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Brown, E. R.; Lee, A. W. M.; Navi, B. S.; Bjarnason, J. E. |
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Characterization of a planar self-complementary square-spiral antenna in the THz region |
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Journal Article |
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2006 |
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Microwave and Optical Technology Letters |
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Microwave Opt Technol Lett |
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48 |
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3 |
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524-529 |
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optical antennas; square spiral antenna; self complementary THz; photomixing; lens; method of moments; geometric optics; physical optics |
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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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RPLAB @ gujma @ |
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736 |
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McDonald, P.C.; Jaramillo, E.; Baudouy, B. |
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Thermal design of the CFRP support struts for the spatial framework of the Herschel Space Observatory |
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2006 |
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Cryogenics |
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Cryogenics |
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46 |
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4 |
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298-304 |
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0011-2275 |
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RPLAB @ s @ |
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442 |
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Yang, Z. Q.; Hajenius, M.; Baselmans, J. J. A.; Gao, J. R.; Voronov, B.; Gol’tsman, G. N. |
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Title |
Reduced noise in NbN hot-electron bolometer mixers by annealing |
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Journal Article |
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2006 |
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Supercond. Sci. Technol. |
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Supercond. Sci. Technol. |
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19 |
Issue |
4 |
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L (9 to 12) |
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NbN HEB mixers |
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We find that the sensitivity of heterodyne receivers based on superconducting hot-electron bolometers (HEBs) increases by 25–30% after annealing at 85 °C in vacuum. The devices studied are twin-slot antenna coupled mixers with a small NbN bridge of 1 × 0.15 µm2. We show that annealing changes the device properties as reflected in sharper resistive transitions of the complete device, apparently reducing the device-related noise. The lowest receiver noise temperature of 700 K is measured at a local oscillator frequency of 1.63 THz and a bath temperature of 4.3 K. |
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0953-2048 |
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1456 |
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Koshelets, V. P.; Khudchenko, A. V. |
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Analysis of spectral characteristics of a superconducting integrated receiver |
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2006 |
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J. Communications Technol. Electron. |
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51 |
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5 |
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596-603 |
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RPLAB @ s @ mix_SIR |
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400 |
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Koshelets, V. P.; Khudchenko, A. V. |
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Analysis of spectral characteristics of a superconducting integrated receiver |
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2006 |
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J. Communications Technol. Electron. |
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51 |
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5 |
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596-603 |
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SIR |
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1064-2269 |
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526 |
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