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Martin슠Harwit |
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The Herschel mission |
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2004 |
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Advances in Space Research |
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34 |
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3 |
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568-572 |
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RPLAB @ s @ herschel_mission |
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375 |
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Moore, D.P.; Remedios, J. J.; Waterfall, A. M.; Burgess, A. |
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Measuring halocarbons from the MIPAS instrument |
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Miscellaneous |
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2004 |
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Poster |
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RPLAB @ s @ |
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441 |
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Author |
González, Francisco Javier; Alda, Javier; Ilic, Bojan; Boreman, Glenn D. |
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Title |
Infrared Antennas Coupled to Lithographic Fresnel Zone Plate Lenses |
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Journal Article |
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2004 |
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Applied Optics |
Abbreviated Journal |
Appl. Opt. |
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43 |
Issue |
33 |
Pages |
6067-6073 |
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Keywords |
optical antennas |
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Several designs for Fresnel zone plate lenses (FZPLs) to be used in conjunction with antenna-coupled infrared detectors have been fabricated and tested. The designs comprise square and circular FZPLs with different numbers of Fresnel zones working in transmissive or reflective modes designed to focus infrared energy on a square-spiral antenna connected to a microbolometer. A 163× maximum increase in response was obtained from a 15-zone circular FZPL in the transmissive mode. Sensor measurements of normalized detectivity D* resulted in a 2.67× increase with FZPLs compared with measurements made of square-spiral antennas without FZPLs. The experimental results are discussed and compared with values obtained from theoretical calculations. |
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RPLAB @ gujma @ |
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740 |
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Kramer, B.; Chen, C-C.; Volakis, J.D. |
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The development of a mini-UWB antenna |
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Journal Article |
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2004 |
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Measurement and Techniques Association Symposium |
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AMTA |
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6 |
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optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
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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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Boogaard, G.R.; Verbruggen, A.H.; Belzig, W.; Klapwijk T.M. |
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Resistance of superconducting nanowires connected to normal-metal leads |
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2004 |
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Phys. Rev. B |
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Phys. Rev. B |
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69 |
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220503(R)(1-4) |
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We study experimentally the low temperature resistance of superconducting nanowires connected to normal metal reservoirs. Wefind that a substantial fraction of the nanowires is resistive, down to the lowest tempera-ture measured, indicative of an intrinsic boundary resistance due to the Andreev-conversion of normal current to supercurrent. The results are successfully analyzed in terms of the kinetic equations for diffusive superconductors. |
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RPLAB @ atomics90 @ |
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960 |
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