Abstract
Electrically small dielectric antennas are of great interest for modern technologies, since they can significantly reduce the physical size of electronic devices for processing and transmitting information. We investigate the influence of the resonance conditions of an electrically small dielectric spherical antenna with a high refractive index on its directivity and analyze the dependence of these resonances on the effectively excited modes of the dielectric sphere.
Highlights
In this work we analyzed a directivity of an electrically small spherical Dielectric resonator antenna (DRA) excited by a point electric dipole and its dependence on the effectively excited modes of the spherical DRA
We demonstrated the applicability of jl(ζls = η1kR1) 0 condition for η1 1 regime to identify and characterize excited modes of a sphere
Maximum directivity of considered DRAs can be achieved at ζ3s resonances
Summary
The first antennas based on the use of a dielectric resonator appeared at the end of the last century. In order to achieve a directional scattering, it is necessary that the emission frequency of an electric dipole is close to one of the resonant frequency. We use the following notation here: the dipole position, rd; radius of the spherical dielectric antenna, R1; a homogeneous isotropic concentric domain, Ω1; refractive index of the sphere, η1 ≥ 1; refractive index of the surrounding medium, η2 = 1 (in the domain Ω2).
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