Journal
PHYSICAL REVIEW B
Volume 104, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.195406
Keywords
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Funding
- Ministry of Science and Higher Education of the Russian Federation [075-152021-589]
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In a variety of applications, small form-factor, narrow band, and highly directive antennas play a critical role. The study demonstrates that the classical directivity limit can be significantly surpassed for electrically small multilayer spherical antennas even if using purely dielectric materials. Feasible designs of superdirective antennas are established through a stochastic optimization algorithm combined with a rigorous analytic solution.
Small form-factor, narrow band, and highly directive antennas are of critical importance in a variety of applications spanning wireless communications, remote sensing, Raman spectroscopy, and single photon emission enhancement. Surprisingly, we show that the classical directivity limit can be appreciably surpassed for electrically small multilayer spherical antennas excited by a point electric dipole even if limiting ourselves to purely dielectric materials. Experimentally feasible designs of superdirective antennas are established by using a stochastic optimization algorithm combined with a rigorous analytic solution.
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