I Agree - Nearfield Systems Inc.

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SNF Phase sensitivityPhase change in theback projected fieldfor excitation phasechange of a singlearray element.Hologram phase of SNF_sim_21x13_Array.nsi-100Ref 1deg 10deg 30deg-105-110-115Phase (deg)-120-125-130-135-140-0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25X (meters)July 2007 28
Conclusions I• SNF back projection resolution does NOT degradewhen probe to AUT distance is increased.• Back projection resolution DOES degrade whenangular span is reduced to < hemi-sphere of data.• Small changes in the array excitation vector can bedetected.July 2007 29
Page 2 and 3: Overview• Prior work• Simulatio
Page 4 and 5: Planar Near-field ScanJuly 2007 4
Page 6 and 7: Back Projection( )( , , ) ( , )iγ
Page 8 and 9: Far-field Expressionst ( k , k )A x
Page 11 and 12: Simulated array radiators.13 Elemen
Page 13 and 14: Orthogonal near-field pattern cutsN
Page 15 and 16: Single element with reversed phase1
Page 17 and 18: SNF Radial Distance Sensitivity I
Page 19 and 20: SNF Angular Span Sensitivity• < H
Page 21 and 22: SNF Angular Span Sensitivity - cont
Page 23 and 24: PNF Probe to AUT separation distanc
Page 25 and 26: PNF Amplitude sensitivity IHologram
Page 27: PNF Amplitude sensitivity IIHologra
Page 31: Limitations• The data presented h

I Agree - Nearfield Systems Inc.

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