Design of Dual-Mode X-Band Reflectarray for Defense Communication

Abstract

This paper presents the design and analysis of a passive X-band reflectarray metasurface operating across the 8−12GHz frequency range, intended for adaptive and robust communication in defense, security, and disaster response scenarios. The surface consists of uniformly spaced rectangular patch unit cells, with reflection phase control achieved by varying the length of one side of the patch, enabling geometrical phase mapping without the need for active tuning elements. Designed for fixed −30∘ reflection, the metasurface demonstrates high-gain directional performance and angular stability from 9 GHz to 11 GHz, with peak gain observed near 10 GHz. At 8 GHz and 12 GHz, the surface exhibits vortexshaped radiation patterns, highlighting its dual-mode capability. Such vortex beams, characterized by orbital angular momentum (OAM), can be exploited for multiplexed communication channels or anti-jamming links in military networks. The proposed design offers key advantages for military communication systems, including low profile, wide bandwidth, and dynamic beam shaping-all without the need for active circuitry or mechanical reconfiguration. Full-wave simulations confirm the reflectarray's wideband behavior, making it a lightweight and cost-effective solution for rapidly deployable high-gain antenna platforms in mission-critical scenarios.