volume | PIER Journals

Abstract

A reconfigurable reflectarray antenna (RRA) is proposed with beam steering capability at 1.1 THz. The element of reflectarray is composed of vanadium dioxide (VO-2) and a gold bilayer model designed on a unit cell of 0.45λ, in which temperature variations produce different reflection phases due to the dependence of VO-2 on ambient conditions. The proposed reflectarray antenna has an aperture of 3100 μm and when particular cells of the array are exposed to temperature over 340K, it causes the phase in those unit cells to alter, eventually acting as 1-bit RRA. The radiation pattern shows a maximum gain of 24.3 dBi and a sidelobe level of -14.4 dB with an aperture efficiency of 21.7%. The maximum gain in case of offset is over 21 dBi with side lobe levels less than -10 dB up to 80-degree beam steering range. The proposed reconfigurable reflectarray antenna shows a beam steering capability of up to 100 degrees, which is sufficient for indoor communications. The designed antenna with its performance is optimum for the development of 6G RIS-based communication systems.

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Dr. Suhail Asghar Qureshi

Dr. Muhammad Ramlee Kamarudin

Dr. Muhammad Inam Abbasi

Prof. Yoshihide Yamada

Dr. Muhammad Hashim Dahri

Dr. Zuhairiah Zainal Abidin

Dr. Nordin Ramli