Phase Modulated 61 GHz Backscatter Transponder for FMCW Radar-Based Ranging

Stein W, Aleksieieva A, Röhr S, Vossiek M (2014)

Publication Language: English

Publication Type: Conference contribution

Publication year: 2014

Conference Proceedings Title: 8th German Microwave Conference (GeMiC2014)

Event location: Aachen, Germany DE

ISBN: 978-3-8007-3585-3


Modulated backscatter transponders allow, low complexity, low power identification and ranging if an FMCW radar is used as a reader. Especially in industrial environments, modulation significantly increases ranging robustness by echo mitigation of passive / unmodulated reflectors. The 61 GHz ISM band is favorable for high resolution ranging due to the high available bandwidth. However, backscatter transponder design is challenging at mm-wave frequencies. In this paper, a low complexity mm-wave backscatter transponder design based on a single Schottky diode switch is introduced that allows for cost efficient manufacturing and low power consumption. A 3D full wave simulation of the proposed backscatter layout, comprising a model of the diode package, combined with its SPICE parameters in a co-simulation procedure, enables accurate circuit optimization. A complete prototype was built using planar technology that includes switch, clock generation and battery interface. Experimental results show an operating range of 20 m with a ranging uncertainty well below 25 mm at a 1 ms sweep duration of the FMCW signal. Transponder power consumption is as low as 2.5 mA with a supply voltage of 2 V.

Authors with CRIS profile

How to cite


Stein, W., Aleksieieva, A., Röhr, S., & Vossiek, M. (2014). Phase Modulated 61 GHz Backscatter Transponder for FMCW Radar-Based Ranging. In 8th German Microwave Conference (GeMiC2014). Aachen, Germany, DE.


Stein, Wadim, et al. "Phase Modulated 61 GHz Backscatter Transponder for FMCW Radar-Based Ranging." Proceedings of the 8th German Microwave Conference (GeMiC2014), Aachen, Germany 2014.

BibTeX: Download