Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 8, Issue -, Pages 421-424Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2009.2021495
Keywords
Corrugated surface; diffraction limit; focusing; metamaterials; near field
Funding
- Div Of Electrical, Commun & Cyber Sys [0747623] Funding Source: National Science Foundation
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In this letter, we present a theoretical device that can produce electromagnetic near-field patterns with deep subwavelength resolution. The device consists of a single slit in a corrugated metallic surface. The surface exhibits a nonperiodic series of grooves symmetrically positioned about a waveguide-fed slit. A procedure for designing such a device is described in detail. The electromagnetic response of the corrugated surface is shown to be as theoretically predicted, producing a subwavelength focal pattern with a null-to-null beamwidth of lambda/10. In addition, the effect of losses on the performance of the device is studied. Finally, it is shown that the device can be impedance-matched to its waveguide feed. Such devices will find use in noncontact sensing and near-field probing applications.
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