| submitted | available | document details (if available) | source link |
|---|---|---|---|
| July 09 2018 | Intel Corporation Microsoft® Word 2013 |
| various | Simulations and Measurements Compairsons rev01 | RF Exposure Info | 1.52 MiB | / July 09 2018 |
Intel Model: 18265NGW FCC ID: PD918265NG Intel Model 18265NGW Embedded Inside a notebook brand Dell Model P29S WiGig Subsystem with RFEM 3 Simulations and measurements Comparisons and Compliance Descriptions Report July 2018 Revision 1.0 Simulations and Measurements Comparisons and Compliance Descriptions Report Notice:
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All rights reserved. 2 Simulations and Measurements Comparisons and Compliance Descriptions Report Contents Document Scope .............................................................................................. 5 Introduction ............................................................................................. 5 1.1 1.2 Associated Documents............................................................................... 5 Near-Field Measurements supporting the RF Exposure Power Density simulations ...................................................................................................... 6 Introduction ............................................................................................. 6 2.1 Probe Characteristics ................................................................................. 6 2.2 Total Field and Power Flux Density Reconstruction ........................................ 7 2.3 2.4 Measurement configurations ...................................................................... 7 Measurement results ................................................................................. 8 2.5 2.6 Conclusion ............................................................................................. 18 Compliance Assessment ................................................................................ 19 List of Tables Table 1 Abbreviations............................................................................................... 3 Table 2 Near Field probe Characteristics ..................................................................... 6 Table 3 Test Configurations ...................................................................................... 7 Table 4 Case 1#: Simulation Vs. test results @ 5 mm. ................................................ 8 Table 5 Case 2#: Simulation Vs. test results @ 5 mm. ................................................ 8 Table 6 Case 3#: Simulation Vs. test results @ 5 mm. ................................................ 9 Table 7 Case 4#: Simulation Vs. test results @ 5 mm. ................................................ 9 Table 8 - Case 5#: Simulation Vs. test results @ 5 mm. .............................................. 10 Table 9 Case 6#: Simulation Vs. test results @ 5 mm. .............................................. 10 Table 10 Summary of simulation results for RF exposure compliance ........................... 19 List of Abbreviations Abbreviation Definition Table 1 Abbreviations Antenna Azimuth Base Band Beam Forming Bluetooth Bandwidth Central Processing Unit Elevation Electro-Magnetic Ant Az BB BF BT BW CPU El EM 3 Simulations and Measurements Comparisons and Compliance Descriptions Report Abbreviation Definition GHz IF MAC M.2 Gigahertz Intermediate Frequency Media Access Control M2: Formerly known as Next Generation Form Factor (NGFF); used as specification for connectors of the expansion cards mounted on computer mmWave Millimeter Wave PC PCIe R&D RF Personal Computer Peripheral Component Interconnect Express; a PCI Special Interest Group standard Research and Development Radio Frequency RFEM 3 Third-generation Radio Front End Module RFIC RX SKU SoC TDM TPC Radio Frequency Integrated Circuit Receive Stock Keeping Unit, specific product model version System-on-Chip Time Division Multiplexing Transmit Power Control T/R SW Transmit/Receive Switch TX Transmit WiGig Wireless Gigabit Alliance the alliance that promoted the 60GHz into 802.11ad standard. Terms and Definitions Sub-array: A predefined group of radiating elements that are excited simultaneously with same amplitude and possibly different phases. There are three sub-arrays, and each one of them includes between, 10 to 12 of the 24 elements of RFEM 3. 4 Simulations and Measurements Comparisons and Compliance Descriptions Report Document Scope 1.1 Introduction This report is submitted to support the compliance with the FCC rule located in Title 47 of the Code of Federal Regulations (CFR), parts 2.1093 and 15.255(g), of Intel 18265NGW WiGig module (FCC ID: PD918265NG), including an active antenna array, embedded inside the Dell model P29S. Per the location of the active antenna array (a.k.a. RFEM 3) in the Dell model P29S platform, the distance between the antenna arrays to the body of an end user, at the closest contact point, will be in the near field. In order to prove that during typical use the energy goes in most cases away from the human body, several tests of beam-forming behavior were performed under different use cases conditions. The results are presented in document [3]. These tests are supported by a determination of the near-field power average density performed using an EM simulation supported by a near field measurement. An EM simulation that includes the RFEM 3 transmitter model embedded inside the Dell model P29S is used to determine the worst case configuration and the correspondent near field power density. This worst case power density is considered as a conservative case because the energy is always oriented toward the human body, this latter is also supported by near field measurements. Due to the range of variations and uncertainty introduced by measurement and simulation, the results can only be applied to supplement each other, in conjunction with the beam-
forming mitigation results, through qualitative comparison and extrapolation to establish compliance at the device surface. The simulation method and the simulation results are described in the document [3]. The near field measurement system details are described in the document [2] and the comparison between simulation and measurement are shown in this document. 1.2 Associated Documents This Simulations and Measurements Comparisons and Compliance Descriptions Report and documents called reference [2] and [3] are not confidential; relevant details and explanations that qualify for confidentiality are included separately in the operational description document called reference [1].
[1] "161006-Dell P29S - Theory of Operation Report".
[2] "161006-Dell P29S - Near Field Measurement Report".
[3] "161006-Dell P29S - MPE Simulation Report". 5 Simulations and Measurements Comparisons and Compliance Descriptions Report Near-Field Measurements supporting the RF Exposure Power Density simulations 2.1 Introduction In this section, the near field power density measurement performed using the worst case antenna phases found by simulation is presented. This near field measurement supports the simulation presented in [2]. Indeed, because the measurement results are unavailable at distances closer than 2 mm, the comparison between simulation and measurement is performed at 5 mm from the evaluation plane. A near-field RF exposure system from SPEAG is used to perform these measurements. 2.2 Probe Characteristics The probe consist of two dipoles (0.8 mm length) optimally arranged with different angles
(1 and 2) to obtain pseudo-vector information, printed on glass substrate protected by high density foam that allows low perturbation of the measured field. Three or more measurements are taken for different probe rotational angles, deriving the amplitude and polarization information. The probes characteristics are illustrated in Table 2 Table 2 Near Field probe Characteristics Frequency Range Length Probe tip external diameter 750 MHz 110 GHz1 320 mm 8 mm Probes two dipoles length 0.9mm Diode loaded Probes substrate Distance between diode sensors and probes tip Axial Isotropy Maximum operating E-field Quartz 0.9 x 20 x 0.18mm
(r=3.8) 1.5 mm 0.6 dB 3000 V/m Lower E-field detection threshold 5 V/m @ 60 GHz Minimum Mechanical separation between probe tip and a Surface Calibration reference point 0.5mm Diode Sensor More details about the measurement system are found in reference [2]. 1 The probe calibration range is 750 MHz 90 GHz 6 Simulations and Measurements Comparisons and Compliance Descriptions Report 2.3 Total Field and Power Flux Density Reconstruction Computation of the power density in general requires knowledge of the electric (E-) and magnetic (H-) field amplitudes and phases in the plane of incidence. Reconstruction of these quantities from pseudo-vector E-field measurements is feasible, as they are constrained by Maxwell's equations. The reconstruction algorithm developed by the system manufacturer, together with the ability of the probe to measure extremely close to the source without perturbing the field, permits reconstruction of the E- and H-fields as well as of the power density on measurement plans located as near as 0.5 mm away in the frequency band of 60 GHz. The average of the reconstructed power density is evaluated over a circular area in each measurement plane. The area of the circle is defined by the user; the default is 1 cm2. 2.4 Measurement configurations The near field measurement is performed on the six highest maximum spatially averaged power density found among the thirty six calculated worst cases (3 channels x 3 sub-arrays x 2 first worst-cases x 2 evaluation planes) showed in reference [3]. The test configurations are summarized in Table 3. Table 3 Test Configurations Measurement Configuration EUT Dell Model P29S Measured cases Six highest worst cases* found in simulation:
Case 1#
Case 2#
Case 3#
Case 4#
Case 5#
Case 6#
Evaluation Plane Sub-array Channel Worst-
case Phase Config.*
Edge Edge Base Edge Base Base 1 1 3 3 3 1 2 2 2 2 2 2 1 2 1 1 2 1 Ph1 #2 Ph1 #11 Ph2 #8 Ph1 #8 Ph2 #17 Ph2 #2 Measurement Distances /
Resolution 5 mm / 1.24 mm Scan Plan 4.34 x 4.34 cm2
* See Table 7, Table 8, Table 13 and Table 14 in reference [3]
7 Simulations and Measurements Comparisons and Compliance Descriptions Report 2.5 Measurement results Tables 4 to 9 show the comparison between simulation and measurement for the six measured worst-cases at 5 mm distances from the evaluation plane. Simulation and measurement are both peak phasors. All results are calculated at 100 % duty cycle. Table 4 Case 1#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 87.667 79.689 0.829 H-field (A/m) 5 mm 0.239 0.242 0.107 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 1.177 0.698 2.267 0.373 0.419 0.500 8 Table 5 Case 2#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 87.277 69.504 1.978 H-field (A/m) 5 mm 0.246 0.227 0.687 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 1.143 0.582 2.936 0.323 0.324 0.013 Simulations and Measurements Comparisons and Compliance Descriptions Report Table 6 Case 3#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 101.043 105.916 0.409 H-field (A/m) 5 mm 0.302 0.221 2.708 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 1.703 1.105 1.878 0.515 0.302 2.309 Table 7 Case 4#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 61.123 66.295 0.705 H-field (A/m) 5 mm 0.172 0.173 0.048 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 0.591 0.531 0.470 0.217 0.231 0.271 9 Simulations and Measurements Comparisons and Compliance Descriptions Report Table 8 - Case 5#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 97.845 93.564 0.389 H-field (A/m) 5 mm 0.291 0.222 2.364 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 1.458 1.034 1.491 0.446 0.288 1.898 Table 9 Case 6#: Simulation Vs. test results @ 5 mm. Measurement Distance (mm) Simulated Measured Max. Deviation
(dB) E-field (V/m) 5 mm 91.853 77.309 1.497 H-field (A/m) 5 mm 0.254 0.201 2.057 Single-point PD (mW/cm2) Average PD
(mW/cm2) 5 mm 5 mm 1.291 0.766 2.265 0.398 0.225 2.468 10 Simulations and Measurements Comparisons and Compliance Descriptions Report Figures below show the comparison at 5 mm from the evaluation plane, between the simulation and the near field measurement in terms of E-Field, H-Field, Single-point Power Density and Spatially Averaged Power Density at 100 % duty cycle for the six highest worst cases. Note that the fields results presented in the figures below consider a peak phasor for electromagnetic fields for both simulation and measurement. 11 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #1 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 0.829 dB H-field (V/m) @5 mm Deviation of Max Value: 0.107 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 2.267 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 0.500 dB 12 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #2 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 1.978 dB H-field (V/m) @5 mm Deviation of Max Value: 0.687 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 2.936 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 0.013 dB 13 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #3 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 0.409 dB H-field (V/m) @5 mm Deviation of Max Value: 2.708 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 1.878 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 2.309 dB 14 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #4 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 0.705 dB H-field (V/m) @5 mm Deviation of Max Value: 0.048 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 0.470 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 0.271 dB 15 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #5 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 0.389 dB H-field (V/m) @5 mm Deviation of Max Value: 2.364 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 1.491 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 1.898 dB 16 Simulations and Measurements Comparisons and Compliance Descriptions Report Case #6 - DISTANCE = 5 mm Simulated Measured E-field (V/m) @ 5 mm Deviation of Max Value: 1.497 dB H-field (V/m) @5 mm Deviation of Max Value: 2.057 dB Localized free space PD (mW/cm2) @ 5 mm Deviation of Max Value: 2.265 dB Spatially Averaged PD (mW/cm2) @ 5 mm Deviation of Max Value: 2.468 dB 17 Simulations and Measurements Comparisons and Compliance Descriptions Report 2.6 Conclusion The near field measurement shows a good correlation with the near field simulation with a maximum deviation below 3 dB for the measured distances. 18 Simulations and Measurements Comparisons and Compliance Descriptions Report Compliance Assessment The goal of the beam-forming tests presented in chapter 3 of [3] is to determine the likelihood that energy would go towards or away from the human body during typical use. It was demonstrated that in the vast majority of the cases, over typical usage/height/distances, the chosen sub-array directs energy away from the body. As further supplemental compliance supporting information, numerical simulation results in Appendix A of document [3] show that worst case power density is below the RF exposure FCC limit. The simulation results are supported by near field measurement using a near field probe. Because measurement results are unavailable at distances closer than 2 mm by probe limitation, the comparison between simulation and measurement is performed at 5 mm from the evaluation plane. The results were presented in this document. Table 10 shows the simulated maximum spatially averaged power density, over 1cm2 in the evaluation plane of the Intel 18265NGW module, embedded in the Dell model P29S. Table 10 Summary of simulation results for RF exposure compliance Parameter Total conducted power Value 6.0 dBm Maximum spatially averaged power density, over 1cm2 - Simulation at 100% Duty Cycle 0.794 mW/cm2 Maximum TX duty-cycle 70%
Maximum spatially averaged power density, over 1cm2 - Simulation at 70% Duty Cycle 0.556 mW/cm2 Therefore, with 0.556 mW/cm2 spatially averaged power density value, Intel 18265NGW module, embedded in Dell model P29S, complies with FCC rule located in Title 47 of the Code of Federal Regulations (CFR) parts 2.1093 and 15.255(g). 19
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