Wide Band Beam Steering Digital Metasurface Reflectarray Antenna for Millimeter Wave Applications

A compact wideband digital metasurface reflectarray antenna for millimeter-wave application is presented in this article. The metasurface reflectarray is composed of periodic arrangements of metabit unit cell elements. The metabit consists of a dipole with end stub loading, exhibiting wideband refle...

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Bibliographic Details
Published in:IEEE access 2023, Vol.11, p.121800-121810
Main Authors: Bashir, Gazali, Singh, Amit K., Dubey, Ankit
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Beam scanning
Beam steering
Broadband
digital metasurface
Dipoles
Directive antennas
Extremely high frequencies
Gain measurement
High gain
high gain millimeter-wave antenna
Horn antennas
Metasurfaces
Military applications
Millimeter wave communication
Millimeter waves
Quantization (signal)
reflectarray antenna
Reflection
Reflector antennas
Unit cell
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Summary:A compact wideband digital metasurface reflectarray antenna for millimeter-wave application is presented in this article. The metasurface reflectarray is composed of periodic arrangements of metabit unit cell elements. The metabit consists of a dipole with end stub loading, exhibiting wideband reflection characteristics. The metabit is quantized to generate two discrete reflection phase levels, resulting in binary states of 0 and 1, respectively. The binary bits are distributed over the reflector surface using uniform phase quantization to achieve a highly directive beam in the desired direction. A digital metasurface reflector array composed of 20\times20 metabits is analyzed, fabricated, and characterized. The digital reflector is illuminated by a Ka-band horn antenna placed at a miniaturized focal point, resulting in compactness with high gain. The specialized digital coding sequence on the reflector surface results in a highly directive beam towards 0°, ±15°, and ±30° operating in the frequency band of 26 GHz - 35 GHz with a maximum achievable gain of 21.5 dBi. The measured results of the digital metasurface reflectarray antenna depict the wideband characteristics of having a 3 dB gain bandwidth of 29.5% and a peak aperture efficiency of 30%in the frequency band of 26 GHz - 35GHz. The proposed digital metasurface reflectarray antenna finds its application in millimeter-wave communications such as 5G and beyond, satellite, and defense applications.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2023.3328564