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Abstract
The radiation characteristics of hemispherical DRA elements mounted on or embedded in a hollow circular cylindrical ground structure are investigated. The performance of the DRA array which operates at about 1.8 Ghz, is studied. Factors influencing the array performance, such as the number of elements and element spacing are explained. The perforated dielectric technique is used to design the array from a single dielectric sheet. The overall profile of the antenna can be significantly reduced. The radiation patterns with respect to the number of DRA elements are depicted.
Highlights
Cylindrical conducting surfaces with antennas fixed on top are widespread in different systems such as aerospace vehicles and satellites In these applications, the antenna radiation pattern is needed to be almost omnidirectional, and the antenna efficiency has to be high [1-4]
It can be seen that an increase in the number of hemispherical dielectric resonator antenna (DRA) antennas directly result in a better approximation of an omnidirectional pattern
The hemispherical DRA is designed to operate at 1.8 GHz. l the length of the circular cylindrical ground plane, “lg”, is 50 cm
Summary
Cylindrical conducting surfaces with antennas fixed on top are widespread in different systems such as aerospace vehicles and satellites In these applications, the antenna radiation pattern is needed to be almost omnidirectional, and the antenna efficiency has to be high [1-4]. The radiation characteristics of cylindrical and hemispherical DRAs placed on or embedded in circular cylindrical and spherical ground planes are investigated in [12-15]. The performance of the hemispherical DRA array elements mounted on or embedded in circular cylindrical ground plane for producing omnidirectional radiation pattern, which operates at about 1.8 GHz, is studied. The array performance is very much influenced by several factors, such as the number of elements and elements spacing These effects have been investigated in this work. It can be seen that an increase in the number of hemispherical DRA antennas directly result in a better approximation of an omnidirectional pattern. The radiation patterns with respect to the number of DRA elements are investigated based on the radiation characteristic. Numerical results are obtained using the finite element method (FEM) and compared with that calculated by the finite integration technique (FIT) for authentication
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