A ±45 Degree Polarization Reconfigurable Antenna Based on Dielectric Liquid

This paper presents $\mathrm{a}\pm 45$ degree polarization reconfigurable antenna based on liquid medium. The antenna consists of a central dielectric resonator antenna (DRA) and three liquid DRAs (The liquid medium is ethyl acetate with low dielectric loss and low toxicity). The DRA on the y-axis keeps the liquid filled, and the other two parasitic DRAs on the x-axis work through the flow of liquid medium to realize the unidirectional radiation. The polarization of the antenna changes with the selection of different parasitic DRAs, which is generated by the flow of liquid medium. Based on this principle, two polarization modes (the polarization is ± 45 degree to the positive direction of Y axis) perpendicular to each other can be obtained, which realizes the reconfiguration of polarization states. In order to verify the design of the antenna, an antenna operating at 2.4GHz band is simulated. The simulation results indicate that the antenna achieves effective impedance matching and sufficient antenna gain in the target operating frequency band, and also verifies its capability of polarization reconfiguration.