In this study,we proposed a low-loss microwave negative group delay circuit with a waveshape.The proposed circuit is composed mainly of four identical microstrip transmission lines,two identical coupled microstrip lines,and a T-shaped connector.After describing the equivalent circuit topology,the S-parameter model and the negative group delay formula of the circuit were derived using microwave circuit theory.The circuit structure was optimized using ADS simulation,and the fabrication and measurement were carried out.Test results showed that at a center frequency of 1.017 GHz,the maximum group delay of the circuit was -2.46 ns,the insertion loss was -2.1 dB,and the reflection loss was -13 dB.The measured results were in good agreement with results from both simulations and theoretical calculations.