Large Negative Group Delay in Microstrip Circuit Using Defected U-shaped structure

This paper proposes a large negative group delay microstrip circuit using double defected U-shaped structure. The circuit has been analyzed using simulations to study the influence of different physical parameters on operating frequency, peak negative group delay and S parameters. An equivalent circuit of this design is also proposed. The final model works at 5.8GHz, and it can be widely used for the medical band of WLAN (5.725-5.875GHz) and 5.8G channel of Chinese 5G band due to the special resonance frequency.