三路周期微带耦合波导中的冻结模
Frozen Mode in Three-Way Periodic Microstrip Coupled Waveguide
摘要：
我们从理论和实验上证明了周期性三路微带耦合波导具有一个固定的拐点（SIP）。SIP是三阶例外简并点（EPD），其中引导系统的三个本征模合并以形成具有零群速度的静止冻结模。这里的冻结模式是在互易波导中示出的;因此需要三个耦合波导（称为三路波导），在每个方向上支持三个模式。我们说明发生的冻结模式制度通过观察色散图，并通过使用的概念，合并参数，这是一个衡量的分离的三个合并本征向量（偏振态）。基于全波模拟和测量的结果表明，三种模式的合并，以及如何这种合并是不完美的，由于在2 GHz的微带结构中的损耗的存在。聚结参数用于确定三路系统与理想冻结模式条件的接近程度。
英文摘要：
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.
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