Measurement of intermodulation products generated by structural components

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Measurement of intermodulation products generated by structural components

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© The Institution of Electrical Engineers
Published

A computer-controlled measurement system is described, developed to investigate intermodulation products generated by nonlinear junctions in antenna towers, mast support and mounting components. Results are presented which suggest that certain mechanical features, commonly encountered in some components, should be regarded as more likely to be associated with this cause of interference.

Inspec keywords: electromagnetic compatibility; computerised instrumentation; intermodulation measurement

Other keywords: mounting components; EMC; nonlinear junctions; mechanical features; structural components; RFI; antenna towers; mast support; intermodulation products measurement; computer-controlled measurement system

Subjects: Control of electronic instruments; Other electric variables measurement; Communications computing; Electromagnetic compatibility and interference

References

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      • Martin, R.H.: `intermodulation product generation studies on materials, connectors and structures', Proc. IERE Int. Conf. Electromagnetic Compatibility, 1978, 243–250.
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      • R.F. Elsner , L.S. Smulkstys . Linear dummy loads. IEEE Trans. , 320 - 324
    3. 3)
      • Shand, T.C., Woody, J.A.: `Metal-insulator-metal junctions as surface sources of intermodulation', Report no. RADC-TR-83-31, 1983, 12–14.
    4. 4)
      • Frazier, M.J., Morissette, S.: `Study concerning non-linearmixing of RF signals in steel structures', Report no. 6047–7, 1965.
    5. 5)
      • Bevan, H.L., Frampton, L.G., Ho, P., Tseung, A.C.C., Wilkinson, W.S.: `Suppression of intermodulation product generation inmaterials and structures used in radio communications', IERE Int.Conf. Electromagnetic Compatibility, 1986, 103–110.
    6. 6)
      • Betts, J.A., Ebenezer, D.R.: `Generation of intermodulation interference due to non-linear effects in the near-field regions ofmultiple-transmission communication system', Proc. AGARD Conf. on Aerospace Telecommunication Systems, 1972, 25/1–25/12.
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