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MARS Reflection Suppression Software


Reflections in antenna test ranges can often be the largest source of measurement errors, dominating all other error sources. The NSI-SW-5109 MARS Reflection Suppression Software uses a new technique developed by NSI to suppress reflections from many sources in far-field ranges, and cylindrical & spherical near-field antenna test ranges. The technique, named Mathematical Absorber Reflection Suppression (MARS), is a post-processing technique that involves analysis of the measured data and a special filtering process to suppress the undesirable scattered signals. The technique is a general technique that can be applied to any spherical range. It has been used in a large hemispherical automotive antenna range implemented by NSI for Nippon Antenna in Itzehoe Germany (link), as well as for many other customers. It has also been applied to extend the useful frequency range of microwave absorber in anechoic chambers.


The MARS software can suppress and/or remove reflections from reflection sources such as a radome or gantry in a far-field, cylindrical or spherical near-field range, as well as improve on the performance of a system in a conventional anechoic chamber. There is no additional hardware required to use the technique and a 10 dB to 20 dB improvement in performance can typically be achieved. The technique and its implementation and validation is further described in a number of technical papers presented by NSI at the Antenna Measurement Techniques Association (AMTA) annual symposium listed below :

2005 - "Reflection Suppression in Large Spherical Near-field Range"
2006 - "Simplified Spherical Near-Field Accuracy Assessment" (An AMTA 2006 Best Paper)
2006 - "Optimization of a Spherical Near-Field System for Measurements in the UHF Frequency Range"
2007 - "Mission to MARS - In Search of Antenna Pattern Craters"
2008 - "Mathematical Absorber Reflection Suppression (MARS) for Anechoic Chamber Evaluation & Improvement"
2009 - "Reflection Suppression In Cylindrical Near-Field Antenna Measurement Systems – Cylindrical Mars"
2009 - "Improving and Extending the MARS Technique to Reduce Scattering Errors"
2010 - "Advances in Cylindrical Mathematical Absorber Reflection Suppression"
2010 - "Extension of the Mathematical Absorber Reflection Suppression Technique to the Planar Near-Field Geometry"
2011 - "Application of Mathematical Absorber Reflection Suppression to Planar Near-field Antenna Measurements"
2011 - "Application of Mathematical Absorber Reflection Suppression to Direct Far-Field Antenna Range Measurements"
2011 - "Advances in Planar Mathematical Absorber Reflection Suppression" (An AMTA 2011 Best Paper)
2012 - "Examination of Far-Field Mathematical Absorber Reflection Suppression through Computational Electromagnetic Simulation"

  • Suppression of chamber and system reflections
  • Suppression of radome and gantry reflections
  • Typical improvement of 10 to 20 dB in reflection levels
  • Improved Gain and Directivity measurement results
  • Improved side lobe and cross-polarization results

Measurement types NSI-SW-5109 Reflection Suppression software can be added to any NSI spherical NF measurement system
Directivity vs. Frequency Showing MARS Improvement

NSI's MARS software used to improve gain and directivity measurements in a spherical near-field measurement system in an open lab environment with


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NSI-SW-5109 - MARS Reflection Suppression Software

Nearfield Systems, Incorporated
19730 Magellan Drive, Torrance, CA 90502, USA, Tel: 310.525.7000, Fax: 310.525.7100
Email: sales@nearfield.com. Visit our website: www.nearfield.com