A Matched Negative Group Delay Circuit and its Integration With an Unequal Power Divider

In this paper, a resonator coupling negative group delay (NGD) circuit with resistor-loaded coupled lines is presented firstly, and then an unequal Wilkinson power divider with NGD characteristic is designed by integrating the proposed NGD circuit into an unequal power divider. Both the NGD circuit and the unequal power divider with NGD characteristic have been fabricated and measured, and both of the designs have been demonstrated. The proposed NGD circuit has a measured signal attenuation (S21) of 13.5 dB, a S11 attenuation of 31.7 dB, and a negative group delay time of -2.56 ns, while the proposed integration circuit has a measured S11/S33 attenuation of more than 37 dB, a S22 attenuation of more than 22 dB, an isolation of more than 35 dB, and a negative group delay time of -4.21 ns.