E-Field Strength Measurements of a 5G Base Station in 28 GHz Band for EMF Exposure Assessment

PAPER manual 2021 Exposure assessment Effect: no_effect Evidence: Low

Read original paper → DOI: 10.23919/usnc Evidence Lab

Abstract

E-Field Strength Measurements of a 5G Base Station in 28 GHz Band for EMF Exposure Assessment Sen Liu, Teruo Onishi, Masao Taki, Miwa Ikuyo, Kazuhiro Tobita, Soichi Watanabe, Yukihisa Suzuki. E-Field Strength Measurements of a 5G Base Station in 28 GHz Band for EMF Exposure Assessment. 2021 IEEE USNC- URSI Radio Science Meeting (Joint with AP-S Symposium), 2021, pp. 49-50, doi: 10.23919/USNC- URSI51813.2021.9703567. Abstract This paper presents the preliminary measurement results of the electric field (E-field) strength resulting from a fifth-generation (5G) base station operating in 28 GHz band. Three different measurement cases are discussed. The time-averaged (1 min) total E-field strength in all cases is no more than 91 dBμV/m. Conclusion This paper presents the measurement results of the E-field strength from a 5G base station operating in 28 GHz band. Three different situations are considered, and the total E-field strength is much lower than the limit value of 155.76 dBμV/m (61.4 V/m) in the corresponding band [4] for all cases. It is also found that although the instantaneous E-field strength during data traffic reaches 97.74 dBμV/m, the RMS E-field strength during data traffic is only 0.4 dB higher than that without data traffic-on in this measurement. Although horn antennas have the advantage of discriminating downlink and uplink in TDD, an omnidirectional antenna will be used, and the corresponding results will be compared with those in this work in the future. In addition, comprehensive measurements and verifications will also be conducted. ieeexplore.ieee.org My note: 97.74 dBμV/m = 0.077 V/m

AI evidence extraction

At a glance

Study type

Exposure assessment

Effect direction

no_effect

Population

—

Sample size

—

Exposure

mmWave 5G base station · 28000 MHz · time-averaged (1 min)

Evidence strength

Low

Confidence: 78% · Peer-reviewed: unknown

Main findings

Preliminary measurements of a 5G base station operating in the 28 GHz band across three cases found the time-averaged (1 min) total E-field strength was no more than 91 dBμV/m. The authors report the measured total E-field strength was much lower than the cited limit value of 155.76 dBμV/m (61.4 V/m) for all cases; instantaneous E-field during data traffic reached 97.74 dBμV/m, while RMS E-field during data traffic was only 0.4 dB higher than without data traffic-on.

Outcomes measured

Electric field (E-field) strength (total, time-averaged 1 min)
Instantaneous E-field strength during data traffic
RMS E-field strength during data traffic
Comparison to limit value (155.76 dBμV/m; 61.4 V/m)

Limitations

Described as preliminary measurement results
Only three measurement cases/situations are discussed (details not provided in abstract)
Future work planned using an omnidirectional antenna and comprehensive measurements/verification

Suggested hubs

5g-policy (0.62)
Measures E-field exposure from a 5G base station in the 28 GHz (mmWave) band and compares to an exposure limit value.

View raw extracted JSON

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "mmWave",
        "source": "5G base station",
        "frequency_mhz": 28000,
        "sar_wkg": null,
        "duration": "time-averaged (1 min)"
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Electric field (E-field) strength (total, time-averaged 1 min)",
        "Instantaneous E-field strength during data traffic",
        "RMS E-field strength during data traffic",
        "Comparison to limit value (155.76 dBμV/m; 61.4 V/m)"
    ],
    "main_findings": "Preliminary measurements of a 5G base station operating in the 28 GHz band across three cases found the time-averaged (1 min) total E-field strength was no more than 91 dBμV/m. The authors report the measured total E-field strength was much lower than the cited limit value of 155.76 dBμV/m (61.4 V/m) for all cases; instantaneous E-field during data traffic reached 97.74 dBμV/m, while RMS E-field during data traffic was only 0.4 dB higher than without data traffic-on.",
    "effect_direction": "no_effect",
    "limitations": [
        "Described as preliminary measurement results",
        "Only three measurement cases/situations are discussed (details not provided in abstract)",
        "Future work planned using an omnidirectional antenna and comprehensive measurements/verification"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "unknown",
    "keywords": [
        "5G",
        "base station",
        "28 GHz",
        "mmWave",
        "E-field strength",
        "exposure assessment",
        "time-averaged",
        "RMS",
        "TDD",
        "horn antenna"
    ],
    "suggested_hubs": [
        {
            "slug": "5g-policy",
            "weight": 0.61999999999999999555910790149937383830547332763671875,
            "reason": "Measures E-field exposure from a 5G base station in the 28 GHz (mmWave) band and compares to an exposure limit value."
        }
    ]
}

AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

Comments

No comments yet.