The measurement of S-parameters over larger distances, i.e. the measurement ports are further or far apart from each other, always poses major challenges for the vector network analyzer (VNA). This type of measurement is typically encountered when characterizing long, permanently installed coaxial cables or waveguides, measuring antennas in Compact Antenna Test Ranges (CATR) or outdoor ranges, and determining antenna patterns through near-field scanning. The attenuation of the long coaxial cables requires the use of mixers to achieve lower attenuation at lower frequencies. However, with aperture near-field scanning, the cables are constantly moved, which means that the phase position changes constantly; this is an effect that significantly influences the accuracy of the near-field scanning concept.
During the presentation we explain the working of PhaseLync, this is an optical driven concept which makes it to be able to measure without loss of dynamic range all S-parameters over 100 meter distance of port 1 and port 2.
Ferdinand Gerhardes, Anritsu
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