Results 221 to 230 of about 748,493 (246)
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L-band epitaxial Gunn oscillators
Proceedings of the IEEE, 1967Gunn oscillators have been made from epitaxially grown GaAs n+-n-n+"sandwich" structures. Peak powers up to 56 watts have been obtained in L-band with an efficiency of 15 percent. The positive temperature coefficient of resistance of the epitaxial material provides a built-in protection against thermal runaway.
B.E. Berson, S.Y. Narayan
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AN L-BAND TUNNEL DIODE OSCILLATOR (INCLUDING L-BAND TRANSISTOR OSCILLATOR-MULTIPLIERS).
1964Abstract : Gallium-Arsenide tunnel diodes having 600 ma peak current and resistive cutoff frequencies of 6 to 10 Gc were developed. The diodes were fabricated in a low inductance package permitting operation at L-band at power outputs up to 30 mw. Low impedance oscillator circuits were designed which gave power outputs of 20 to 30 mw over the required ...
E. T. Casterline, R. Gold, D. E. Nelson
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Elbaraii, L-Band Radiometer System
IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium, 2008L-band (1-2 GHz) microwave radiometry is an important remote sensing technique to monitor soil moisture over land surfaces at the global scale. The ESA L-Band SMOS radiometer mission aims at providing as global maps of soil moisture, with accuracy better than 0.04 m3m-3 every 3 days, with a spatial resolution better than 50 km.
Andreas Wiesmann +5 more
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2012 International Conference on Computational Problem-Solving (ICCP), 2012
low noise amplifiers are the key components of the receiver front end, it has been widely used in microwave communication, radar, electronic warfare, and a variety of high-precision microwave measurement system and its performance directly affects the performance of entire receiving system, so it is essential to develop excellent low noise amplifier ...
null Junlin Song, null Haoquan Hu
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low noise amplifiers are the key components of the receiver front end, it has been widely used in microwave communication, radar, electronic warfare, and a variety of high-precision microwave measurement system and its performance directly affects the performance of entire receiving system, so it is essential to develop excellent low noise amplifier ...
null Junlin Song, null Haoquan Hu
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NASA's L-Band Imaging Scatterometer
IGARSS 2004. 2004 IEEE International Geoscience and Remote Sensing Symposium, 2004The L-Band Imaging Scatterometer (LIS) is an airborne radar developed at NASA Goddard Space Flight Center which combines electronic beam steering and digital beamforming allowing the implementation of different scanning techniques. The LIS efforts are part of the RadSTAR initiative intended to develop the technology that will enable a combined radar ...
R.F. Rincon +3 more
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8th European Microwave Conference, 1978, 1978
Low noise GaAs FET amplifier performance is enhanced at 1-2 GHz frequencies through the use of source inductance feedback. A simple circuit model predicts noise and signal performance and is used to derive matching circuits for the amplifier design. A 1-2 GHz single stage amplifier, designed on the basis of the modeled results, demonstrates
L. Nevin, R. Wong
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Low noise GaAs FET amplifier performance is enhanced at 1-2 GHz frequencies through the use of source inductance feedback. A simple circuit model predicts noise and signal performance and is used to derive matching circuits for the amplifier design. A 1-2 GHz single stage amplifier, designed on the basis of the modeled results, demonstrates
L. Nevin, R. Wong
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Fast Ferroelectric L-band Tuner
AIP Conference Proceedings, 2006Description is given of a preliminary conceptual design for a tuner that employs a new ferroelectric ceramic that allows fast changes in coupling between the SRF acceleration structure of a linac and the external RF feeding line. The switching time of this device is in the range of a few microseconds.
S. Yu. Kazakov +4 more
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NASA's L-band imaging scatterometer
SPIE Proceedings, 2006The NASA RADSTAR instrument is a compact scatterometer-radiometer system designed for airborne and space remote sensing of Earth surface properties such as soil moisture and sea surface salinity. In this paper we describe the active portion of RADSTAR, the L-band Imaging Scatterometer (LIS).
Peter Hildebrand +2 more
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2008 18th International Crimean Conference - Microwave & Telecommunication Technology, 2008
MMIC amplifier development results have been presented. The amplifier chip with dimensions of 2.0 times 1.8 mm2 has been made to provide gain about 6 dB and VSWR 1.6.
S. V. Bezus +5 more
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MMIC amplifier development results have been presented. The amplifier chip with dimensions of 2.0 times 1.8 mm2 has been made to provide gain about 6 dB and VSWR 1.6.
S. V. Bezus +5 more
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Present and Future of L-Band Radiometry
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018After almost 9 years in orbit L band satellite radiometry has demonstrated its impacts and values for a wide range of science and applications. In some cases it has demonstrated its uniqueness for assessing key environmental variables and in many others its high impact.
Kerr, Yann H. +10 more
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