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Antenna measurement improvement using spherical or cylindrical mode expansion

Antenna measurement improvement using spherical or cylindrical mode expansion

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In this chapter, we will focus separately on the spherical and cylindrical modal expansion techniques. The spatial filtering based on the SWE technique is described in Section. The SWE can be applied to any type of antenna and it requires the knowledge of the full three-dimensional (3D) radiation pattern. In Section, we will see how the SWE can be exploited not only for echo reduction purposes but also for noise reduction and to mitigate the errors coming from the truncation of the scanning area.

Chapter Contents:

  • 5.1 Improvements of antenna measurement accuracy using spherical mode expansion
  • 5.1.1 Spherical wave expansion theory
  • 5.1.1.1 AUT minimum sphere and minimum cylinder
  • 5.1.1.2 Sampling criteria
  • 5.1.1.3 Computation of the SWC
  • 5.1.1.4 Understanding the SWC
  • 5.1.2 SWE as spatial filter
  • 5.1.2.1 Spatial filtering based on SWE: workflow
  • 5.1.2.2 Noise reduction in SNF measurements using the SWE
  • 5.1.2.3 Echo reduction with SWE
  • 5.1.2.4 Reduction of truncation errors in SNF measurements
  • 5.2 Exploiting cylindrical mode expansion for fast singlecut measurements with improved accuracy
  • 5.2.1 Theory of cylindrical waves
  • 5.2.2 Single-cut measurements
  • 5.2.3 Applications to echo reduction in single-cut measurements
  • 5.3 Conclusions
  • References

Inspec keywords: near-field communication; filtering theory; echo suppression; antenna radiation patterns

Other keywords: scanning area; cylindrical mode expansion; full three-dimensional radiation pattern; echo reduction; spatial filtering; SWE technique; antenna measurement improvement; noise reduction; 3D radiation pattern

Subjects: Single antennas; Other radio links; Filtering methods in signal processing; Electromagnetic compatibility and interference

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