Open Ended Rectangular Waveguide Probes
Open-ended Rectangular Waveguide (RWG) Probes are commonly used as near-field probes in planar and cylindrical near-field antenna measurements. The probe design is based on standard rectangular waveguide sizes and can be manufactured for any standard frequency band from 500 MHz up to 60 GHz. The radiation characteristics of these probes can be predicted well by an analytic model that is used for probe pattern correction.
NPM's RWG's are equipped with an integral coaxial connector, absorber panel, and a dedicated mechanical interface with standard flange.
All RWG's are supplied with a test report
including measurement results of the main characteristics:
- Reflection coefficient
- Sweep gain
- Sweep on-axis cross polarization
- Patterns at a series of frequencies across the band
CORRUGATED CIRCULAR WAVEGUIDE PROBES
Corrugated feeds are based on open-ended circular waveguide, with several frontal corrugations. As a result of optimized design and high precision manufacturing, these feeds possess rotationally symmetric radiation patterns with low back radiation and very low cross polarization. In standard single-pol configurations, the feeds are provided with integrated waveguide-to-coax adapters with SMA or K connectors. In dual-pol configuration, they are provided with Ortho-mode transducers with very low cross coupling. The feeds cover a standard waveguide band. Custom frequency bands are available on request.
These antennas satisfy the requirement of the spherical mode content (u=+/-1) and thus are ideal as probes for spherical near-field measurements. Their advantages over open-ended waveguides are: better matching, better suppression of wall reflections, less sensitive to mounting brackets, and thus can allow more accurate near-field measurements.
These types of antennas are ideal for:
- Spherical Near-Field Range Probes
- Compact Antenna Test Range Feeds
- Far-Field Antenna Test Range Sources
Standard Gain Horns (SGH)
Standard Gain Horns (SGH) are widely used as reference gain antennas and far-field test range sources, as well as linearly polarized standards for polarization and channel balance calibration of dual-pol near-field probes. Our robust designs cover from 500 MHz to 60 GHz in standard octave bandwidths. Our high accuracy manufacturing provides excellent radiation patterns with very low cross polarization, typically below -45 dB
Our SGH's are equipped with an integral coaxial connector, and circular mounting flange, to fit with our standard positioners. The horns are treated with an Alodine surface finish, and painted to ensure environmental protection
Each horn includes a full measurement report, including the following parameters
- Antenna pattern at center frequency
- VSWR reflection response
- Swept gain
- Swept on-axis cross-polarization