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Spherical Near-Field mmWave Measurement System
Model: SNF-FIX-1.0
Features
- X-band to mmWave measurements
- 3D far-field, near-field, and holographic patterns
- Measurement sphere up to 1.0 m (.3 ft) diameter
- Stationary AUT
- Automatic alignment capability
- High accuracy and position repeatability
- Far-field measurement options available
- Low cost and portable
High-Frequency Spherical Scanning with Integrated RF Stability
The SNF-FIX-1.0 is ideal for measuring stationary mmWave on-chip antennas and applications from 10 GHz up to 300.0 GHz. It uses a multi-axis high accuracy stepper motor-driven system to position the probe on a spherical surface while the antenna-under-test (AUT) remains stationary. The system is large enough to incorporate RF converter modules from OML and VDI as part of the probe carriage assembly and maintain a probe tip radius of roughly 500 mm (20 in.). Individual mmWave modules can be swapped to cover the relevant frequency bands, leaving the rack and cabling portion of the RF sub-system intact, thus making for a very modular and upgradable test system. All positioners contain integrated RF rotary joints, maximizing cable phase stability under test as well as slip-ring assemblies in the phi and theta axis positioners.
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Specifications
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Applications
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Capabilities
| Scanner Type | SNF–Serial Phi, Theta, Pol axes with Stationary AUT |
| Scan Area | 360° Phi and 270° Theta |
| Max AUT Diameter | 1.0 m (40 in.) diameter measurement sphere |
| Resolution | 0.01° Phi/Theta |
| Position Repeatability | 0.03° RMS Phi/Theta/Pol |
| Speed | 10/5/20°/sec Phi/Theta/Pol |
| PC Workstation | Windows computer with LCD monitor |
| Position Controller | ELE-PMC |
| RF Receiver Systems | NSI-MI VFA, Keysight PNA, Rhode & Schwarz ZVA |
| Rotary Joints | 26.5, 40, or 50 GHz (Phi, Theta, Pol) |
| Power | 500 W, 100–240 VAC switchable, 50/60 Hz |
Dimensions
(Scanner Only)
| Installed Max Envelope W x L x H | 2.6 m (102 in.) x 3.7 m (145 in.) x 2.7 m (106 in.) |
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| Transport Envelope W x L x H | 0.9 m (34 in.) x 2.4 m (96 in.) x 1.8 m (69 in.) |
| Nominal Chamber W x L x H | 4.0 m (158 in.) x 5.0 m (197 in.) x 3.0 m (118 in.) |
The SNF-FIX-1.0 supports NSI-MI, Keysight, and Rhode & Schwarz RF receivers and is capable of measuring amplitude and phase patterns from X-band to mmWave. The system includes a software workstation preloaded with NSI2000 Antenna Measurement Software and Windows 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.