@article{wignersmithtimedelaymatrixfor2,
  title = {Wigner-Smith Time Delay Matrix for Electromagnetics: Guiding and Periodic Systems with Evanescent Modes},
  author = {Yiqian Mao and Utkarsh R. Patel and Eric Michielssen},
  year = {2022},
  eprint = {2206.02571},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2206.02571v1},
}