By incorporating the complex envelope (CE) method and the higher order concept, unconditionally stable perfectly matched layer (PML) is proposed based on the Crank–Nicolson approximate-factorization-splitting (CNAFS) algorithm to simulate the bandpass problems in finite-difference time-domain lattice. The proposed algorithm has the advantages of the CNAFS algorithm, higher order PML concept, and CE method in terms of improving efficiency, enhancing absorbing performance, and simulating bandpass problems. A patched antenna model is carried to investigate effectiveness and efficiency.

中文翻译：

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具有改进吸收的复包络近似 CN-PML 算法

通过结合复包络（CE）方法和高阶概念，基于Crank-Nicolson近似分解分裂（CNAFS）算法提出无条件稳定完美匹配层（PML）来模拟有限差分时间内的带通问题-域晶格。该算法在提高效率、增强吸收性能、模拟带通问题等方面具有CNAFS算法、高阶PML概念和CE方法的优点。进行贴片天线模型以研究有效性和效率。