Abstract
A one-eighth spherical surface dielectric resonator antenna (OESS-DRA) is proposed first time. To analyze this thin shell structure, electromagnetic fields distribution is discussed by using the Hertz vector and boundary conditions. We simplify the solution of Maxwell equations by using Hertz vector because the polarization current is primary in the OESS-DRA. The Hertz vector can be expressed the current better. This proposed antenna is composed of one-eighth spherical dielectric shell fed by coaxial probe; and the ground with metal-corner-reflector makes the antenna with high gain and directional radiation properties. To verify this design, a fabricated sample is tested; results show the antenna covering bandwidth 4.56-6.88GHz, a high gain greater than 9.5dBi (peak gain 11.8dBi at 5.0GHz), and a high radiation efficiency over 85% in the entire working frequency band, as well. The OESS-DRA can be a good candidate in 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> generation communication applications.
Highlights
The hemispherical shaped dielectric resonator is one of the most basic geometries which can be used to design dielectric resonator antenna (DRA)
The probe length is about a quarterwavelength: l = c 4f where l is the length of the coaxial probe, f is the center frequency
What’s more, the radiation efficiency of the antenna is greater than 85% in the entire working frequency band
Summary
The hemispherical shaped dielectric resonator is one of the most basic geometries which can be used to design dielectric resonator antenna (DRA). If it is fed by a coaxial probe and adds rectangular reflector in its open side, its radiation pattern is directional as shown, but its gain is not good enough. The OESS-DRA is working under HEM mode, and the result of the theoretical analysis is verified
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