With more and more frequency bands and more and more people use mobile communication, the burden of the whole communication network becomes heavier and heavier, and the spectrum resources become increasingly scarce. At this time, the co-channel interference, third-order intermodulation (PIM3) and other issues become increasingly prominent. PIM3 refers to the interference caused by the third harmonic of the adjacent channel still falling into the communication band. Cable assemblies, connectors, and other components used in current communication require low PIM3. The low-PIM cable assembly developed by Gwave is designed to be applied in Intermodulation Instrument or in testing microwave passive devices with Intermodulation Instrument .