The Antenna Metrology Laboratory at the National Institute of Standards and Technology, USA (NIST) is developing a robotically controlled near-field pattern range for measuring antennas and components from 50 GHz to 500 GHz. This new range is intended to address the need for accurate antenna pattern measurements for a variety of applications including remote sensing and imaging. This system incorporates a precision industrial six-axes robot, six-axes parallel kinematic hexapod, and high precision rotation stage. A laser tracker is used to determine position and calibrate the robot. The robotic positioning arm is programmable and allows scanning in a variety of geometries including spherical, planar, cylindrical, and perform in-situ extrapolation measurements, as well as, other user defined geometries. For planar geometry, the coverage is a rectangle 1.25 m x 2 m. For spherical, radii from 2 cm to 2 m are possible, while the coverage in θ is ±120° and in φ is ±180°. Robot positioning repeatability has been evaluated and determined to be about 30µm, and absolute positioning determination via the laser tracker is ~15µm. Specifics regarding the range evaluation are presented.
Proceedings Title: The 7th European Conference on Antennas and Propagation
Conference Dates: April 8-12, 2013
Conference Location: GOTHENBURG, -1
Conference Title: EuCAP 2013, the 7th European Conference on Antennas and Propagation
Pub Type: Conferences
Antenna, calibration, millimeter-wave, near-field, pattern, scanning, terahertz