Abstract
In this paper, the design of a wideband circularly polarized (CP) bowtie slot antenna that uses metasurfaces is presented. The antenna consists of a single-layer substrate with 4 × 4 periodic corner-truncated metasurface patches printed at the top side of the substrate and a bowtie-shaped slot etched on the ground plane. The corner-truncated metasurface patches are utilized to convert the linearly polarized wave into a CP wave. The antenna is fed by a 50-Ω coplanar waveguide. The antenna, with an overall size of 42 mm × 42 mm × 2.3 mm (0.71 λo × 0.71 λo × 0.038 λo at 5.1 GHz), was fabricated and measured. The measured reflection coefficient for |S11| < -10 dB yielded an impedance bandwidth of 3.75–6.67 GHz (55.7%), an axial ratio (AR) bandwidth of 4.38–5.98 GHz (31.37%), a 3-dB gain bandwidth of 3.75–6.0 GHz (46.88%), a peak gain of 7 dBic, and a high radiation efficiency of more than 93% within the AR bandwidth.
Highlights
In recent years, metamaterials have attracted considerable attention and have been applied to antennas to enhance performance due to their unique abilities to manipulate and produce electromagnetic waves that are unusual or difficult to obtain in nature [1]–[3]
This paper proposes a novel method of achieving wide impedance and axial ratio (AR) bandwidths by using a modified bowtie wide slot antenna and coupling it with a conventional wideband linear polarized (LP)-to-circularly polarized (CP) polarization converter
This paper presents a low-profile wideband CP stepped bowtie slot antenna that uses corner-truncated metasurface patches for the polarization conversion from an LP wave to a CP wave
Summary
Metamaterials have attracted considerable attention and have been applied to antennas to enhance performance due to their unique abilities to manipulate and produce electromagnetic waves that are unusual or difficult to obtain in nature [1]–[3]. In [18], the authors proposed a metasurface structure consisting of four unit cells with parasitic square cross-gaps arranged in a 2 × 2 layout for LP to CP polarization conversion They achieved a low profile and wide impedance bandwidth (39.35%), yet the AR. An S-shaped metasurface polarization converter for LP to CP wave conversion was presented in [21] Both antennas achieved wide impedance and AR bandwidths. With polarization converters using slot antennas as an LP source [16]–[21], the authors employed narrow-width slot antennas Even though they employed wideband circularly polarized metasurface patches, they obtained narrow impedance and AR bandwidths. This paper presents a low-profile wideband CP stepped bowtie slot antenna that uses corner-truncated metasurface patches for the polarization conversion from an LP wave to a CP wave. The antenna dimensions are 42 mm × 42 mm × 2.3 mm (0.71 λo × 0.71 λo × 0.038 λo at 5.1 GHz)
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