论文标题
具有实时独立幅度和相控制的元表面反射器
Metasurface Reflector with Real-Time Independent Magnitude and Phase Control
论文作者
论文摘要
提出了一种新型的元表晶胞结构，以在所需的操作频率下独立控制反射幅度和相位，同时保持传入磁场的线性极化。所提出的结构基于耦合谐振器构型，其中偶极子环谐振器（DRR）装有可调式的电阻元件（例如销钉二极管）和拆分环谐振器（SRR），该谐振器（SRR）带有隆起的可调电容器（例如变量二极管），已插入。该表面接下来是在耦合的谐振频率之一周围运行的，在该耦合频率之一中，对集体电容和电阻元件进行独立的调整可以实现反射振幅相位的广泛覆盖范围，这比使用单个共振器配置可以实现的要大得多。进一步开发了一个有见地的等效电路模型，用于研究均匀表面的振幅相位特性作为可变电阻和电容的函数，接下来是使用全波模拟的。最后，使用各种全波动示例，证明了同时和独立的振幅相控制的有用性，包括带有光束倾斜和多光束模式实现的可变模式增益的案例，否则，仅使用振幅或相位控制就无法使用这种情况。
A novel metasurface unit cell architecture is proposed to enable independent control of the reflection magnitude and phase at a desired operation frequency, while maintaining linear polarization of the incoming fields. The proposed structure is based on a coupled-resonator configuration where a Dipole Ring Resonator (DRR) is loaded with a tunable lumped resistive element (e.g. PIN diode) and Split Ring Resonator (SRR) loaded with a lumped tunable capacitor (e.g. varactor diode), are interleaved. The surface is next operated around one of the coupled resonant frequency, where an independent tuning of the lumped capacitance and resistance elements enable a wide coverage of reflection amplitude-phase, which is significantly larger than what would have been achievable using a single resonator configuration. An insightful equivalent circuit model is further developed for investigating the amplitude-phase characteristics of a uniform surface as a function of variable resistance and capacitance, which is next confirmed using full-wave simulations. Finally, using a variety of full-wave examples, the usefulness of simultaneous and independent amplitude-phase control is demonstrated, including cases of variable pattern gain with beam tilting and multi-beam pattern realization, which otherwise would not be possible using either amplitude or phase control only.
