In the passive intermodulation (PIM) measurement of microstrip lines using non-contact planar connector, this letter presents a proper sample length for the 3rd-order PIM measurement due to closely frequency-spaced transmission waves. Our experimental study using nickel-plated samples as a distributed PIM source reveals that a spacing between non-contact connectors should be a quarter the guided wavelength in order to suppress the effect of non-contact connectors on the PIM measurement results and maximize the observed reverse PIM. We also demonstrate a circuit-network simulation using the harmonic balance method, which agrees well with and validates the experiments.
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Shirakawa et al. (2024) studied this question.
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