论文标题
在三向周期性微带耦合波导中的冷冻模式
Frozen Mode in Three-Way Periodic Microstrip Coupled Waveguide
论文作者
论文摘要
我们在理论上和实验上证明了周期性的三向微带耦合波导表现出固定拐点（SIP）。 SIP是堕落（EPD）的三阶特殊点，其中指导系统的三个本征二聚体结合形成一个固定的冷冻模式，零组速度为零。在这里，冷冻模式显示在相互的波导中；因此，需要三个耦合的波导（称为三向波导），在每个方向上支撑三个模式。我们通过观察分散图和使用合并参数的概念来说明冻结模式制度的发生，这是三个合并特征向量（极化状态）分离的量度。基于全波模拟和测量结果的结果证明了三种模式的合并，以及由于微带结构中2 GHz的损失的存在，这种合并如何不完美。合并参数用于确定三向系统与理想冷冻模式条件的距离。
We demonstrate theoretically and experimentally that a periodic three-way microstrip coupled waveguide exhibits a stationary inflection point (SIP). The SIP is a third order exceptional point of degeneracy (EPD) where three eigenmodes of the guiding system coalesce to form a stationary frozen mode with zero group velocity. Here the frozen mode is shown in a reciprocal waveguide; therefore three coupled waveguides (called three-way waveguide) are required, supporting three modes in each direction. We illustrate the occurrence of the frozen mode regime by observing the dispersion diagram and by using the concept of coalescence parameter that is a measure of the separation of the three coalescing eigenvectors (polarization states). Results based on full-wave simulations and measurements demonstrate the coalescence of three modes and how this coalescence is not perfect due to the presence of losses in the microstrip structure at 2 GHz. The coalescence parameter is used to determine how close the three-way system is to the ideal frozen mode condition.
