科研之友
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摘要
A wide-band circularly polarized reconfigurable antenna based on a pure water dielectric patch antenna is proposed. By changing the shape of pure water in the plexiglass container symmetrically, the circularly polarized states of the antenna can be switched. And the available bandwidth of right-hand circular polarization and left-hand circular polarization remain unchanged. The interface between pure water and air with a great difference in relative dielectric constant is equivalent to an electrical wall. When feed with an L-shaped metallic probe, the axial ratio of a wide band can be formed, and the impedance bandwidth of antenna can be fully utilized. Under the two circularly polarized states of the antenna, the measured results show that the 3-dB axial ratio bandwidth is above 24.4% for |S-11| < -10 dB, the radiation efficiency is concentrated at 58%-71%, and the maximum gain reaches 3.5 dBi.
