Extending the Measurement Plane in Vector Network Analysis
應用說明
Most network analysis is performed on the test bench or in a production environment. In these situations, all ports of the device-under-test (DUT) are readily available to the vector network analyzer (VNA).
In contrast, a variety of applications place a greater distance between the VNA and the DUT. Examples include radar test ranges; in-building, airborne or shipboard RF distribution systems; and satellite communication terminals. Even with the best-performing coaxial cable, high-frequency signals will suffer tremendous attenuation over long spans. The most common solution is to downconvert the stimulus and response signals; however, this introduces mixing products that must be dealt with to ensure accurate measurement results.