Circularly Polarized Rectangular Dielectric Resonator Antenna (CP-RDRA) Arrays withFractal Cross-Slot usingT-bend&Miter bend power divider feeding networks

Krishna RaoPedada; Satya Anuradha  M; Rajya Lakshmi V

doi:10.31838/

Authors

Krishna RaoPedada Assistant Professor,Department of ECE, Aditya Institute of Technology and Management, Tekkali
Dr. M. Satya Anuradha Department of ECE, Andhra University, Visakhapatnam
Dr. V. Rajya Lakshmi Professor, Department of ECE, ANITS, Visakhapatnam

DOI:

https://doi.org/10.31838/

Keywords:

Ultra-wideband, Circular polarization, Rectangular DRA array, Fractal cross-slot-Miter bend & T-power divider feeding, Return-loss, Radiation pattern, VSWR, Gain and Axial-ratio

Abstract

In the design of circularly polarized (CP) dielectric resonator antenna (DRA) arrays, the regular-shaped DRAs with simple feeding configurations are mostly used as array elements to make the design procedure more efficient. However, such an array element DRA usually achieves only about 6% axial ratio (AR) bandwidth. In this design, a CP DRA element coupled by a fractal cross-slot which can radiate efficiently and excite the rectangular DRA simultaneously is considered. By adjusting the dimensions of the fractal cross-slot properly, the resonances of the fractal cross-slot and the dielectric resonator can be merged to obtain a wider AR bandwidth. Based on the proposed fractal cross-slot-coupled CP DRA element, three different CP DRA arrays are designed: a 4 coupled DRA array of parallel power divider without T-bend, a 4 coupled DRA array of parallel power divider with Miter bend and a 4 coupled DRA array of 2 set power divider with Miter bend. The designed DRA arrays are fabricated and measured, and structures and performances of the arrays are presented and discussed.

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