
| first_indexed | 2024-04-11T20:46:22Z |
| format | Article |
| id | doaj.art-7a4d06e9baf644dc89f74b120e5efb26 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-04-11T20:46:22Z |
| publishDate | 2019-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-7a4d06e9baf644dc89f74b120e5efb262022-12-22T04:04:02ZengMDPI AGElectronics2079-92922019-07-018884510.3390/electronics8080845electronics8080845Coherently Driven and Superdirective AntennasAlex Krasnok0Advanced Science Research Center, City University of New York, New York, NY 10031, USAAntennas are crucial elements for wireless technologies, communications and power transfer across the entire spectrum of electromagnetic waves, including radio, microwaves, THz and optics. In this paper, we review our recent achievements in two promising areas: coherently enhanced wireless power transfer (WPT) and superdirective dielectric antennas. We show that the concept of coherently enhanced WPT allows improvement of the antenna receiving efficiency by coherent excitation of the outcoupling waveguide with a backward propagating guided mode with a specific amplitude and phase. Antennas with the superdirectivity effect can increase the WPT system’s performance in another way, through tailoring of radiation diagram via engineering antenna multipoles excitation and interference of their radiation. We demonstrate a way to achieve the superdirectivity effect via higher-order multipoles excitation in a subwavelength high-index spherical dielectric resonator supporting electric and magnetic Mie multipoles. Thus, both types of antenna discussed here possess a coherent nature and can be used in modern intelligent antenna systems.https://www.mdpi.com/2079-9292/8/8/845antennascoherently driven antennassuperdirective antennas |
| spellingShingle | Alex Krasnok Coherently Driven and Superdirective Antennas Electronics antennas coherently driven antennas superdirective antennas |
| title | Coherently Driven and Superdirective Antennas |
| title_full | Coherently Driven and Superdirective Antennas |
| title_fullStr | Coherently Driven and Superdirective Antennas |
| title_full_unstemmed | Coherently Driven and Superdirective Antennas |
| title_short | Coherently Driven and Superdirective Antennas |
| title_sort | coherently driven and superdirective antennas |
| topic | antennas coherently driven antennas superdirective antennas |
| url | https://www.mdpi.com/2079-9292/8/8/845 |
| work_keys_str_mv | AT alexkrasnok coherentlydrivenandsuperdirectiveantennas |