Metasurface Absorber-Based Circularly Polarized Antenna for 5G Mmwave Applications

This paper describes a metasurface (MS) absorberbased circularly polarized (CP) antenna for 5 G mmWave applications. A simple circular notched edge antenna with rectangular slot and “+ “-shaped slot on the ground plane operating at the fundamental mode of the desired frequency band is utilized. Additionally, rectangular patch-based MS is designed to operate at the same fundamental mode as the antenna, and the MS is positioned above the antenna at a specified distance to achieve the desired 3-dB axial ratio bandwidth (ARBW) and a 2.2-dBi gain enhancement while maintaining an appropriate size of 30 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\times 36 \times 0.254 \text{mm}^{3}$</tex>. The antenna achieved impedance bandwidth <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\left(\left\vert \mathrm{S}_{11}\right\vert \leq-10 \text{dB}\right)$</tex> without MS from 27.18 GHz up to 28.63 GHz and realized a gain of around 4.8 dBi at 28 GHz. The antenna with MS achieved an impedance bandwidth (IBW) from 27.00 GHz up to 29.20 GHz and realized a gain of around 7.0 dB at 28 GHz, and radiation efficiency above of 80 %. The proposed antenna is a potential candidate for upcoming 5 G applications.