A Detailed Study of Wideband Dual-Polarized Aperture-Coupled 1 × 4 Linear Antenna Array for Wi-Fi 8 Applications

Abstract

This research paper presents a compact wideband Dual-Polarized Antenna Element (W-DPAE) in a linear array configuration, specifically developed for Wi-Fi 8 applications operating within the 5.9-7.1 GHz band. The proposed design employs a multilayer structure that includes a radiating patch and a slotted ground, where aperture slots are arranged orthogonally, along with a Rohacell spacer of low permittivity that plays a significant role in enhancing bandwidth and electromagnetic coupling. By arranging both transmission lines orthogonally, dual polarization is achieved with high port isolation and proper impedance matching. All design parameters are carefully optimized to ensure stable radiation, wider bandwidth, and effective impedance matching over the operating frequency range. Without involving complex structures, stacked patches, or increasing the overall size, this single element achieves wideband dual polarization. Furthermore, for higher gain (dB) and capacity demands of next-generation wireless communication, the single element is extended to a $1 \times 4$ linear array using full-wave simulation in CST Microwave Studio Suite. The simulated results show that the $1 \times 4$ array achieves a gain of approximately 9 dBi for vertical polarization and 8 dBi for horizontal polarization. The proposed design is validated using CST Microwave Studio Suite, and its equivalent circuit model is developed using the Advanced Design System (ADS) simulator. The proposed antenna system offers compact implementation for user devices and high-gain array configurations for infrastructure, showing strong potential for next-generation Wi-Fi 8 networks demanding high data rates, improved connectivity, and spectral efficiency.