A New Wideband Circularly Polarized Dielectric Resonator Antenna Loaded with Strips

Lichao Hao,Wenting Yin,Hao Wang,Bo Li,Renato Cicchetti

doi:10.1155/2021/9966495

Abstract

This paper proposes a novel wideband circularly polarized (CP) dielectric resonator antenna (DRA) loaded with strips. The CP DRA comprises a circular DR, two pairs of driven L-like DR strips with different lengths, and a square ground-plane. To couple the electromagnetic energy to circular DR, an orthogonal cross-slot is used, and a stepped microstrip-line is also used to adjust the impedance matching. Influenced by the concept of deformed DR, two pairs of L-like DR strips of different lengths are inserted into the circular DR as part of the driven element to excite a new axial ratio (AR) resonant point. An antenna prototype is simulated, manufactured, and measured to validate the unique design. The measured results show that the designed antenna has broadband characteristic with a −10 dB IBW of 54% (1.91–3.32 GHz) and 3 dB ARBW of 42.1% (2.10–3.22 GHz).

Highlights

dielectric resonator antenna (DRA) [1, 2] have been intensively studied due to the attractive features of high efficiency, low cost, and wideband operation. e basic characteristics of DRAs in higher-order mode, circularly polarized (CP) dual-function and transparent designs, and a glass decoration DRA are described in [1] for the first time
Influenced by the concept of deformed DR, in this study, two pairs of driven L-like DR strips of different lengths are introduced into a circular DR as part of the driven element for enhancing the CP bandwidth (CPBW)
Note that the measured −10 dB impedance bandwidth (IBW) completely covers the whole 3 dB axial ratio bandwidth (ARBW), implying that usable overlapping bandwidth is more than 42%

Summary

Introduction

DRAs [1, 2] have been intensively studied due to the attractive features of high efficiency, low cost, and wideband operation. e basic characteristics of DRAs in higher-order mode, CP dual-function and transparent designs, and a glass decoration DRA are described in [1] for the first time. Except for using different single-feeding structures, various DR shapes [18,19,20,21,22,23,24,25], such as multiple-circular-sector [18], pixelated [19], and spidron-fractal shapes [20], have been designed to increase the CP bandwidth (CPBW) of DRAs. Rectangular and cylindrical rings and hemispherical DRs are introduced sequentially in [23,24,25], which can International Journal of Antennas and Propagation obtain 27.7%, 6.4%, and 3.9% 3 dB axial ratio bandwidth (ARBW), respectively.

Results

Conclusion