Abstract
There is a strong need for wideband and sensitive receivers in the terahertz (THz) region. This chapter focuses on the detection of continuous waves (CW) in the THz, using innovative bolometric sensors working as mixers for heterodyne reception with down conversion to the GHz range, as needed for radio astronomy, remote sensing, or passive imaging. In this case, the coupling to the incident THz radiation is accomplished by means of multi-octave planar micro-antennas. After selecting the antenna shape as angular, self-complementary, and/or self-similar, various antenna geometries are studied, namely, bow tie, Sierpinski fractal, sinuous, and log-periodic. Delivered power, directivity, and radiation pattern are discussed. According to seven criteria, the log-periodic antenna is preferred.
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Acknowledgments
This research was/is supported in part by (1) a Marie Curie EST Fellowship of the EC’s FP6 under contract # MEST-CT-2005-020692 and (2) the French National Research Agency (ANR) under contract # 2011 BS03 008 01. The authors wish to thank Dr N. Ribière-Tharaud (DRE-Supélec) for assistance in anechoic chamber tests.
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Türer, I., Dégardin, A.F., Kreisler, A.J. (2014). UWB Antennas for CW Terahertz Imaging: Geometry Choice Criteria. In: Sabath, F., Mokole, E. (eds) Ultra-Wideband, Short-Pulse Electromagnetics 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9500-0_42
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DOI: https://doi.org/10.1007/978-1-4614-9500-0_42
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