This paper presents a new design of negative resistance oscillator with low phase noise by using microwave microstrip technology. This microstrip oscillator is designed at 2.4 GHz frequency for applications in mobile communication, wireless network, wireless fidelity, and Bluetooth. The final circuit is designed by using microstrip distributed resonator. The distributed resonator can be modeled by using the parallel RLC at the resonant frequency. The high Q factor of the resonator provides high carrier output power and low phase noise. The output power is obtained around 7.902dBm at 2.4 GHz with 2V DC supply and 12 mA current consumption. In this proposed oscillator, each step has been analyzed by using Advanced Design System ADS and following a theoretical study which permits to optimize the different performances of the whole circuit.