| Records |
Author  |
Kramer, B.; Chen, C-C.; Volakis, J.D. |
| Title |
The development of a mini-UWB antenna |
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Journal Article |
| Year |
2004 |
Publication |
Measurement and Techniques Association Symposium |
Abbreviated Journal |
AMTA |
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Issue |
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Pages |
6 |
| Keywords |
optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
| Abstract |
There is a great interest in the automotive and military sectors for small and broadband antennas that meet modern communication needs. These needs require ultra-wide bandwidth (>10:1) UWB antennas, such as the spiral antenna. However, the physical size at the low-frequency end typically becomes too large for practical applications. To reduce the size of the antenna, miniaturization techniques must be employed such as the use of high-contrast dielectric materials. Size reduction using high-contrast materials has been demonstrated for narrowband antennas, such as patch antennas, but not for broadband antennas to our knowledge. Therefore, the concept of miniaturizing a broadband spiral antenna using dielectric materials will be investigated experimentally and numerically.Issues that arise from dielectric loading such as impedance reduction will also be addressed. It will be shown using the results from these studies that there are practical limitations to the amount of miniaturization which can be achieved. |
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RPLAB @ gujma @ |
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751 |
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Koshelets, V. P.; Shitov, S. V.; Dmitriev, P. N., Ermakov, A. B.; Filippenko, L. V.; Koryukin, O.V.; Sobolev, A.S.; Torgashin, M.Yu.; Yagoubov, P.; Hoogeveen, R. |
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Integrated submillimeter and terahertz receivers with superconducting local oscillator |
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Abstract |
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2004 |
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Presanted at 8th International Workshop “From Andreev Reflection to the International Space Station” |
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513 |
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Koshelets, V. P.; Dmitriev, P. N.; Ermakov, A. B.; Filippenko, L. V.; Khudchenko, A. V.; Koryukin, O. V.; Torgashin, M. Yu.; Hoogeveen, R.; Vreeling, W. J.; Yagoubov, P. |
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SIR for TELIS (post-critical) review |
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Miscellaneous |
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2004 |
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516 |
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Koshelets, V. P. |
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Integrated superconducting submm receivers |
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Miscellaneous |
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2004 |
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511 |
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Korneev, A.; Kouminov, P.; Matvienko, V.; Chulkova, G.; Smirnov, K.; Voronov, B.; Gol'tsman, G. N.; Currie, M.; Lo, W.; Wilsher, K.; Zhang, J.; Słysz, W.; Pearlman, A.; Verevkin, A.; Sobolewski, Roman |
| Title |
Sensitivity and gigahertz counting performance of NbN superconducting single-photon detectors |
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Journal Article |
| Year |
2004 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
84 |
Issue |
26 |
Pages |
5338-5340 |
| Keywords |
SSPD, NEP, QE |
| Abstract |
We have measured the quantum efficiencysQEd, GHz counting rate, jitter, and noise-equivalentpowersNEPdof nanostructured NbN superconducting single-photon detectorssSSPDsdin thevisible to infrared radiation range. Our 3.5-nm-thick and 100- to 200-nm-wide meander-typedevices(total area 10310mm2), operating at 4.2 K, exhibit an experimental QE of up to 20% inthe visible range and,10% at 1.3 to 1.55mm wavelength and are potentially sensitive up tomidinfrareds,10mmdradiation. The SSPD counting rate was measured to be above 2 GHz withjitter,18 ps, independent of the wavelength. The devices’ NEP varies from,10−17W/Hz1/2for1.55mm photons to,10−20W/Hz1/2for visible radiation. Lowering the SSPD operatingtemperature to 2.3 K significantly enhanced its performance, by increasing the QE to,20% andlowering the NEP level to,3310−22W/Hz1/2, both measured at 1.26mm wavelength. |
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0003-6951 |
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532 |
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Klapwijk, T. M.; Barends, R.; Gao, J. R.; Hajenius, M.; Baselmans, J. J. A. |
| Title |
Improved superconducting hot-electron bolometer devices for the THz range |
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Conference Article |
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2004 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
| Volume |
5498 |
Issue |
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Pages |
129-139 |
| Keywords |
HEB mixer distributed model, numerical model |
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Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical conditions during the mixing process. We find that the mixing is predominantly due to the exponential rise of the local resistivity as a function of electron temperature. |
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Invited talk, Recommended by Klapwijk |
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912 |
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Klaassen, T. O.; Hovenier, J. N.; Adam, A. J. L.; Fischer, J.; Jakob, G.; Poglitsch, A.; Redlich, B. |
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Terahertz calorimetry for the Herschel Space Observatory |
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Conference Article |
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2004 |
Publication |
Proc. 29th IRMMW / 12th THz |
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815-816 |
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mirror, reflection index, emissivity, calorimetry, space observatory, terahertz, THz |
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578 |
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Kaurova, N. S.; Finkel, M. I.; Maslennikov, S. N.; Vahtomin, Yu. B.; Antipov, S. V.; Smirnov, K. V.; Voronov, B. M.; Gol'tsman, G. N.; Ilyin, K. S. |
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Submillimeter mixer based on YBa2Cu3O7-x thin film |
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Conference Article |
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2004 |
Publication |
Proc. 1-st conf. Fundamental problems of high temperature superconductivity |
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291 |
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HTS, HEB mixer |
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Moscow-Zvenigorod |
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Moscow-Zvenigorod |
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355 |
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Il'in, K.; Siegel, M.; Semenov, A.; Engel, A.; Hübers, H.-W.; Hollmann, E.; Gol'tsman, G.; Voronov, B. |
| Title |
Thickness dependence of superconducting properties of ultrathin Nb and NbN films |
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Conference Article |
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2004 |
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AKF-Frühjahrstagung |
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Nb, NbN films, has potential plagiarism |
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Berlin-Adlershof |
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1503 |
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Hubers, H.-W.; Semenov, A.; Richter, H.; Schwarz, M.; Gunther, B.; Smirnov, K.; Gol’tsman, G.; Voronov, B. |
| Title |
Heterodyne receiver for 3-5 THz with hot-electron bolometer mixer |
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Conference Article |
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2004 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
| Volume |
5498 |
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579-586 |
| Keywords |
NbN HEB mixers |
| Abstract |
Heterodyne receivers for applications in astronomy and planetary research need quantum limited sensitivity. In instruments which are currently build for SOFIA and Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. The local oscillator and the mixer are the most critical components for a heterodyne receiver operating at 3-5 THz. The design and performance of an optically pumped THz gas laser optimized for this frequency band will be presented. In order to optimize the performance for this frequency hot electron bolometer mixers with different in-plane dimensions and logarithmic-spiral feed antennas have been investigated. Their noise temperatures and beam patterns were measured. Above 3 THz the best performance was achieved with a superconducting bridge of 2.0 x 0.2 μm2 incorporated in a logarithmic spiral antenna. The DSB noise temperatures were 2700 K, 4700 K and 6400 K at 3.1 THz, 4.3 THz and 5.2 THz, respectively. The results demonstrate that the NbN HEB is very well suited as a mixer for THz heterodyne receivers up to at least 5 THz. |
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SPIE |
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Zmuidzinas, J.; Holland, W.S.; Withington, S. |
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Millimeter and Submillimeter Detectors for Astronomy II |
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1483 |
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