Abstract
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.
Original language | English (US) |
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Article number | 6576211 |
Pages (from-to) | 5425-5434 |
Number of pages | 10 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 61 |
Issue number | 11 |
DOIs | |
State | Published - 2013 |
Externally published | Yes |
Keywords
- Bessel beams
- Evanescent waves
- Metamaterials
- Metasurfaces
- Near field
- Near-field focusing
ASJC Scopus subject areas
- Electrical and Electronic Engineering