Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 61, Issue 11, Pages 5425-5434Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2013.2277564
Keywords
Bessel beams; evanescent waves; metamaterials; metasurfaces; near field; near-field focusing
Funding
- Presidential Early Career Award for Scientists and Engineers [FA9550-09-1-0696]
- NSF [ECCS-0747623]
- NSF Materials Research and Engineering Center program [DMR 1120923]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0747623] Funding Source: National Science Foundation
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This paper presents planar near-field plates that can tailor the electromagnetic near field and produce desired subwavelength focal patterns. These plates consist of concentric annular slots on a circular grounded dielectric slab excited through a coaxial connector. The annular slots are loaded with lumped element impedances which are designed to produce a prescribed subwavelength focal pattern. The procedure to design such plates is outlined. The designed plates are studied through full-wave simulation and the generation of desired subwavelength patterns is demonstrated. Several near-field plates are also fabricated and measured. It is shown that the experimental near-field patterns are in close agreement with simulation. Furthermore, experiments confirming the planar near-field plates ability to tailor the electromagnetic near field are presented. Planar near field plates may find application in near-field imaging and probing systems, biomedical targeting devices, and high density data storage.
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