Polarization- and Mode-Reconfigurable Wideband OAM Magneto-Electric Dipole Antenna Array

This letter reports a wideband linearly polarized (LP) and orbital angular momentum (OAM) mode-reconfigurable magneto-electric (ME) dipole antenna array. A switchable microstrip balanced feed structure (MBFS), which can provide a stable phase difference of 180 degrees in the whole operating frequency band, is employed in the design of the ME dipole element. By using two orthogonal MBFS, two high-isolation LP modes with switchable 180 degrees phase shifting characteristics can be generated, enabling the reconstruction of LP modes through polarization synthesis. By manipulating the states of the reconfigurable feed network and the four ME dipole elements, the polarization can be altered among two orthogonal LP states, and the OAM mode can be reconfigured between l = -1, 0, and +1. The measurement results indicate that the proposed ME dipole array exhibits a good reflection coefficient in the frequency range of 3.0 GHz to 4.0 GHz (|S-11| < -10 dB) and demonstrates excellent reconstruction capability in both polarization and OAM modes.