A filter with equal-ripple negative group delay. - Liang-Feng Qiu; Lin-Sheng Wu; Wen-Yan Yin; Jun-Fa Mao (RWS, 2018)

A Flat-Passband Predistorted Bandpass Filter With Folded Substrate Integrated Waveguide. - Liang-Feng Qiu; Bing Xie; Lin-Sheng Wu; Junfa Mao (IEEE Trans. Circuits Syst. II Express Briefs, 2022)

A Compact Ka-Band Hybrid Analog/Digital Phase Shifter With GaAs Technology. - Yi-Feng Ye; Yi-Tong Wang; Jia-Hao Feng; Lin-Sheng Wu; Liang-Feng Qiu; Junfa Mao (IEEE Trans. Circuits Syst. II Express Briefs, 2024)