Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 6, Issue 6, Pages 771-783Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2016.2602539
Keywords
Circularly polarized on-chip antenna; frequency-modulated continuous-wave (FMCW) monostatic radar; homodyne receiver; lens-integrated antenna; multiplier chain; radar 3-D radar imaging; SiGe heterojunction bipolar transistor (HBT) technology; silicon-integrated transceiver; submillimeter wave; terahertz (THz)
Funding
- German Research Foundation (DFG)
- European Commission within the project DOTSEVEN [316755]
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A complete circularly polarized 210-270-GHz frequency-modulated continuous-wave radar with a monostatic homodyne architecture is presented. It consists of a highly integrated radio-frequency transceiver module, an in-house developed linear-frequency chirp generator, and a data acquisition chain. The radar front end featuring a fundamentally operated x16 multiplier-chain architecture is realized as a single chip in 0.13-mu m SiGe heterojunction bipolar transistor technology with a lens-coupled circularly polarized on-chip antenna and wire-bonded on a low-cost printed circuit board. In combination with a 9-mm-diameter silicon lens, the module achieves an average in-band directivity of 26.6 dB. The measured peak radiated power from the packaged radar module is +5 dBm and the noise figure is 21 dB. For a 60-GHz frequency sweep, the radar achieves a range resolution of 2.57 mm after calibration, which is close to the theoretical bandwidth-limited resolution of 2.5 mm. With a simple scanning optical setup, this paper further demonstrates the 3-D imaging capability of the radar for detection of hidden objects with a remarkable dynamic range of around 50 dB.
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