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Passive intermodulation PIM in printed lines:
effects of trace dimensions and substrate
A comprehensive experimental study was performed to identify and discriminate mechanisms
contributing to passive intermodulation (PIM) in microstrip transmission lines. The effects of strip length and
width, and substrate materials on PIM performance of printed lines were investigated in the GSM900,
DCS1800 and UMTS frequency bands. The major features of the experiment design, sample preparation and
test setup are discussed in detail. The measurement results have demonstrated that the PIM level
cumulatively grows on the longer microstrip lines and decreases on wider strips and, thus, indicated that the
distributed resistive nonlinearity of the printed traces represents the dominant mechanism of intermodulation
generation in the printed lines on PTFE-based substrates.
关键字: microstrip lines, passive intermodulation (PIM), forward PIM, reverse PIM
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