Results 121 to 130 of about 36,878 (167)

Ka-band scintillations: measurements and model predictions

Proceedings of the IEEE, 1997
New propagation data from a 30/20-GHz propagation experiment at several US sites, including Fairbanks, AK, and Norman, OK, are presented to examine existing models for scintillations. Beacon measurements were collected at one sample per second continuously and at 20 samples per second for selected intervals. The widely separated measurement frequencies
Charles E. Mayer, Bradley E. Jaeger, Robert K. Crane, Xuhe Wang   +3 more
openaire   +1 more source

Ka-band SATCOM in A2C2S

IEEE MILCOM 2004. Military Communications Conference, 2004., 2005
The rapid growth of the digitized battlefield is placing greater demands on spectrum use. High bandwidth/data rate requirements and non-line-of-sight communication links move one toward the use of high frequency and high bandwidth satellite communications.
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Radar Reflectivity Measurements Of Ice at Ka Band

IEEE Antennas and Propagation Magazine, 2011
Naval and helicopter radars may face operational scenarios where radar returns from the surface of ice become valuable. Partly due to that, we have measured the radar reflectivity of sea ice at Ka band for very small grazing angles. For an angle of 0.7°, an effective reflectivity of -26 dBsm ± 2 dB was observed with horizontal polarization.
Ruoskanen, Jukka, Peltonen, Jouni, Eskelinen, Pekka   +3 more
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A Ka-Band Electronically Tunable Ferroelectric Filter

IEEE Microwave and Wireless Components Letters, 2009
This letter presents a three-pole tunable Ka-band coplanar filter that includes six high-Q BST ferroelectric capacitors. It tunes from 29 GHz up to 34 GHz (17%) with low bias voltages ranging from 0 V to 30 V. The filter has fractional bandwidths of 9.5-12.2%.
Courrèges, Stanis, Li, Y., Zhao, Z., Choi, K., Hunt, A., Horst, S., Cressler, J.D., Papapolymerou, J.   +7 more
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Ka band power amplifiers

IEE Seminar Microwave and RF Power Amplifiers, 2000
The design and measured results of a Ka-Band (26-40 GHz band) power amplifiers (PA) are introduced and discussed. Ka-band PAs are intended for military purposes. With PAs frequently being the primary focus in a communication system, Ka-band power amplifier applications will become more prominent in the near future. (6 pages)
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A Ka-Band GaAs Monolithic Phase Shifter

IEEE Transactions on Microwave Theory and Techniques, 1983
The design and performance of a GaAs monolithic 1800 one-bit switched line phase shifter test circuit for Ka-band operation is presented. A self-aligned gate (SAG) fabrication technique is also described that reduces resistive parasitic in the switching FET's.
V. Sokolov, J.J. Geddes, A. Contolatis, P.E. Bauhahn, null Chente Chao   +4 more
openaire   +1 more source

A miniaturised frontend for Ka-band radar applications

2005 European Microwave Conference, 2005
This paper presents a four quadrants monopulse frontend including a waveguide slot array antenna. The frontend has an extreme high level of integration due to the use of modern multilayer technologies. The applications for such frontends are imaging systems and military seekerheads operating in Ka-band. The size of the realised frontend is less than 80
A. Brokmeier, T. Geist, B. Zimmermann, R. Mack   +3 more
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Interoperability challenges for Ka‐band satellite systems

Space Communications, 2002
For Ka‐band satellite systems to compete successfully in the broadband marketplace, two fundamental challenges must be addressed: cost, and the quality and performance of the offered services/applications. Specific issues related to these challenges are discussed and a set of solutions is proposed.
Prakash Chitre, Thomas Inukai
openaire   +2 more sources

Global mapping of attenuation at ku- and ka-band

IEEE Transactions on Geoscience and Remote Sensing, 2003
The propagation of radio waves for Earth-space slant path at C-band and higher frequencies is dominated by precipitation in the atmosphere. At a given frequency, attenuation depends on the length of the radio path, the size distribution, and the phase state of the hydrometeor profile. Using the observations from the Tropical Rainfall Measuring Mission (
V. Chandrasekar 0001, Hiroki Fukatsu, Khalid Mubarak   +2 more
openaire   +1 more source

Ka-Band Monolithic GaAs Balanced Mixers

Microwave and Millimeter-Wave Monolithic Circuits, 1983
Monolithic integrated circuits have been developed on semi-insulating GaAs substrates for millimeter-wave balanced mixers. The GaAs chip is used as a suspended stripline in a cross-bar mixer circuit. A double sideband noise figure of 4.5 dB has been achieved with a monolithic GaAs balanced mixer filter chip over a 30- to 32-GHz frequency range.
C. Chao, A. Contolatis, S.A. Jamison, P.E. Bauhahn   +3 more
openaire   +1 more source