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MIC MRA International Workshop 2019, March 7, 2019
5Gの人体暴露測定Myles Capstick, IT’IS Foundation
Serge Pfeifer, IT’IS Foundation
Sven Kühn, IT’IS Foundation
Jingtian Xi, IT’IS Foundation
Leif Klysner, SPEAG
Romain Meyer, SPEAG
Katja Pokovic, SPEAG
Niels Kuster, IT’IS Foundation & ETH Zurich
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内容
5G Sub6: 600 MHz – 6 GHz
5G mm波: 6 – 110 GHz- 安全ガイドライン: オープンイシュー- mmWave評価方法- Accurate E-Field Measurements <10 to >100 GHz
- プローブ較正 10 – 110 GHz
- スキャニングとフィールド再構成- 認証ソース- Uncertainty Budget
- システム認証
R&Dにおけるソリューション- Forward Transformation Evaluation
- 最大暴露評価- SAR とPower Densityの合成- 適合性評価- 送信電力の評価
結論
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EM Safety Guidelines / Regulations
0GHz
IT’IS
SATIMO
ART-FI
10MHz 0.10 kHz
3GHz 6
6GHz 3GHz 6
power density
GHz 10GHz
GHz 10GHz11
100kHz 300GHz
5G sub6 5G mmWave
ICNIRP SAR
FCC
IEEE
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日本語訳不要
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5G sub6: 600 MHz – 6 GHz
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SAR 黄金規格: DASY6
IIEC 62209
FCC KDB 865664 …
IEEE 1528
ANSI-C63.19
IEC 62232
EN 50385
EN 50383:2010
EU Directive RED 2014/53/EU
AS/NZS 2772-2:2011
ARIB STD T-56 3.1
IS16133
DT-IFT-007-2015
IEEE/IEC 1528-62209
etc.
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全身ファントム
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最新の作成: IEC 1528-62209 5Gsub6向け
拡大周波数: 4 MHz – 10 GHz
MIMOを可能に- 相関および非相関信号用SAR combiner
- 特定ファントム- 腕- ゴーグル
no missing gaps for sub6
cDASY V6.10 ready for all sub6release 3Q19
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5G mm波: 6 (10) – 110 GHz
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安全性ガイドライン: オープンイシュー
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規制: 改正中のガイドライン/ 開発された機器
incident 出力密度reactive near-fieldでの定義が不十分Re(S)
送信電力instrumentation ready by now
温度との関連averaging area
averaging time
combination w/ SAR
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規格のための詳細な分析&ソリューションの提案が含まれる最近の出版物
Pfeiffer S et al., Total Field Reconstruction in the Near-Field Using Pseudo-Vector E-Field Measurements: IEEE Transactions on
Electromagnetic Compatibility, 61 (2) , 2018
Carrasco E et al, Exposure Assessment of Portable Wireless Devices Above 6 GHz, Radiation Protection Dosimetry, ncy177, 2018
Neufeld E et al., Theoretical and Numerical Assessment of Maximally Allowable Power-Density Averaging Area for Conservative 5G
Exposure Assessment: Bioelectromagnetics, 39 (8), 2018
Neufeld E, et al., Systematic Derivation of Safety Limits for Time-Varying 5G Radio Frequency Exposure Based on Analytical Models and
Thermal Dose. Health Phys 115:705-711; 2018.- Foster KR Comments on Neufeld and Kuster. "Systematic Derivation of Safety Limits for Time-Varying 5G Radiofrequency Exposure Based on Analytical Models and
Thermal Dose." Health Phys. 115.6 (2018): 705-711 (submitted)
- Neufeld et al, Response to Prof. Foster's Comments on Our Paper "Systematic Derivation of Safety Limits for Time-Varying 5G Radiofrequency Exposure Based on
Analytical Models and Thermal Dose." Health Phys. 115.6 (2018): 705-711 (submitted)
Foster KR, et al. Thermal Analysis of Averaging Times in Radio-Frequency Exposure Limits Above 1GHz. IEEE Access 6:74536-74546;
2018
Samaras T et al, Theoretical Evaluation of the Power Transmitted to the Body as a Function of Angle of Incidence and Polarization at
Frequencies >6 GHz and its Relevance for Standardization. Bioelectromagnetics, 2019 (published online)
Christ A, et al., RF-Induced Temperature Increase in Layered Skin Tissue for Frequencies from 6 to 100 GHz: Bioelectromagnetics, 2019
(revision submitted)
Neufeld E, et al. Discussion on Consistent Spatial and Time Averaging Restrictions within the Electromagnetic Exposure Safety
Framework in the Frequency Range Above 6GHz for Pulsed and Localized Exposures. Bioelectromagnetics 2019 (revision submitted)
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Incident Power Density (PD) versus SAR および送信電力(Str)
出力密度は意味がなく、非常に反応性の高い近接場では決定できない
特に10 GHz未満
代わりに SAR または Strを使用すべき!
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mmWave評価方法
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Near-Fieldにおける直接測定
E-field probes課題field distortions by substrates / probe body
directionality
H-field probes課題field distortion / scattering by probe body
E-field sensitivity
elctro-/magneto-optical probes課題spatial resolutions
sensitivity
wave-guide課題large field distortions
fixed impedance
近距離評価法
Far-Fieldでの測定による
measurement with horn antennas in the far
field + backward transformation to the near-
field課題
error < a few dBs
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Backward Transformation (Towards the Source)
information about reactive fields and
evanescence fields are missing
backward propagation falls apart very close
to the source- example from 2mm to 0.1 mm
unreliable with uncertainties >10 dB
適合性試験には使用できない
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By Direct Measurement in the Near-Field
E.field probeschallenges
‣ field distortions by substrates / probe body
‣ directionality
H-field probeschallenges
field distortion/scattering by probe body
E-field sensitivity
elctro-/magneto-optical probeschallenges
spatial resolutions
sensitivity
wave-guidechallenges
large field distortions
fixed impedance
近距離評価法
Via Measurement in the Far-Field
measurement with horn antennas in the far
field + backward transformation to the near-
fieldchallenges
‣ error < a few dBs
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Accurate E-Field Measurements <10 to >100 GHz
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EUmmWV2 Probe: Pseudo-Vector Design
プローブ- 2 dipoles (one each side of the quartz substrate)
- ≈0.9 mm long and diode loaded
- typical distance between physical tip and sensor
center: 1.5 mm
石英基盤- 幅0.9 mm
- 長さ20 mm
- 厚さ0.18 mm
- dipole sensors present
- 𝜀r = 3.8 (quartz) homogeneous
測定: three rotations around axis, (i.e., six
E-field measurements in total)
reconstruction of ellipse and elimination of
mechanical tolerances
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EUmmWV2 プローブ: 反射の最小化
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EUmmWV2 プローブ性能
周波数レンジ: 750 MHz – 110 GHz
ダイナミックレンジ: <20 – 10,000 V/m
with PRE-10 (minimum <50 – 3000
V/m)
hemispherical isotropyからの逸脱:
<0.5 dB at 60 GHz
linearity: <0.2 dB
compatibility: 5G-Module 1.0+ (DASY6) V1,
mmW-Module 1.0+ (ICE V2.0+)
ISO17025較正済み
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EUmmW プローブ: DASY6 およびICEyへのシステム統合
Benefits
1st method to assess power density in the near-
field of sources
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プローブの較正 10 – 110 GHz
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較正方法 &手順
sensor model (f): 6 parameters
known calibration field: 3-antenna method
calibration points: 25 + 8 frequencies and
different inclination
determination of the sensor model parameters
with a least square fit
assessing deviation at 33 frequencies
determination of isotropy at x frequencies
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較正システム: ISO17025認証
較正誤差: < ±1.0 dB
周波数範囲: 750 MHz – 100 GHz
ISO/IEC 17025 認証- 2018年5月に受領
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スキャニングとフィールド再構成
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再構成
knowledge of E-field distribution on two
planes allows reconstruction of phase
plane wave decomposition in infinite plane
by Fourier transformation and subsequent
reconstruction of full-wave 3D distributions
フェーズ再構成のソリューションnovel and improved algorithm based on
Gerchberg–Saxton (GS) (R. W. Gerchberg and W.
O. Saxton, “A practical algorithm for the
determination of the phase from image and
diffraction plane pictures,” Optik 35, 237 (1972))
測定要件:2 planes (grid-step λ/4): 2 × 24 × 24points
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South Korea Workshop, Seoul, 20171027 29
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Demonstrator: H-Field Reconstruction from E-Field Magnitudes
¥
|Hx| |Hy| |Hz|
参照 (シミュレーション)
再構成
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認証ソース
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5G システム認証パッケージ: 10, 30, 60, および 90 GHz
10 GHz: 8.2 – 12.4 GHz horn, SMA female
interface, enclosed
30, 60, and 90 GHz: stand-alone fixed-
frequency sources integrated with horns,
enclosed, 12 V DC supply
IEC106 AHG10に適合
リリース済み
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Uncertainty Budget
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予備 Uncertainty Budget
¥
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システム評価
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Validation Sources (Compliant with IEC106 AHG10 Report)
2つの基本EMソース- electric dipoles
- magnetic dipoles (slots)
complex arrays
しかしシミュレーション用に明確に定義されている
Cavity Backed Array of DipolesPyramidal
Horn with Slot Array
周波数: 10, 30, 60 90 GHz
ラウンドロビン (12 labs)
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10 GHz Cavity Backed Array of Dipoles
2 mm 10 mm
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10 GHz Cavity Backed Array of Dipoles (続き)
normalized to 0-dBm radiated power
distanc
e
(mm)
simulated
Etotal Savg1cm2
(V/m) (W/m2)
measured
Etotal Savg1cm2
(V/m) (W/m2)
deviation
Etotal Savg1cm2
(dB) (dB)
2 49.1 1.09 42.1 1.45 -1.3 1.2
5 23.0 0.804 22.5 0.738 -0.2 -0.4
10 14.3 0.451 15.7 0.420 0.8 -0.3
20 14.5 0.468 15.4 0.391 0.5 -0.8
50 13.2 0.456 14.3 0.456 0.7 0.0
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90 GHz Cavity Backed Array of Dipoles
2 mm 10 mm
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90 GHz Cavity Backed Array of Dipoles (続き)
normalized to 0-dBm radiated power
distanc
e
(mm)
simulated
Etotal Savg1cm2
(V/m) (W/m2)
measured
Etotal Savg1cm2
(V/m) (W/m2)
deviation
Etotal Savg1cm2
(dB) (dB)
2 125 7.29 113 6.32 -0.8 -0.6
5 114 5.13 112 4.47 -0.2 -0.6
10 78.6 3.83 79.0 4.00 0.0 0.2
20 43.2 2.92 44.3 2.97 0.2 0.1
50 18.4 0.829 18.9 0.829 0.3 0.0
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90 GHz Pyramidal Horn with Slot Array
2 mm 10 mm
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90 GHz Pyramidal Horn with Slot Array (続き)
distanc
e
(mm)
simulated
Etotal Savg1cm2
(V/m) (W/m2)
measured
Etotal Savg1cm2
(V/m) (W/m2)
deviation
Etotal Savg1cm2
(dB) (dB)
2 82.2 8.31 80.0 8.82 -0.2 0.3
5 71.7 7.18 79.3 7.58 0.9 0.2
10 50.7 5.57 55.0 5.77 0.7 0.2
20 45.0 3.78 47.6 3.80 0.5 0.0
50 26.2 1.65 26.8 1.65 0.2 0.0
normalized to 0-dBm radiated power
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開発中のソリューション
R&Dパートナー-
-
IT'IS Foundation
SPEAG
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Forward Transformation Evaluation (FTE)
measurements on two or three planes for each
side of the phone
conservative averaged PD evaluator for
pSnavgxcm2 and pSnavgxcm2 based on
either-validated simulations
-measurements of each antenna group separately
(can be controlled individually with a code book)
evaluation of the exposures in 3D based on
advanced forward propagation techniques
evaluation of PD distribution on any virtual
surface (e.g., SAM head, ELI phantoms, face-
down)
1Q19に利用可能
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Validation of FTE: 30 GHz Cavity Backed Array of Dipoles
46
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7, 2019
Simulated vs. Measured Plane at 2 mm Simulated vs. Reconstructed XZ Plane
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最大暴露評価
measurements on two or three planes for each
side of the phone
conservative averaged PD evaluator for
pSnavgxcm2 and pSnavgxcm2 based on
either- validated simulations
- measurements of each antenna group separately
(can be controlled individually with a code book)
evaluation of the exposures in 3D based using
advanced forward propagation techniques
evaluation of PD distribution on any virtual
surface (e.g., SAM head, ELI phantoms, face-
down)
B-release available 2Q19
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SAR および出力密度の合成
measurements on two or three planes for each
side of phone
conservative averaged PD evaluator for
pSnavgxcm2 and pSnavgxcm2 based on either
- validated simulations- measurements of each antenna group separately (can
be controlled individually with a code book)
evaluation of the exposures in 3D based on
advanced forward propagation techniques
evaluation of PD distribution on any virtual surface
(e.g., SAM head, ELI phantoms, face-down)
PD および SARの合成
2Q19に入手可能
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Conformal評価
fully conformal surfacesの測定 (e.g.,
バーチャルリアリティ (VR) デバイスの凹面)
IEC TR 63170 の全機能
3Q19に利用可能
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送信電力 (Str )の評価
24 GHz未満の周波数の送信PD Str
評価
ファントムにおける送信電力Strを測定するためのcDASY6/7 モジュール
非常に近距離のトランスミッタにおける過大評価なし (<λ/2pi)
ICNIRP/IEEE に完全対応
4Q19に利用可能
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結論: 5G 無線暴露測定
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結論: 5Gsub6 (IEC 1528-62209)
拡大された周波数: 4 MHz - 10 GHz
MIMOを可能にする- SAR combiner for correlated & uncorrelated signals
- 特定ファントム- 腕- ゴーグル- etc.
sub6のギャップはなし
cDASY V6.10 リリース: 2Q19
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結論: 5G mm波 (>6 GHz)
PD には意味がなく10 GHz 未満では評価できない(SAR または Strを代わりに使用するべき)
EUmmWプローブ
検証された新しい再構成アルゴリズム(λ/5)
トレース可能な ISO 19025較正
システムチェックソース
検証ソース
不確実性: ~0.7 dB (k=1)
適合性試験準備
option: FTE 1Q19
option: Optimizer 2Q19
option: Combiner SAR and Power Density 2Q19
option: Conformal Evaluator 3Q19module: Transmitted Power Density (Str) 4Q19
MIC MRA International Workshop 2019, March 7, 2019 53