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77 GHz High Precision Radar
New Radar Technique to Measure short Distances to an Item in a Machinig Process
a German BMWI/AiF Project



A German BMWI/AiF project: (Oct. 09 - Sept. 11): The sensor developed aims at applications where the sensor is mounted very close - but contactless - to the target. In such case, neither FMCW nor pulse radar modes of operations are advantageous, since they would require very large bandwidths. On the other hand, in such a mounting situation only a single reflection is to be expected or - the other way around - the mounting situation has to be chosen in such way that (strong) multiple reflections are avoided. In this case the distance to the target can be measured by using the continuous wave (CW) mode of operation. The radar is sending an unmodulated waveform and measures the phase difference between the receive and transmit signals, which depends on the target’s distance. Since the phase is ambiguous the measurement range is limited to half the wavelength. For example, in the case of a frequency of 77 GHz, this measurement range of lamda/2 = 1.95 mm might be located at 1cm distance to the sensor with a measurement accuracy in the µm range. The sensor’s center frequency is therefore a tradeoff between the measurement range, which decreases with frequency, and the precision, which increases. A very important point for the design is the available space for the sensor. The LTCC frontend takes only 1.4mm x 30mm x 12mm including a broadband Vivaldi antenna. The LTCC process has been chosen for its miniaturization capabilities and robustness in harsh environments.

77GHz Radar Frontend and Antenna in LTCC (DuPont 9k7) for CW and FMCW Operation


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Project period:
October 2009 - September 2011
Project ID:
KF2403401WM9
Partners Country Description
novotechnik DE Projektleitung, Basisband
KIT DE Karlsruher Institut für Technologie, Antennen- und Messtechnik
IMST GmbH DE Radar-Schaltungsdesign, Aufbau- und Verbindungstechnik, Messtechnik
VIA electronic DE LTCC Fertigung, 9k7 Prozesstechnik
Nagel DE Maschinen- und Werkzeugbau, Anwender

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# References
Paper T. Bartnizek et al.: "An Investigation of the Process Stability of RF SiP made of DuPont 943 and 9k7", Ceramic Interconnect and Ceramic Microsystems Technologies, April 2011
Paper C. Rusch et al.: "W-Band Vivialdi Antenna in LTCC for CWRadar Nearfild Distance Measurements", European Conference on Antennas and Propagation, April 2011
Paper T. Klein, M. Faassen, Ch. Rusch, R. Kulke: "A 77GHz radar frontend in LTCC for short range, high precision industrial applications", ..., 2012


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