Generation of High-Gain Steered Beam using Dipole Antenna Loaded on Anomalous Reflector with Near-field Correction

• Published in: 2024 IEEE Wireless Antenna and Microwave Symposium (WAMS) pp. 1 - 5
• Main Authors: G, Dheeraj, Badadal, Sateesh S., Appajappa, Mahesh, Sarkar, Debdeep
• Format: Conference Proceeding
• Language: English
• Published: IEEE 29.02.2024
• Subjects: Anomalous Reflectors; Beam Steering; Coded Metasurface; Dipole antennas; Intelligent Reflective Surfaces (IRS); Microwave antennas; Microwave theory and techniques; Phase Gradient; Printed Dipole; Reflector antennas; Surface impedance; Vehicular ad hoc networks; Wireless communication
• DOI: 10.1109/WAMS59642.2024.10527803

In this paper, a binary coded anomalous reflector with near-field correction technique is proposed for generation of directive beam from a dipole antenna. The proposed anomalous reflector of dimension 10\lambda_{0}\times 10\lambda_{0} operates at f=5.9GHz and is capable of simultaneously correcting for near-field effects, while characteristically bearing a phase gradient to steer the main beam towards a designed angle of 45^{\mathrm{o}} . First, the phase gradient for far-field incidence is computed using generalised Snell's law. Next, the phase gradient is modified accordingly to correct the near-field effects due to the radiator placed at \lambda_{0}/4 above the anomalous reflector. The proposed anomalous reflector is designed on an FR-4 substrate. The primary radiator is a printed dipole with integrated balun matched to 50 \Omega . The dipole is designed on RT Duroid substrate of thickness 0.508mm. The placement of dipole with anomalous reflector along two orientations is studied for Gain and HPBW, and is compared to a dipole with PEC bearing the same dimensions. The dipole is individually optimised with both the PEC and the anomalous reflector to achieve optimum S_{11} and impedance matching. For the anomalous reflector with dipole, a peak gain of 14.8 dBi is observed while consequently steering the beam at 45^{\mathrm{o}} . The proposed dipole backed with near-field corrected anomalous reflector can be employed in applications like Vehicle to Vehicle (V2V) or Vehicle to Everything (V2X) networks.