Antenna measurements

Antenna measurements

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Although the practical use of antennas is mainly in an outdoor environment where there are large separations between Tx and Rx antennas, modern antenna test ranges attempt to make measurements in indoor facilities where TX and Rx antenna are in close physical proximity to each other. Such indoor facilities have the advantages of security, control of the environment and ease of access for equipment and personnel. However, in order to make measurements in indoor facilities that mirror what would be expected on large outdoor ranges, a number of engineering solutions are required. These solutions involve isolating the test range from its immediate environment, which usually involves placing the range in a metallic chamber of some other enclosure to ensure the signals generated inside the chamber stay in the chamber and signals generated outside the chamber do not interfere with the measured signals generated inside the chamber.

Chapter Contents:

  • 3.1 Antenna measurements and alignment
  • 3.2 Rotation methodologies
  • 3.3 Far-field ranges
  • 3.4 Free-space conditions
  • 3.5 Alternatives to far-field ranges
  • 3.5.1 The compact antenna test range
  • 3.6 Indirect measurements
  • 3.6.1 Spherical near-field ranges
  • 3.6.2 Planar near-field measurements
  • 3.6.3 Cylindrical near-field measurements
  • 3.7 Other geometries for scanning measurements
  • 3.8 Attributes common to all near-field measurement techniques
  • 3.8.1 The scanning probe
  • 3.8.2 Generic near-field antenna measurement process
  • 3.9 Summary
  • References

Inspec keywords: antenna testing; antenna radiation patterns; receiving antennas; transmitting antennas

Other keywords: metallic chamber; antenna measurements; antenna test ranges

Subjects: Production facilities and engineering; Single antennas

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