Print Email Facebook Twitter Noise Behavior and Implementation of Interferometer-Based Broadband VNA Title Noise Behavior and Implementation of Interferometer-Based Broadband VNA Author Mubarak, F.A. (VSL Dutch Metrology Institute) Romano, R. (Vertigo Technologies) Galatro, L. (Vertigo Technologies) Mascolo, V. (VSL Dutch Metrology Institute) Rietveld, Gert (VSL Dutch Metrology Institute) Spirito, M. (TU Delft Electronics) Date 2019 Abstract This paper analyzes and accurately models the complex noise behavior of vector network analyzers (VNAs) when measuring large-mismatch devices and subsequently shows how the VNA measurement noise performance is enhanced through implementation of a high-speed, broadband, active RF interferometer module. The presented VNA noise model provides a solid framework, benchmarked by measurement data, to analyze existing RF interferometer approaches. The performance improvement of the proposed interferometer implementation is then benchmarked in terms of magnitude and phase stability of the renormalized impedance level. A test bench employing the novel add-on RF interferometer module is presented and demonstrated to achieve high-speed cancellation of the scattered wave over a broad frequency band. The first experiment shows ultralow noise in a 1-18 GHz broadband measurement of co-planar waveguide 0.5-Ω and 5-k Ω impedance standards. Employing the proposed hardware setup improves the noise uncertainty for the 5-k Ω impedance standard by a factor of 8 and 20 at 1 and 18 GHz, respectively. In the second experiment, a factor of 2 height-resolution enhancement is achieved in a scanning microwave microscope when the RF interferometer module is added to the instrument. Subject Extreme impedance measurementimpedance mismatchmicrowave interferometrynanoelectronicsnanostructuresnoisevector network analyzer (VNA) To reference this document use: http://resolver.tudelft.nl/uuid:b299c21b-1fcb-4541-a7b8-f55a768c48ad DOI https://doi.org/10.1109/TMTT.2018.2874667 ISSN 0018-9480 Source IEEE Transactions on Microwave Theory and Techniques, 67 (1), 249-260 Part of collection Institutional Repository Document type journal article Rights © 2019 F.A. Mubarak, R. Romano, L. Galatro, V. Mascolo, Gert Rietveld, M. Spirito Files PDF 08566175_1_.pdf 4.94 MB Close viewer /islandora/object/uuid:b299c21b-1fcb-4541-a7b8-f55a768c48ad/datastream/OBJ/view