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Passive Intermodulation in Finite Lengths of Printed Microstrip Lines

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4 Author(s)
Dmitry E. Zelenchuk ; Inst. for Electron., Commun. & Inf. Technol. (ECIT), Queen's Univ. of Belfast, Belfast ; Aleksey P. Shitvov ; Alexander G. Schuchinsky ; Vincent F. Fusco

This paper addresses the theoretical aspects of passive intermodulation (PIM) generation in printed transmission lines. In order to elucidate the mechanisms of PIM generation, a new model of the transmission line length with distributed nonlinearity is proposed. The developed model has been validated by the near-field measurements of PIM product distributions along the microstrip lines. The contributions of nonlinear mixing, power dissipation, and load matching to PIM products have been analyzed in detail. The obtained results reveal the fundamental properties of PIM generation in finite lengths of printed lines with distributed nonlinearity and identify possible means for PIM mitigation. It was shown for the first time that the reverse PIM products in a matched transmission line with distributed nonlinearity are generated due to nonlinear scattering.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:56 ,  Issue: 11 )