Abstract
To achieve wideband circular polarization (CP) characteristics, a new structure with a single feeding technique has been proposed. In the proposed CP structure, to excite the cylindrical dielectric resonator (CDR) four asymmetrical rectangular slots are etched on the ground plane, each rectangular slot is rotated by an angle of ( θ = 30 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> ) with respect to its adjacent slots. The electric fields at each slot are separated by 30° in space with respect to its adjacent slot to create 90° angular separations between the E-field components. Two orthogonal broadside modes ( HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11δ</sub> ) are excited inside the cylindrical dielectric resonator antenna (CDRA) independently to obtained CP characteristics. To compare the simulated outcomes with the experimental results, fabrication of the proposed antenna prototype has been done. The measured percentage of bandwidth achieved by the proposed radiator for |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | and CP is 26.73% and 23.59%, respectively, and the whole usable axial ratio (AR) frequency bands overlap the impedance passband of the presented CP structure. The proposed radiator has achieved the maximum gain and radiation efficiency of 3.4 dB and 95% over the operating frequency range of the designed antenna, respectively. The proposed CP DRA has been configured for the WLAN band application.
Highlights
The inherent properties offered by dielectric resonator antenna (DRA) is found an appropriate selection for antenna designers due to its high radiation efficiency, small size, light weight, wideband, and excited with various feeding mechanisms [1, 2]
Polarized (CP) DRAs overcome the limitations of linearly polarized (LP) DRAs due to their remarkable features such as the Circularly polarized (CP) systems are insensitive to the problems of antenna misalignment and propagation effects, suppress multipath fading effect and better mobility in any weather condition [1,2,3,4,5]
Several feeding mechanisms are presented in the literature for CP operation in DRAs they are single-fed [6], dual or multi-point fed [7 - 9] and sequential rotation feeding technique [10, 11]
Summary
The inherent properties offered by dielectric resonator antenna (DRA) is found an appropriate selection for antenna designers due to its high radiation efficiency, small size, light weight, wideband, and excited with various feeding mechanisms [1, 2]. An innovative technique has been proposed for generating the CP wave by exciting the cylindrical DR with asymmetrical bow-tie shape slot along with off-centered microstrip feed without any modification in DR geometry or shape. These observations illustrate that the CP performance can be enhanced by single-point-fed regular-shaped DRAs by utilizing a proper feeding structure. Many wideband CP DRAs [12 - 15] are reported in the literature with complete overlapping between impedance and AR bandwidth but they are using complex DR geometry or shapes, multi-point feeding and large antenna dimensions due to that structures become very bulky and complex as compared to the proposed antenna
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