A Single-Feed Wideband Circularly Polarized Dielectric Resonator Antenna Using Hybrid Technique With a Thin Metasurface

oleh: Arslan Kiyani, Nasimuddin Nasimuddin, Raheel M. Hashmi, Affan Aziz Baba, Syed Muzahir Abbas, Karu P. Esselle, Abdelhady Mahmoud

Format: Article
Diterbitkan: IEEE 2022-01-01

Deskripsi

A compact metasurface-based circularly polarized (CP) dielectric resonator antenna (DRA) is proposed with wideband characteristics. The antenna forms a very simple structure, composed of a rectangular DR, a single coaxial probe, and plus-shaped unit cells-based metasurface. The metasurface is realized on a grounded FR-4 substrate. Next, a rectangular DR is loaded centrally over the metasurface. The DR is fed with a perturbed probe feed at an appropriate angle of (<inline-formula> <tex-math notation="LaTeX">$\theta $ </tex-math></inline-formula>&#x003D;29&#x00B0;), along the diagonal line. Thus, a novel hybrid technique involving the angle of feed location from the center of DR, and the <italic>N</italic> <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> <italic>N</italic> unit cells-based metasurface is utilized for generating a wideband CP radiation. The resonance from the rectangular DR and surface waves along the <inline-formula> <tex-math notation="LaTeX">$7\times $ </tex-math></inline-formula> 7 plus-shaped unit cells-based metasurface is exploited to achieve a wide 3-dB axial ratio (AR) and impedance matching bandwidth. The fabricated antenna prototype used for the validation of predicted results confirms the successful implementation of the proposed technique. Measured results demonstrate a wide impedance bandwidth of 32&#x0025; (3.6 GHz - 7.0 GHz) and an overlapping 3-dB AR bandwidth of 20.4&#x0025; (4.2 GHz - 5.2 GHz). Moreover, the antenna adopts a left-hand circular polarization (LHCP) with 6&#x2013;7 dBic measured gain within the operational frequency range. Overall, the proposed antenna offers low-profile, simplicity, ease of design, and high performance.