A power divider with positive and negative group delay characteristics

In this paper, a power divider is suggested for predefined positive and negative group delay characteristics. The positive group delay (PGD) is obtained in between transmission paths 2 and 1, whereas the negative group delay (NGD) is in between transmission paths 3 and 1. The PGD and NGD are controlled by characteristic impedance of horizontal transmission line Z
₁
and shunt resistor R. Perfect input and output matching characteristics as well as perfect isolation are obtained at a center frequency (f
₀
). For an experimental demonstration, microstrip line power divider with the PGD and NGD of 0.6 and -0.5 ns, respectively, was designed and fabricated at f
₀
of 2.14 GHz. The measurement results are agreed well with simulation results and theoretical predicated values.