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Solutions for EM exposure assessment of 5G wireless devices

2018 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 2075

The paper describes a novel measurement system and 3D field reconstruction method to determine power density in the close near field of wireless devices transmitting from 6–110 GHz. Measurements were compared against simulated results, with reported accuracy …

Study snapshot

Publicationmanual · 2018
Study typeengineering
Reported directionUnclear
Evidence ratingInsufficient

Abstract

Solutions for EM exposure assessment of 5G wireless devices Douglas MG, Pfeifer S, Kuehn S, Neufeld E, Pokovic K, et al. Solutions for EM exposure assessment of 5G wireless devices. IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC), 2018. IEEE, 2018, ISBN 9781509039555: 92-94. doi:10.1109/ISEMC.2018.8394066 Abstract A novel measurement system and a 3D field reconstruction method are described for determining the power density in the close near field of wireless devices transmitting at frequencies from 6-110 GHz. Measurements are compared against simulated results. The accuracy is better than 0.5 dB for distances greater than λ/5 from the radiating source. ieeexplore.ieee.org Excerpts Fifth generation wireless communication systems enable mobile devices to transmit at millimeter wave frequencies. For electromagnetic (EM) exposure assessment, this poses a challenge for wireless device manufacturers and regulatory agencies. At frequencies above 10 GHz, ICNIRP [1] defines limits on power density, which is measured in air at the location of the body. Power density is not correlated with the induced fields in the body. Moreover, it is poorly defined at very close distances of the source to the body because the electric and magnetic fields are not orthogonal and because the body interacts with the reactive near field. In the far field, power density is only a surrogate for induced exposure. On the other hand, power density is easier to measure than induced field, which is concentrated at the skin surface [2]. Therefore, reliable equipment is needed to measure the power density of millimeter wave devices. Another problem is that the prescribed averaging area can be too large compared to the exposed area and is inconsistent between different standards [3]. A novel measurement system and field reconstruction algorithm are presented that enable power density to be measured with an accuracy better than 0.5 dB for distances greater than lambda/5 from the radiating source.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering
Effect directionunclear
PopulationNot supplied
Sample sizeNot supplied
ExposuremmWave
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: unknown

Main findings

The paper describes a novel measurement system and 3D field reconstruction method to determine power density in the close near field of wireless devices transmitting from 6–110 GHz. Measurements were compared against simulated results, with reported accuracy better than 0.5 dB for distances greater than λ/5 from the radiating source.

Outcomes measured

  • Power density measurement in close near field
  • Accuracy of measurement system vs simulations
  • 3D field reconstruction for exposure assessment

Limitations

  • No health or biological outcomes reported
  • Sample size and number/types of devices tested not stated in the provided text
  • Details of simulation setup and measurement protocol not provided in the provided text
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": "mmWave",
    "source": "5G wireless devices",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Power density measurement in close near field",
    "Accuracy of measurement system vs simulations",
    "3D field reconstruction for exposure assessment"
  ],
  "main_findings": "The paper describes a novel measurement system and 3D field reconstruction method to determine power density in the close near field of wireless devices transmitting from 6–110 GHz. Measurements were compared against simulated results, with reported accuracy better than 0.5 dB for distances greater than λ/5 from the radiating source.",
  "effect_direction": "unclear",
  "limitations": [
    "No health or biological outcomes reported",
    "Sample size and number/types of devices tested not stated in the provided text",
    "Details of simulation setup and measurement protocol not provided in the provided text"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "unknown",
  "keywords": [
    "5G",
    "millimeter wave",
    "mmWave",
    "exposure assessment",
    "power density",
    "near field",
    "field reconstruction",
    "measurement system",
    "6-110 GHz",
    "ICNIRP limits"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.62,
      "reason": "Focuses on exposure assessment challenges and measurement solutions for 5G/mmWave devices relevant to regulatory compliance."
    },
    {
      "slug": "who-icnirp",
      "weight": 0.55,
      "reason": "Discusses ICNIRP limits above 10 GHz and power density as the compliance metric."
    }
  ]
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1109/isemc.2018.8394066
PubMed: Not supplied

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