| Records |
| Author |
Gerecht, E.; Musante, C.F.; Zhuang, Y.; Ji, M.; Yngvesson, K.S.; Goyette, T.; Waldman, J. |
| Title |
NbN hot electron bolometric mixer with intrinsic receiver noise temperature of less than five times the quantum noise limit |
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Conference Article |
| Year |
2000 |
Publication |
Proc. IMS |
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| Volume |
2 |
Issue  |
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Pages |
1007-1010 |
| Keywords |
HEB mixer |
| Abstract |
In recent years, improvements in device development and quasi-optical coupling techniques utilizing planar antennas have led to a significant achievement in low noise receivers for the edges of the submillimeter frequency regime. Hot electron bolometric (HEB) receivers made of thin superconducting films such as NbN have produced a viable option for instruments designed to measure the molecular spectra for astronomical applications as well as in remote sensing of the atmosphere in the THz regime. This paper describes an NbN HEB mixer with intrinsic DSB receiver noise temperature of at most five times the quantum noise limit at frequencies as high as 2.24 THz |
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477 |
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Saslaw, William C. |
| Title |
The distribution of the galaxies. Gravitational clustering in cosmology |
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Book Whole |
| Year |
2000 |
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Press syndicate of the University of Cambridge |
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astronomy |
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495 |
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Nagatsuma, T.; Hirata, A.; Royter, Y.; Shinagawa, M.; Furuta, T.; Ishibashi, T.; Ito, H. |
| Title |
A 120-GHz integrated photonic transmitter |
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Conference Article |
| Year |
2000 |
Publication |
Proc. International topical meeting on microwave photonics (MWP 2000) |
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Pages |
225 - 228 |
| Keywords |
THz, teraherts communications, terahertz communication channel, photodiode, transmitter |
| Abstract |
A photonics-based 120-GHz transmitter has been developed. A photodiode, a planar antenna and a silicon lens were integrated to form a compact millimeter-wave (MMW) emitter. The MMW signal emitted from the transmitter has been detected with a waveguide-mounted Schottky diode. The received power exceeded 100 μW, which is the highest value ever reported for photonic MMW transmitter at frequencies of >100 GHz |
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595 |
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ГОСТ 2.711-82. ЕСКД. Схема деления изделия на составные части |
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2000 |
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gost, detproj |
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859 |
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Khosropanah, P.; Merkel, H.; Yngvesson, S.; Adam, A.; Cherednichenko, S.; Kollberg, E. |
| Title |
A distributed device model for phonon-cooled HEB mixers predicting IV characteristics, gain, noise and IF bandwidth |
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Conference Article |
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2000 |
Publication |
Proc. 11th Int. Symp. Space Terahertz Technol. |
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Pages |
474-488 |
| Keywords |
HEB mixer numerical model, diffusion cooling channel, diffusion channel, distributed HEB model, distributed model |
| Abstract |
A distributed model for phonon-cooled superconductor hot electron bolometer (HEB) mixers is given, which is based on solving the one-dimensional heat balance equation for the electron temperature profile along the superconductor strip. In this model it is assumed that the LO power is absorbed uniformly along the bridge but the DC power absorption depends on the local resistivity and is thus not uniform. The electron temperature dependence of the resistivity is assumed to be continuous and has a Fermi form. These assumptions are used in setting up the non-linear heat balance equation, which is solved numerically for the electron temperature profile along the bolometer strip. Based on this profile the resistance of the device and the IV curves are calculated. The IV curves are in excellent agreement with measurement results. Using a small signal model the conversion gain of the mixer is obtained. The expressions for Johnson noise and thermal fluctuation noise are derived. The calculated results are in close agreement with measurements, provided that one of the parameters used is adjusted. |
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University of Michigan, Ann Arbor, MI USA |
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893 |
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