.pdf version
  12' x 12' (3.7 m x 3.7 m) Vertical Planar Near-field Measurement System


The 300V-12x12 is an ideal system for measuring medium and high gain antennas (>15 dBi) with medium sized apertures making it suitable for testing medium arrays or reflector antennas. The 300V-12x12 is based on an inverted “T” design and is constructed of steel. For high stability a welded cross-braced dual-rail base is used.
This robust design is easy to maintain and align, and highly accurate. Disassembly can be completed in one day. The high capacity probe carriage accommodates probes as low as L-band including optional roll and Z stages.


The system interfaces with a wide variety of RF equipment and is capable of measuring amplitude and phase patterns from L-band to mmWave bands. The system includes NSI Antenna Measurement Software.

The system software runs on an Intel based measurement workstation and provides automatic setup of scans based on measurement parameters and desired output. Measured data can be processed for far-field or holographic patterns yielding complete characterization of the antenna’s performance. A single data set provides information on antenna gain, side lobes structure, beam pointing and cross polarization.

The 300V-12x12 can be supplied with a variety of options and can be upgraded to allow for cylindrical or spherical measurements to expand system utility.

  • High Accuracy Planarity <0.003”(0.076mm) RMS
  • 12’ x 12’ (3.7 m x 3.7 m) Scan Area
  • Precision Rack and Pinion Drive
  • L-Band to mmWave Measurements
  • Inverted “T” Frame Design for High Accuracy
  • Far-field, Near-field and Holographic Patterns
  • Cylindrical and Spherical Options Available

Inverted “T” Frame (steel)
Drive System
Precision Stepper Motor; Rack and Pinion
Scan Area
12’x 12 ’ (3.7 m x 3.7 m)
<0.003” (0.076 mm) RMS
Corrected Planarity (Requires optional Structure Correction Software and Probe Translation Stage)
<0.002” (0.05 mm) RMS
Resolution (x,y) 0.001” (0.025 mm)
Position Repeatability 0.002” (0.05 mm) RMS
Scan Speed (X-Y) X - 10 in/s (0.25 m/s)
Y -15 in/s (0.38m/s)
Probe Carriage Capacity 125 lb. (57 kg) maximum recommended, WR1500
System Controller NSI controller with parallel I/O, and serial interface
Measurement Workstation Measurement workstation computer with large LCD monitor.
Stepper Motor Power Amplifier EIA 19” rack mount. (7” high x 14” deep)
Motor Cables Quick-connect; 40’ (12 m)
Scanner Absorber X-Y Absorber Kit (12” pyramidal cone)
Probe Optional See our list of standard Open Ended Waveguide (OEWG) Probes
Probe Mount Angle Bracket - allows mounting probe in “V” or “H” orientation
RF Cables Qty 4 - Flexible 25’ (7.6 m)
with SMA (m-m) coaxial
connectors; DC-20 GHz
Supported RF Devices NSI Panther Receiver Subsystem or selection of Keysight, Rohde & Schwarz and Anritsu VNA's (contact NSI for a complete list)
Power 100-240 VAC switchable, 50/60 Hz, 500 watts

Typical images of NSI-300V-12x12 Scanner


  • Width - 204" (5.2 m)
  • Depth - 114" (2.9 m)
  • Height - 197" (5.0 m)
  • System Weight - 5000 lb (2268 kg) approx.

NSI-300V-12x12 - 12' x 12' (3.7 m x 3.7 m) scanner system including X-Y stepper motor driven scanner with dual rail steel base, motor cable set, controller, PC based measurement workstation, motor drive electronics, NSI antenna measurement software, installation tool kit, system documentation and operation manual.


Opt 100 - 220VAC 50 Hz Operation
Opt 101 - European Version
NSI-SC-5621E - Probe Translation Stage, Extra Heavy Duty, 10 inch (250 mm) Travel
NSI-SC-5631 - Probe Roll Stage (High Capacity) with 26.5 GHz rotary joint
NSI-SW-5301 - Upgrade NSI Standard Edition Software to Professional
NSI-SW-5105 - Motion Tracking Interferometer (MTI) Software

For additional options and information see Scanner Options and Accessories

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