Poik, M., Hackl, T., Di Martino, S., Berger, B. M., Sattler, S. W., & Schitter, G. (2024). A contactless method for measuring amplitude and phase of RF voltages up to 26.5GHz. IEEE Sensors Journal. https://doi.org/10.1109/JSEN.2024.3354322
RF sensing; Contactless voltage measurement; Phase measurement; Wide bandwidth; Voltage probe
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Abstract:
In this paper, a method for contactless amplitude and phase measurements of local voltages within microwave devices is developed. A conductive cantilever probe with a sharp tip is used as capacitively coupled sensor to record radio frequency (RF) voltages at well-defined distances between the probe tip and the device surface. The recorded voltage is compared to a nonlinear capacitance vs. distance model to separate the local voltage on the device from long-range cross-talk contributions. To determine both amplitude and phase of the local voltage, a complex parameter identification procedure is proposed and implemented. Thus, amplitude and phase measurements of local voltages at μm spatial resolution are enabled. Additionally, the cantilever probe is integrated on a PCB to enable the transmission of RF signals from the tip to the detector over a wide bandwidth. The proposed method, together with the developed probe, are verified by performing voltage measurements on an open-ended transmission line at frequencies from 1 GHz to 26.5 GHz. The measurements closely match the analytically calculated standing wave patterns on the transmission line.
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Project (external):
FFG
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Project ID:
883916
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Research Areas:
Mathematical and Algorithmic Foundations: 50% Sensor Systems: 50%