Contactless Vector Network Analysis with Printed Loop Couplers

Thomas Zelder, Bernd Geck, Michael Wollitzer, Ilona Rolfes, Hermann Eul

IEEE Transactions on Microwave Theory and Techniques, Vol. 56, No. 11, Part 2, pp. 2628-2634, Nov 2008


In this paper, an introduction to contactless vector network analysis is given. Furthermore, the implementation of a contactless measurement setup is presented using different printed coupling structures. The coupling structures are connected to a vector network analyzer (VNA) by means of conventional on-wafer probes, as well as planar-coaxial transitions. For the contactless method, conventional calibration algorithms are used to determine the scattering parameters of a device within a complex planar circuit. The contactless measured results are compared to results received with a conventional VNA and to simulation results obtained with a 3-D field simulator. These comparisons show that, especially for small coupling structures of approximately 1 mm, the results correspond well up to 20 GHz.

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Tags: Calibration technique, vector network analyzer