Antenna Near Field Measurement Probe
Antenna Near Field Measurement Probe enables accurate near-field antenna characterization and electromagnetic field measurements. Designed for antenna testing systems, RF laboratories, radar research facilities, satellite communication development and microwave measurement platforms.
Precision Near-Field Measurement Probes for High-Accuracy Antenna Scanning
AO Microwave’s high-precision antenna near-field measurement probes are designed to sample electric and magnetic field distributions near active radiating apertures inside anechoic chambers. Precision-fabricated from high-grade aluminum and copper alloys, these open-ended waveguide (OEWG) probes feature sharp, hand-polished aperture edges and integrated high-absorptivity foam collars. Operating up to 110 GHz (WR-90 to WR-10), our near-field probes achieve low insertion loss, a low typical input VSWR of < 1.25:1 (with integrated matching), and excellent polarization purity across standard bands.
By establishing a highly localized, non-disruptive sampling point, our near-field probes enable precise spherical, planar, and cylindrical scanning. They are critical for VNA-based antenna calibrations, far-field mathematical transformations, and high-frequency antenna diagnostics.
| Part No | Frequency/GHz | VSWR (Max) | Connector Type | Material |
|---|---|---|---|---|
| AO1500-WOEWPNK | 0.49-0.75 | 2.2 | N Female | Aluminum |
| AO1150-WOEWPNK | 0.64-0.98 | 2.2 | N Female | Aluminum |
| AO975-WOEWPNK | 0.75-1.15 | 2.2 | N Female | Aluminum |
| AO770-WOEWPNK | 0.96-1.46 | 2.2 | N Female | Aluminum |
| AO650-WOEWPNK | 1.13-1.73 | 2.2 | N Female | Aluminum |
| AO510-WOEWPNK | 1.45-2.20 | 2.2 | N Female | Aluminum |
| AO430-WOEWPNK | 1.72-2.61 | 2.2 | N Female | Aluminum |
| AO340-WOEWPNK | 2.17-3.30 | 2.2 | N Female | Aluminum |
| AO284-WOEWPNK | 2.60-3.95 | 2.2 | N Female | Aluminum |
| AO229-WOEWPNK | 3.22-4.90 | 2.2 | N Female | Aluminum |
| AO187-WOEWPNK | 3.94-5.99 | 2.2 | N Female | Aluminum |
| AO159-WOEWPNK | 4.64-7.05 | 2.2 | N Female | Aluminum |
| AO137-WOEWPNK | 5.38-8.17 | 2.2 | N Female | Copper |
| AO112-WOEWPNK | 6.57-9.99 | 2.2 | N Female | Copper |
| AO90-WOEWPNK | 8.20-12.5 | 2.2 | N Female | Copper |
| AO75-WOEWPNK | 9.84-15.0 | 2.2 | N Female | Copper |
| AO62-WOEWPSK | 11.9-18.0 | 2.2 | SMA Female | Copper |
| AO51-WOEWPSK | 14.5-22.0 | 2.2 | SMA Female | Copper |
| AO42-WOEWP2.92K | 17.6-26.7 | 2.2 | 2.92mm Female | Copper |
| AO34-WOEWP2.92K | 21.7-33.0 | 2.2 | 2.92mm Female | Copper |
| AO28-WOEWP2.92K | 26.5-40.0 | 2.2 | 2.92mm Female | Copper |
| AO22-WOEWP2.4K | 33.0-50.0 | 2.2 | 2.4mm Female | Copper |
| AO19-WOEWP2.4K | 40.0-60.0 | 2.2 | 2.4mm Female | Copper |
| AO15-WOEWP | 50.0-75.0 | 2.2 | UG385/U | Copper |
| AO12-WOEWP | 60.0-90.0 | 2.2 | UG-387/U | Copper |
| AO10-WOEWP | 75.0-110.0 | 2.2 | UG387/UM | Copper |
Understanding Probe Correction & Scattering Mitigation
Near-field measurement probes operate by sampling localized field vectors at close physical distances. Because the probe is positioned inside the near-field zone of the Antenna Under Test (AUT), the probe itself can scatter electromagnetic waves, causing multiple reflections that distort the measurement.
To minimize these scattering errors, AO Microwave integrates high-performance absorptive foam collars around the outer metal body of the probe. Additionally, to compensate for the probe's own radiation pattern and polarization characteristics, we provide precise probe correction coefficients. Near-field scanning software uses these coefficients to mathematically subtract the probe's influence, ensuring high accuracy in the calculated far-field radiation patterns.
Target Applications & Operational Advantages
By providing localized field sampling with low scattering, our near-field measurement probes secure highly accurate antenna characterization:
Spherical, Planar & Cylindrical Scanning
Function: Samples near-field phase and amplitude vectors across predefined coordinate grids inside anechoic chambers.
Advantage: Precision-sharpened aperture edges minimize field disturbance, ensuring highly accurate near-to-far-field mathematical transformations.
Anechoic Chamber Field Mapping
Function: Maps field uniformity and quiet-zone performance inside RF anechoic chambers.
Advantage: Exceptional polarization purity and low VSWR enable precise, drift-free mapping of weak stray reflections.
Antenna Phase Center Calibration
Function: Locates and calibrates the physical phase center of high-frequency feed horns.
Advantage: Precision-aligned mechanical reference surfaces ensure highly repeatable positioning and alignment during testing.
Near-Field Measurement Probe FAQs
Need high-precision Near-Field Measurement Probes?
Specify your WR size, polarization (Single/Dual), connector interface, and calibration requirements — we'll quote in 24 hours.
