Test Platform
Millimeter-wave measurement system allows for the characterization of high-frequency components using beam-focusing elements rather than traditional waveguides. A quasi-optical bench employs lenses and mirrors to direct signals between a source and a receiver in free space. This setup is used for dielectric constant measurements or antenna pattern analysis at frequencies above 100 GHz.
The free-space environment eliminates the losses and parasitic effects found in cables or connectors.
Wave Manipulation
Signal propagation involves the use of Gaussian beam theory to design the path of the electromagnetic energy. On a quasi-optical bench, the signals are shaped by corrugated horns and focused by polyethylene lenses to minimize diffraction. This allows for the testing of small samples or components without the need for physical contact.
Polarization rotators and beam splitters can be added to the bench to analyze the complex behavior of the millimeter-wave signals.
Measurement Environment
Experimental accuracy depends on the precise alignment of the optical components along the signal axis. The quasi-optical bench is typically constructed on a vibration-isolated table to prevent mechanical shifts from affecting the results. Absorptive materials are placed around the bench to prevent reflections from the laboratory walls or equipment.
This configuration provides a controlled space for the development of advanced radar and sensing technologies.
