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Effect of load impedance on passive intermodulation measurements

Effect of load impedance on passive intermodulation measurements

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A simple model is derived for predicting the distortion level change of a passive intermodulation source as a function of the impedance loading at the transmitting and intermodulation frequencies. The calculated results correspond well with the measurements, having a mean difference of 0.9 dB.

Inspec keywords: intermodulation distortion

Other keywords: intermodulation frequencies; 0.9 dB; passive intermodulation measurements; distortion level; load impedance effect

Subjects: Electromagnetic compatibility and interference; Modulation and coding methods

References

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      • B. Deats , R. Hartmann . Measuring the passive-IM performance of RF cable assemblies. Microw. RF Eng. , 108 - 114
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      • Helme, B.G.M.: `Interference in telecomm systems, from passive intermodulation product generation: an overview', Proc. 22nd Antenna Measurement Techniques Association Annual Symp. (AMTA 2000), October 2000, Philadelphia, PA, USA, p. 143–149.
    3. 3)
      • P.L. Lui . Passive intermodulation interference in communication systems. Electron. Commun. Eng. J. , 109 - 118
    4. 4)
    5. 5)
      • Dumoulin, J.-G.: `Passive intermodulation and its effect on space programs', IEE Colloquium on Screening Effectiveness Measurements (Ref. No. 1998/452), 6 May 1998, London, p. 2/1–2/10.
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