A transmissive metasurface polarization beam splitter (MPBS) with three-layer dielectric substrate was designed to meet the application requirements of polarization beam splitting devices. The microstructure unit cell was composed of an elliptical patch and a square resonant ring, and the phase and amplitude responses to the x- and y-polarized incident waves were independent. Here 16 transmissive unit cells designed with a 90° phase difference and more than 0.8 transmission coefficient could be used to realize different functions by pre-designing distribution of “00”, “01”, “10”, “11” encoding particles in x- and y-direction. We experimentally demonstrated a 2-bit encoding MPBS that separated x- and y-polarization incident waves into two different directions at 15 GHz respectively using specially designed encoding unit cells. The work may alleviate the shortage of advanced multifunctional devices and provide important application prospect in imaging, MIMO system, etc.

为了满足偏振分束器件的应用需求，设计了一种具有三层介质基板的透射超表面偏振分束器（MPBS）。微结构晶胞由椭圆贴片和方形谐振环组成，对x和y偏振入射波的相位和幅度响应是独立的。这里通过预先设计x中“00”、“01”、“10”、“11”编码粒子的分布，可以使用 16 个具有 90° 相位差和超过 0.8 透射系数的透射单元格来实现不同的功能- 和y方向。我们通过实验演示了一个 2 位编码 MPBS，它将x - 和使用专门设计的编码单元将y偏振入射波分别在 15 GHz 时分为两个不同方向。该工作可能会缓解先进多功能设备的短缺，并在成像、MIMO系统等方面提供重要的应用前景。