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<p>A compact circularly polarized (CP) multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) is designed for unmanned aerial vehicle (UAV) applications, which require high data transfer rates, wide coverage, and robust performance. The suggested antenna operates over a broad bandwidth of 8.4&#xa0;GHz (7.5–15.9&#xa0;GHz), providing circular polarization across two bands with 3-dB axial ratio bandwidths (ARBWs) of 32% (8.4–11.6&#xa0;GHz) and 13.2% (13.4–15.3&#xa0;GHz). A novel defected ground structure (DGS) method is utilized to significantly improve both impedance bandwidth (IBW) and ARBW, enabling superior matching and polarization purity. The antenna achieves an elevated radiation efficiency of 99.02%, along with an excellent gain of 13.85 dBi, making it well-suited for high-performance UAV communication systems that demand compact size, low cost, and wideband operation. The design leverages the inherent advantages of DRAs, such as low losses and high radiation efficiency, making it an optimal solution for modern UAVs requiring reliable, high-capacity data links with minimal interference.</p>

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A Compact Circularly Polarized MIMO DRA for UAV Applications

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Patri Upender,
  • Amarjit Kumar

摘要

A compact circularly polarized (CP) multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) is designed for unmanned aerial vehicle (UAV) applications, which require high data transfer rates, wide coverage, and robust performance. The suggested antenna operates over a broad bandwidth of 8.4 GHz (7.5–15.9 GHz), providing circular polarization across two bands with 3-dB axial ratio bandwidths (ARBWs) of 32% (8.4–11.6 GHz) and 13.2% (13.4–15.3 GHz). A novel defected ground structure (DGS) method is utilized to significantly improve both impedance bandwidth (IBW) and ARBW, enabling superior matching and polarization purity. The antenna achieves an elevated radiation efficiency of 99.02%, along with an excellent gain of 13.85 dBi, making it well-suited for high-performance UAV communication systems that demand compact size, low cost, and wideband operation. The design leverages the inherent advantages of DRAs, such as low losses and high radiation efficiency, making it an optimal solution for modern UAVs requiring reliable, high-capacity data links with minimal interference.