Non-Contact PIM Evaluation Method using a Standing-Wave Coaxial-Tube

A non-contact PIM measurement method is introduced into the standing wave transmission line method. DUT is tested inside the inner conductor of an opened-coaxial line which is excited in standing wave field. The electromagnetic excitation of DUT realizes non-contact measurement and eliminates electrical contacts such as soldering connection. Employment of wire with the resonant length enables low-power testing. It is also shown that PIM has a relation with its source size and position, and is less produced in small sample compared with operating wavelength.