Circulators, as passive non-reciprocal devices, have excellent potential for application in wireless communication and radar-signal processing. However, the construction of terahertz (THz)-frequency circulators is extremely difficult. Here, an electromagnetic matching model for metamaterials is proposed to support the design of a THz circulator with a wider operating bandwidth. The resulting circulator can work without an external magnetic field in the THz frequency range. The best isolation of this THz circulator is 20.9 dB, and its maximum directionality is 16.6 dB. These results validate a new method for the design of metamaterial-based THz devices.

循环器作为无源不可逆设备，在无线通信和雷达信号处理中具有广阔的应用潜力。但是，太赫兹（THz）频率循环器的构造极为困难。在这里，提出了一种用于超材料的电磁匹配模型，以支持具有更宽工作带宽的太赫兹环行器的设计。最终的循环器可以在THz频率范围内没有外部磁场的情况下工作。该THz循环器的最佳隔离度为20.9 dB，其最大方向性为16.6 dB。这些结果验证了一种用于设计基于超材料的太赫兹器件的新方法。