Wideband Flat Negative Group Delay Circuit Based on Dielectric Resonator

This paper presents a negative group delay circuit (NGDC) based on microstrip line and dielectric resonator (DR), analyses an equivalent circuit of this structure, and simulates the operating frequency, negative group delay and S-parameters by combining different cases of dielectric resonators, such as cylinder and cuboid, and discusses the method of broadening the frequency band. The proposed structure at a center frequency of 4.9GHz achieves a relative NGD bandwidth of 2.7% and brings about a negative group delay value of -0.5ns. It can be used in the 4.9 GHz band for 5G signals, and the operating frequency can be easily changed by adjusting the resonator size and position.