Challenges of mmWave Measurements
Until recently, millimeter wave frequencies were traditionally dedicated to military applications with some commercial use for point to point microwave links. Sub-octave bandwidth waveguide was the preferred transmission line as millimeter wave capable coax cable and connectors were not available.
All that has changed in the past decade with technology improvements in semiconductors, components, cable, and connectors. It is now becoming common to see millimeter wave frequencies for commercial / consumer electronics. With this spread in millimeter wave applications, companies are now looking for new test solutions.