期刊
APPLIED PHYSICS LETTERS
卷 104, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4869817
关键词
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资金
- Ministry of Education and Science of the Russian Federation [11.G34.31.0020]
- Russian Foundation for Basic Research
- Dynasty Foundation (Russia)
- Australian National University
We propose and demonstrate experimentally a simple approach for achieving superdirectivity of emitted radiation for electrically small antennas based on a spherical dielectric resonator with a notch excited by a dipole source. Superdirectivity is achieved without using complex antenna arrays and for a wide range of frequencies. We also demonstrate the steering effect for a subwavelength displacement of the source. Finally, unlike previously known superdirective antennas, our design has significantly smaller losses, at the operation frequency radiation efficiency attains 80%, and matching holds in the 3%-wide frequency band without any special matching technique. (C) 2014 AIP Publishing LLC.
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