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Spherical Near-field Measurement System - 118 " (3.0 m) max AUT Dimension


Model 700S-75 is an ideal system for measuring medium and low gain antennas up to 118 inches (3 m) in diameter and is ideally suited to perform cellular and PCS band base-station antenna testing. The 700S-75 uses a dual-axis phi-over-theta high accuracy stepper motor based positioning system with an adjustable extension foot for probe support. The system is constructed of modular high strength aluminum and can support loads of up to 1000 pounds (454 kg). The location of the probe is adjustable to accommodate different configurations.


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 Model 700S-75 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 lobe structure, beam pointing and cross polarization.

The Model 700S-75 can be supplied with a variety of options to enhance system performance.

  • Full 360° Scan Area
  • L-band to mmWave Measurements
  • Automatic Electronic Alignment Capability (link)
  • Far-field, Holographic and Near-field Patterns
  • Far-field Measurement Options Available

Construction Theta, phi, and pol rotation stages with “L” bracket (aluminum)
Drive System Precision Stepper Motors
Scan Area Full spherical; Phi/Theta - 360°
Maximum Antenna Load 1000 lb (454 kg) at 9” CG off set
Maximum Antenna Diameter: 118 in (3 m)
Resolution 0.01° phi and theta
Position Repeatability 0.03° RMS
Rotational Speed (Theta and Phi) 30°/s Phi, 5 °/s Theta
System Controller NSI controller with serial and parallel I/O interfaces
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 Absorber Kit (5” pyramidal cone)
Probe Optional See our list of standard Open Ended Waveguide (OEWG) Probes
RF Cables 20 GHz RF Cables
Rotary Joints Qty. 3 - DC-26.5 GHz, (Phi, Theta, Pol)
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


  • Width - 106" (2.7 m)
  • Depth - variable
  • Height - 116" (2.9 m)
  • Weight - 2,500 lb (1,134 kg)

  • No additional links are currently available.

Please contact the NSI Sales department to order this product.

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