论文标题
离散的huygens的跨表面：实现异常反射和衍射模式循环，具有坚固，宽带和简单的设计
Discrete Huygens' Metasurface: Realizing Anomalous Reflection and Diffraction Mode Circulation with a Robust, Broadband and Simple Design
论文作者
论文摘要
由亚波长度单位细胞组成的元图通常需要大量的单位细胞，从而导致复杂的设计和优化。跨表面的积极离散可以显着减少一段时间内的单位细胞数量，从而降低对相位和/或表面阻抗覆盖范围的要求。此外，放大的单元电池将混合在一起时会遇到可忽略不计的相互耦合，从而使跨表面设计的过程直接。这些优势结合在一起，允许设计一类新型的跨度，这些元整形面积支持电磁（EM）波的高效率重定向，并在宽带的带宽和操作角度上。此外，积极离散的跨表面可能会实现诸如衍射模式循环等功能，而衍射模式循环在其连续的对应物中不受支持。在本文中，我们提出了一个简单的透射式元表，可以通过以-45、0、45度折射平面波，分别以0、45、45度的折射角度折射平面波，以实现衍射模式循环。在28 GHz的设计频率下，每种异常折射的功率效率超过80％，而3-DB功率效率带宽为11％。我们制造并测量了元表面，实验结果与模拟结果非常吻合。
Metasurfaces composed of subwavelength unit cells usually require a large number of unit cells which leads to complicated design and optimization. Aggressive discretization in a metasurface can significantly reduce the number of unit cells within a period, resulting in lower requirement for phase and/or surface impedance coverage. Additionally, the enlarged unit cells will encounter negligible mutual couplings when combined together, hence making straightforward the process of metasurface design. These advantages combine to allow the design of a novel class of metasurfaces which support the high efficiency redirection of electromagnetic (EM) waves over a wide bandwidth and operation angle. Moreover, an aggressively discretized metasurface may realize functionalities such as diffraction mode circulation, which are unsupported in its continuous counterparts. In this paper we propose a simple transmissive metasurface which can realize diffraction mode circulation by refracting plane waves with incident angles of -45, 0, 45 degrees to plane waves with refraction angles of 0, 45, -45 degrees respectively. The power efficiency of each anomalous refraction is more than 80% at the design frequency of 28 GHz, and the 3-dB power efficiency bandwidth is 11%. We fabricated and measured the metasurface, the experiment results agree well with simulation results.
