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An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers

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An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers An Introduction to Free-Field Measurements of Wireless Devices in Reverberation Chambers Kate A. Remley, Group Leader Metrology for Wireless Systems What is a Reverberation Chamber? . A shielded, highly reflective free-field test chamber What you can do with one: . Create known fields (EMC/susceptibility) . Radiated emissions and power (CW and modulated-signal) . Antenna parameters (G, efficiency, etc.) You can also do communication system tests . Receiver sensitivity . Throughput . EVM, BER, etc. DUT needs realistic channel 1 BER BER .01 32.8328 kHzkHz HighLow BERBER .01 0 45 90 135 180 225 270 315 360 Paddle angle (degrees) -40 NIST measurements of prototype 4G -60 NISTMIMO measurements cellular telephone of wireless antennas router -80 -25 dBm -35 dBm -45 dBm -55 dBm -65 dBm -25 dBm -35 dBm -45 dBm -55 dBm -100 Receivedpower (dBm) Receivedpower (dBm) 0 45 90 135 180 225 270 315 360 Paddle position (degrees) Fields in a Metal Box (A Shielded Room)* . In a metal box, the fields have well defined modal distributions. Some locations have very high field values . Some locations have very low field values * With thanks to Chris Holloway Fields in a Metal Box with Large, Rotating Scatterer (Paddle) Frozen Food • The paddle changes locations where the high and low field values occur • After one mode-stirring sequence, all locations in the chamber will have experienced nearly the same collection of field maxima and minima A “Statistical” Test Chamber . Quantities measured in the reverberation chamber are averaged over a mode-stirring sequence . Randomize fields with . Mode-stirring paddles . Changing physical position . Using multiple antennas: various locations, polarizations Reverberation Chambers Come in All Shapes and Sizes Lowest frequency of operation, uncertainties determined by chamber size, wall loss NASA: Glenn Research Reverberation Chamber Center (Sandusky, OH) with Moving Walls Chamber Electrical Characteristics Constructive and destructive interference for each -10 mode-stirring sample All Frequencies, one angle PCS Band, four angles -20 2 -30 • Frequency domain (|S | ): (dB) 21 2 -40 Reflections create multipath |S21| -50 Reverberation Chamber -60 Measurement 1 1.5 2 antenna Frequency (GHz) Mode-stirring paddle . Time domain (power Reference delay profile): Decay time antenna of reflections depends on Device Vector Network RF under RF Analyzer chamber reflectivity abs test abs P1 P2 Platform Original Applications . Radiated Immunity . Antenna efficiency . components . Calibrate RF probes . large systems . RF/MW Spectrograph . Radiated Emissions . absorption properties . Shielding . Material heating . cables . Biological effects . connectors . Conductivity and . enclosures material properties Wireless Applications . Multipath environments . Standardized over- . Rayleigh, Rician multipath the-air test methods channels: with/without . Radiated power of channel emulators mobile wireless devices . Time response: power . Receiver sensitivity delay profile, delay spread . Large-form-factor and . Channel models body-worn devices (with . Biological effects of phantoms) modulated-signal . Public-safety emergency exposure equipment . Gain from multiple antenna systems . TX or RX diversity . MIMO Cellular Wireless: Over-the-Air Tests Required . Network providers assess performance of every wireless device model on their network: . Total Radiated Power (TRP) . Total Isotropic Sensitivity (TIS) . OTA testing traditionally done in anechoic chambers Reverberation chambers can be used as well! Modulated Signals in RCs: What is different from EMC Testing? . Receiver needs a realistic “frequency flat” channel . Loading required: Add RF absorber to chamber . Coherence bandwidth should match DUT design . Spatial uniformity decreases . Position stirring required Reverberation Chamber: Real Channel: Loading Slows Variations Slow Variations with Frequency R 9 -20 -15 sUNLOAD ~ 10 dB TX1 to RX6 R |H(f)|2 (mean) = -58 dB -20 10 -30 2 -25 Mean |H(f)| R5 -40 2 s ~ 5 dB Mean |N(f)| -30 2 (dB) 2 (dB) Std Dev |H(f)| -35 -50 | 2 21 T1 R12 |S -40 |H(f)| T s -60 3Loaded = LOAD -45 ~ 5 dB -70 -50 Unloadedbroader ChamberT2 CBW Loaded Chamber: 7 abs -55 -80 0 1 2 3 4 730 740 750 760 770 780 790 800 Bandwidth (MHz) Frequency (MHz) Cellular Device Testing: How is it done? . Reference measurement provides: . Chamber loss: Transfer function Gref of chamber . Spatial uniformity of averaged fields in chamber . Rotating platform: Reverberation Chamber Gref = <Gref,p> Measurement . DUT measurement: antenna Mode-stirring paddle . ReverberationSame set Chamber-up as Ref Measurement Calibrated antenna G cable . Assume GDUT = Gref ref GDUT Mode-stirring paddle Reference antenna Reference Device antenna RF under RF Device abs abs Vector Network test Base station RF under RF Analyzer abs test abs Platform emulator P1 P2 Platform Total Radiated Power from Cell Phones Data from CTIA working group shows good agreement between anechoic and reverberation chambers TRP Comparison, Free Space, Slider Open, W-CDMA Band II Cell phone 5.00 4.50 AC RC 4.00 Anechoic Lab A Band II 3.50 Anechoic Lab B Band II 3.00 Anechoic Lab C Band II Reverb Lab A Band II 2.50 Reverb Lab B Band II 2 dB 2.00 Reverb Lab C Band II Relative TRP Relative 1.50 Reverb Lab D Band II 1.00 Reverb Lab E Band II 0.50 0.00 Low Mid High Reference Channel +/-2 dB is threshold TRP Comparison, Free Space, Slider Open GSM850 5.00 4.50 AC RC 4.00 Anechoic Lab A GSM850 3.50 Anechoic Lab B GSM850 3.00 Anechoic Lab C GSM850 • Cell phone Reverb Lab A GSM850 2.50 Reverb Lab B GSM850 2.00 testing: ca. 2010 Reverb Lab C GSM850 RelativeTRP 2 dB 1.50 Reverb Lab D GSM850 • But in 2016… 1.00 Reverb Lab E GSM850 0.50 0.00 Low Mid High Channel The Machine-to-Machine Revolution . By 2019: 11.5 billion mobile devices (world population 7.6 B)* . M2M/IoT growing faster than smart phones . 2014: 495 million . 2019: 3 billion * Source Cisco Testing Large Form-Factor Devices . Integrated antennas: test of entire device required . Reverberation chamber: now only option for SISO tests . Device placement not critical within chamber . Relatively low cost . OTA test issues: Large, lossy DUTs Loading Decreases Spatial Uniformity Loading helps with demodulation but introduces other “nonideal” effects RelativePDP for mean different power loading at Monopole12 at Monopole2 -20Unloaded 1 RF 2 RF 3 RF 4 RF 5 RF 6 RF -70 Unloaded RF Absorbers Unloaded 18 TwoBoxes 18 -22-75 Metallic Boxes TwoBoxes Theoretical StDev FourBoxesFourBoxes SixBoxesSixBoxes -24-8017 17 EightBoxesEightBoxes TenBoxesTenBoxes -26-85 16 TwelveBoxesTwelveBoxes16 OneRF -28 OneRF -90 TwoRFTwoRF 15 ThreeRF 15 -30 ThreeRF -95 FourRFFourRF FiveRF -3214 FiveRF 14 -100 SixRFSixRF -34 (dB) Power Relative Decreases spatial Relative mean power (dB) power mean Relative -10513 13 uniformity -36-110 12 IncreasesDecreases chamber decay loss time 12 -38-115 (can(replicates calibrate out)real world) 11 11 -40Unloaded 2 Bx 4 Bx 6 Bx 8 Bx 10 Bx 12 Bx 1500-120 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 0 1 2 Frequency3 4(MHz) 5 6 7 8 s increasesTime with(s) loading S. van de Beek, et al., Characterizing large-form-factor (in percent) devices in a reverberation chamber, EMC Europe 2013. Loading and Position Stirring go Hand in Hand . Spatial lack of uniformity a necessity: . unstirred energy . correlated samples: paddle position, location, frequency . Industry uses position, polarization, source stirring to improve estimate of DUT performance • Chamber reference for PCS channel 9262 (1.850-1.854 GHz) • VNA : 9 spatially uncorrelated positions • Combinations of all sets of data Set-up: Absorber Placement • Standing on floor • Lying on floor • Stacked Considerations: • Exposed absorber surface area • Exposed metal surfaces • Proximity to antennas 18 Comparable Loading, Different Uncertainty PCS band measurement (~1950 MHz) . Load chamber for approximately the same CBW . Chamber loss approximately the same as well . 휎 is higher when absorbers lie on floor 퐺ref . Less exposed metal surface . Higher proximity effect Distributed on Distributed on Stacked Floor: Standing Floor: Lying CBW (MHz) 3.13 3.32 3.48 No. abs 3 7 4 퐺ref (dB) -29.46 -29.69 -29.78 휎 (dB) 퐺ref 0.15 0.30 0.35 Set-up: Stirring Sequence is Important . Stirring mechanisms influence results differently . Each chamber will have a different “mix” of optimal stirring 13 7 x steps steps y Cart 3 (dashed) Cart on ground 1 Cart 2 x y Measure effects of paddle angle and antenna position at three locations in a loaded chamber Measured and modeled uncertainty at the three locations K.A Remley, R.J Pirkl, H.A Shah, and C.-M. Wang, "Uncertainty from choice of mode-stirring technique in reverberation-chamber M = antenna positions measurements," IEEE Trans. Electromagnetic Compat., vol. 55, no.6, pp. 1022-1030, Dec. 2013. N = paddle angles Set-up: Antenna Placement is Important Unstirred energy: increased K factor, reduced spatial uniformity Antenna placement guidelines: Relationship between . Orient away from each other antennas and absorber . Cross polarize is also important . Aim toward stirrers DUT: Unknown pattern? 3 Cell Band 2 TX/RX pairs PCS Band 1 0 Dir/Omni -1 -2 Omni/Dir K K Factor (dB) -3 -4 Dir/Dir Omni/Omni -5 1 2 3 4 Antenna Configuration Good Set-up = Good Results . Must account for . placement and amount of RF absorber . number, type, and correlation of mode-stirring samples . antenna type and placement . Good comparison between chambers: throughput vs. input power Lab Good Nominal Bad AC1 -100.50 -99.00 -94.20 lab1, R1 lab1, R1 lab1, R2 lab1, R2 lab1, R3 AC2 -102.80 -100.00 -94.20lab1, R3 lab2, R1 lab2, R1 lab2, R2 lab2, R2 lab2, R3 RC1 -103.58 -100.29 -93.40lab2, R3 lab3, R1 lab3, R1 lab3, R2 lab3, R2 lab3, R3 RC2 -101.46 -98.22 -92.12lab3, R3 RC3 -101.93 -98.66 -90.91 Two devices tested in three different reverberation chambers Spread+/- 1.54 From1.04 MOSG1406041.65 Results show good repeatability and From MOSG131207 comparison with anechoic methods TRP for Large M2M Device .
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