Compact Broadband Dual-Polarized Antenna Based on Hybrid Radiation Modes and Its Application to Wide-Angle Scanning Array

The work presents a new wideband ±45° dualpolarized antenna for Internet of things (IoT) applications, which consists of a radiator with hybrid operating modes, two feeding baluns and a reflector. A cross-shaped microstrip radiator printed on a planar substrate acts as a half-wavelength dipole, and is etched with a full-wavelength slot. Four T-shaped microstrip stubs are loaded symmetrically around the main radiator. The main novelty is that a broad bandwidth is achieved by simultaneously exciting the half-wavelength dipole mode and the full-wavelength slot mode. Furthermore, a broadband array is completed by interleaving 6 proposed antenna elements. 3-dB beam scanning angle of over ±45° is achieved in the broad operating bandwidth. The experimental results demonstrate that the proposed antenna features a broad operating bandwidth from 1.40 to 2.77 GHz (65.7%).