Broadband slant-polarized series-fed microstrip patch antenna array based on magnetic current feeding technology

This paper introduces a broadband 45° slant dual-polarized series-fed microstrip patch antenna array with low VSWR, based on magnetic current feeding technology. Conductive strips connect the radiating elements, minimizing out-of-phase currents to improve broadside directivity. A ring resonator is introduced by slotting the microstrip line, adding new resonant frequency bands, while the feed network design enables the formation of radiation modes similar to a magnetic current-fed array. The series-fed array’s wide bandwidth is achieved by combining the fundamental mode of side-shorted microstrip patch antennas with additional modes from the feed structure. A fabricated three-element linear array with central feeding demonstrated an impedance bandwidth of 3–6 GHz (67%) and a minimumVSWR of 1.007, offering simple feeding and low loss. This design is well-suited for applications requiring high directivity and dual polarization, such as 5G communication, drones, radar systems, satellite communications, and IoT networks.