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Vector non-linear measurements emerged two decades ago, initiating a vast range of novel applications in microwave characterisation, modeling, and design. This paper focuses on its impact on microwave active device modeling. After sketching the evolution in instrumentation, the present capabilities are described. Today's developments are happening swiftly and on a large scale. As communication becomes more low-power, more wireless, and more bandwidth demanding, requirements for device models have evolved as well. In this paper, the present challenges in modeling and thus directions in instrumentation development are discussed.