A Fast Waveguide Port Parameter Extraction Technique for the DGTD Method Zhao, Lei ; Chen, Geng ; Yu, Wenhua ; Jin, Jian-Ming Abstract Publication: IEEE Antennas and Wireless Propagation Letters Pub Date: 2017 DOI: 10.1109/LAWP.2017.2740298 Bibcode: 2017IAWPL..16.2659Z