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Methods of the standard EMF generation

Methods of the standard EMF generation

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The previous chapter referred to two calibration methods: the standard transmitting antenna method (STA) or standard field method, and standard receiving antenna method (SRA) or substitution method. Let's characterize them briefly. 1. The STA method is based upon EMF generation with the use of a transmitting antenna whose parameters (radiation pattern, efficiency) are known to a required accuracy and established either theoretically or experimentally. The EMF at an observation point is calculated taking into account the parameters of the antenna, its excitation, and the geometry of propagation. 2. The SRA method requires a receiving antenna of well-known parameters and a system that makes it possible to measure current in the antenna or the voltage at its input. The SRA is placed in an EMF generated by an arbitrary source and then replaced by an antenna (meter, probe, device) under test. Two assumptions are made in this procedure: the EMF is stable enough to not change during the replacement, the antenna under test is immersed in the same field as the SRA and makes identical EMF deformations to the SRA. In the previous discussions we took into account EMF standards with dipole or loop antennas. However, an almost identical approach may be adopted when other types of standards are in use. For instance, in guided wave standards, the EMF is established on the ground of excitation measurement of a system of known parameters, which is similar to the standard field method. In the case of different types of chambers the substitution method is more appropriate.

Chapter Contents:

  • 3.1 Calibration of meters with dipole antennas
  • 3.1.1 Calibration with the standard field method
  • 3.1.2 Calibration with the substitution method
  • 3.1.3 Calibration of meters with whip antennas
  • 3.2 Calibration of meters with loop antennas
  • 3.2.1 Calibration with the standard field method
  • 3.2.2 Calibration with the substitution method
  • 3.2.3 Calibration of meters with whip antennas
  • 3.3 Calibration of meters with directional antennas
  • 3.4 Meter calibration with the use of guided waves
  • 3.4.1 Calibration in the field of a plate capacitor
  • 3.4.2 EMF standards with a traveling wave line
  • 3.4.3 A waveguide as a standard EMF source
  • 3.5 Secondary standards and exposure systems
  • 3.5.1 Chamber methods
  • 3.5.2 Examples of TEM chambers
  • 3.5.3 Other types of secondary standards

Inspec keywords: antenna radiation patterns; transmitting antennas; receiving antennas; electric potential; calibration; geometry; electromagnetic wave propagation

Other keywords: radiation pattern; calibration methods; substitution method; standard field method; standard receiving antenna method; standard EMF generation method; STA; propagation geometry; standard transmitting antenna method; excitation measurement; SRA

Subjects: Measurement standards and calibration; Single antennas; Combinatorial mathematics; Antenna theory; Electromagnetic wave propagation; Electrostatics

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