Mathematical Absorber Reflection Suppression (MARS) for ...
Mathematical Absorber Reflection Suppression (MARS) for ... Mathematical Absorber Reflection Suppression (MARS) for ...
Mode Amplitude in dBMARS Mode AnalysisSpherical Modes for M=1• Spherical near-field to far-fieldtransformation involves sortingmeasured energy into sphericalmodes• Higher order modes are caused byreflections and can be filtered outif identified to be outside thephysical boundary of the antenna• Plot at right shows• Normal SNF modes• Modes after phase center trans.• Mode cutoff chosen based onphysical aperture size limit0-5-10-15-20-25-30-35-40-45-50-55-60-65-70Meas Trans maxmodes = 610 20 30 40 50 60Mode N Number14
Key MARS Requirements• Over sampling the data in Theta and Phi helps the process• Offsetting antenna phase center helps the process• Need to estimate or determine the phase center of the AUT• Not required for MARS• Knowledge of the AUT pattern• Knowledge of the test range configuration• Not frequency limited15
- Page 1 and 2: Mathematical Absorber Reflection Su
- Page 3 and 4: NSI‟s New SNF Chamber• NSI-700S
- Page 5 and 6: Amplitude (dB)Plot Subtraction Expl
- Page 7 and 8: Simple Chamber Reflection Test• T
- Page 9 and 10: Typical AUT Offset Test ResultWR Si
- Page 11 and 12: 360 phi vs. 180 phi SNF ScanningAUT
- Page 13: MARS Processing• MARS uses the st
- Page 17 and 18: dBError Level & Improvement for DLP
- Page 19 and 20: dBError Level Improvement for WR-28
- Page 21 and 22: Amplitude (dB)Amplitude (dB)Open La
- Page 23 and 24: Open Lab Test Results - WR-1500 SGH
- Page 25 and 26: MARS Improvement SummaryAntenna Ave
Key <strong>MARS</strong> Requirements• Over sampling the data in Theta and Phi helps the process• Offsetting antenna phase center helps the process• Need to estimate or determine the phase center of the AUT• Not required <strong>for</strong> <strong>MARS</strong>• Knowledge of the AUT pattern• Knowledge of the test range configuration• Not frequency limited15
Change language