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Non-contact PIM Evaluation Method Using a Standing Wave Coaxial Tube
Daijiro ISHIBASHI Nobuhiro KUGA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E95-C
No.9
pp.1508-1514 Publication Date: 2012/09/01 Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1508 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices - Papers selected from International Session on Electro-Mechanical Devices 2011 (IS-EMD2011) and other recent research results -) Category: Keyword: passive intermodulation, standing wave measurement, nonlinearity, non-contact measurement, electric contacts,
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Summary:
In this paper, a contactless measurement technique of passive intermodulation (PIM) using a coaxial tube excited with standing waves is proposed. The principle of the proposed method is described using a two-port network model with the lumped resistances representing the losses of a specimen and test equipment. To show its validity, a test using nickel wires producing high PIM is carried out, and its PIM-dependency on DUT-position in the coaxial tube is simulated using the FDTD method. The simulated result shows a good agreement to the experiment. Through the examination, it is found that the power consumption by the PIM source in a specimen is essential in PIM production, and sensitive PIM detection does not require good matching condition. Finally, the relation between PIM-source size and generated PIM level is also examined. The result shows that at least 18 dB-PIM reduction is obtained by PIM source size in a half-wavelength conductive wire.
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