I Agree - Nearfield Systems Inc.

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SNF Radial Distance Sensitivity II• NF data shown below for three separate data setsNear-field amplitude of SNF_sim_21x13_Array_One_element_phase_rev2.nsiSNF_sim_21x13_Array_One_element_phase_rev.nsiHologram amplitude of SNF_sim_21x13_Array_One_element_phase_rev2.nsi0R=0.4m R=0.8m R=0.8m R=1.8m R=1.8m0.0R=0.8mR=1.8m-5-2.5-10-15-5.0Amplitude (dB)-20-25-30Amplitude (dB)-7.5-10.0-12.5-35-40-15.0-45-17.5-50-150 -100 -50 0 50 100 150Theta (deg)-20.0-0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30X (meters)July 2007 18
SNF Angular Span Sensitivity• < Hemi-spherical data set limits back projection resolution• Data shows effect of phase reversal of single elementexcitationHologram phase of SNF_sim_21x13_Array_One_element_phase_rev3.nsiHologram amplitude of SNF_sim_21x13_Array_One_element_phase_rev3.nsiSphere Hemi 160deg 120deg 800.0Sphere Hemi 160deg 120deg 80150-2.5100-5.050-7.5Phase (deg)0-50Amplitude (dB)-10.0-12.5-100-15.0-17.5-150-20.0-0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30X (meters)-0.30 -0.25 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30X (meters)July 2007 19
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: SNF Radial Distance Sensitivity I
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 and 28: PNF Amplitude sensitivity IIHologra
Page 29 and 30: Conclusions I• SNF back projectio
Page 31: Limitations• The data presented h

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