Low-profile polarization reconfigurable metasurface antenna

This paper proposes a low-profile polarization reconfigurable metasurface antenna. The antenna consists of three parts: a metasurface superstrate which is composed of a 3×4 array of metallic rectangular patches, a slot-coupled antenna, and a simple DC bias controlling circuit. The DC bias control circuit includes four pair switches consisting of eight PIN diode switches (PIN1, PIN2, PIN3 and PIN4) and DC bias lines. By controlling the working states of the PIN switches in different positions, the antenna can produce linear polarized (LP) wave, left-handed circular polarized (LHCP) wave, and right-handed circular polarized (RHCP) wave. The measured results of shared operating bands in different operating states show that the −10 dB impedance bandwidth is 29.8% from 4 to 5.4 GHz, and 3 dB AR bandwidth is 8.3% from 4.6 to 5 GHz. The measured gain in each condition varies little, and the average gain is greater than 5 dBi. The simulated and measured results are in good agreement.