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NIST has developed a multi-purpose test range for performing several types of antenna testing including spherical, cylindrical, and planar near-field scanning, as well as extrapolation measurements. This range uses a commercial, off-the-shelf, six-axis robot and a laser tracker to accomplish highly accurate positioning that allows scanning up to 220 GHz. Near-field measurements require positioning...
This paper compares methods for computing consensus values of data sets. Three methods are used to analyze multiple data sets. The data sets are, on-axis gain measurements that have a large range of values and uncertainties. The appropriate method is dependent on characteristics of the data sets such as, the number of data sets, the spread of the data set values and spread of the uncertainty values...
This paper presents an overview of the development of the Configurable Robotic Millimeter-Wave Antenna (CROMMA) facility by the Antenna Metrology Lab at the National Institute of Standards and Technology (NIST). NIST set out to develop an antenna measurement facility that would be reconfigurable to different near-field antenna measurement geometries and perform antenna measurements from 100 to 500...
The continuing study of the flora of Colorado has turned up 27 new records and has made necessary 14 new combinations and the re-evaluation or reinstatement of 6 species.
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