Brown, E. R., Lee, A. W. M., Navi, B. S., & Bjarnason, J. E. (2006). Characterization of a planar self-complementary square-spiral antenna in the THz region. Microwave Opt Technol Lett, 48(3), 524–529.
Abstract: This paper describes a compact, self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (~9 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere. The driving-point resistance undulates between ~00 and 300Ω from 200 GHz to 1 THz—much higher than the 72Ω value from Booker's modified formula, but quite beneficial for coupling to high-impedance broadband devices
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Semenov, A. D., Richter, H., Hubers, H. - W., Gunther, B., Smirnov, A., Il'in, K. S., et al. (2007). Terahertz performance of integrated lens antennas with a hot-electron bolometer. IEEE Trans. Microw. Theory Techn., 55(2), 239–247.
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