A design method of low Passive Intermodulation(PIM) coaxial connectors using noncontact inner conductors is proposed in this paper. Coaxial connectors are widely used in satellite communication systems, and their PIMs seriously affect the communication performance. Two coaxial connectors with noncontact inner conductors in S-band and C-band are designed and implemented, respectively. The measured |S11| of the proposed coaxial connectors is less than -30 dB from 2.1 GHz to 2.7 GHz in S band, and the insertion loss is better than 0.3 dB. The measured |S11| of the C band connector is less than -30 dB from 3.5 GHz to 4.2 GHz, and the insertion loss is better than 0.2 dB. The proposed coaxial connector design method with noncontact inner conductors may lower the PIM of a coaxial connector and has bright future applications in satellite communication systems.