Group delay compensation technique for UWB MMIC using composite right/left-handed circuit

A group delay equalizer consisting of a composite right/left handed (CRLH) circuit in parallel with a right handed (RH) circuit is proposed for UWB RF components. Dispersion characteristics and group delay characteristics for the proposed circuit are described. A group delay compensation circuit was designed for the developed InGaP/GaAs HBT MMIC amplifier with an active balun. It is demonstrated that the measured standard deviations of group delay can be reduced from 16.5 psec in S21 and 12.4 psec in S31 to 4.4 psec in S21 and 7.7 psec in S31, respectively, in a circuit simulation.