A Novel Base Station Antenna Array With Electromagnetic Transparent Radiator

This paper introduces a novel antenna element with electromagnetic transparency designed for a shared-aperture base station antenna. Drawing inspiration from the wide-angle bandpass frequency selective surface element, triangular patches are incorporated onto a square ring to modify the passband. Utilizing the proposed element as the dipole for the low-frequency band (LB) antenna and adjusting the size of the triangular patches can achieve electromagnetic transparency in the band of 3.2-3.8 GHz. The proposed dual-band dual-polarized shared-aperture antenna array operates in the LB of 1.6-2.1 GHz and the high-frequency band (HB) of 3.2-3.8 GHz. Simulation findings indicate a significant decrease in cross-band scattering within the dual-band array, and the array consistently exhibits a stable radiation pattern across both frequency bands.