A Wideband Magnetic-Free Circulator Using Spatio-Temporal Modulation of 2-pole Bandpass Filters. - Mahmoud Nafe; Xiaohu Wu; Xiaoguang Liu 002 (RWS, 2019)

Frequency Tunable Non-Reciprocal Bandpass Filter Using Time-Modulated Microstrip λg/2 Resonators. - Xiaohu Wu; Mahmoud Nafe; Alejandro Álvarez-Melcón; Juan Sebastian Gomez-Diaz; Xiaoguang Liu 002 (IEEE Trans. Circuits Syst. II Express Briefs, 2021)