Sequential Rotation Feeding Networks for Circularly Polarized Patch Antenna Arrays in the ISM Band

Abstract

The escalating demand for high-speed wireless communication, crucial for modern applications such as multimedia streaming and data transfer, necessitates the development of advanced antenna solutions. This article presents the design and characterization of an optimized printed circuit antenna array specifically tailored for WiFi and ISM band applications, aiming to address the inherent limitations of narrow bandwidth and modest gain typically associated with cost-effective, lightweight antenna designs. Through an optimized array configuration, we demonstrate enhanced performance metrics vital for future wireless systems.A compact 2×2 circularly polarized (CP) patch antenna array is detailed, which is not only suitable for general wireless communication but also for emerging applications like wireless power transfer in the ISM band. A key innovation lies in the implementation of a sequential rotation feeding network, which integrates a sequential phase shifter. This sophisticated feeding technique enables the design to achieve significantly improved circular polarization purity, wider impedance and axial ratio bandwidths, and an optimized reflection coefficient when compared to existing antenna array structures.