Searched for: mods_originInfo_publisher_s:"Eurpean%5C+Microwave%5C+Association%5C+EuMA"
(1 - 20 of 20)
document
van Dijk, R. (author), Neto, A. (author), Akkermans, J.A.G. (author), Mills, J. (author), TNO Defensie en Veiligheid (author)
At most frequencies currently in use for short range data communication the available bandwidth is limiting the data rate. However, around 60 GHz there is an unlicensed frequency band with ample bandwidth appointed to support high data rate communication. Moreover, semiconductor technology for this frequency range is maturing and price levels...
conference paper 2008
document
Suijker, E.M. (author), Sudow, M. (author), Fagerlind, M. (author), de Hek, A.P. (author), van Vliet, F.E. (author), Rorsman, N. (author), TNO Defensie en Veiligheid (author)
The development of two GaN MMIC power amplifiers is reported. The amplifiers are processed in the AlGaN/GaN technology of Chalmers University of Technology using 0.25 μm HEMTs. The S-band amplifier operates at frequencies from 3 to 4 GHz and has a maximum output power of 5.6 W with an associated efficiency of 28 %. The X-band amplifier has a...
conference paper 2008
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Sy, O.O. (author), Vaessen, J.A.H.M. (author), van Beurden, M.C. (author), Michielsen, B.L. (author), Tijhuis, A.G. (author), Zwamborn, A.P.M. (author), Groot, J.S. (author), TNO Defensie en Veiligheid (author)
A modeling method is proposed to quantify uncertainties affecting electromagnetic interactions. This method considers the uncertainties as random and measures them thanks to probability theory. A practical application is considered through the case of a transmission-line of varying geometry, illuminated by a fixed electromagnetic field. The...
conference paper 2008
document
van Halsema, D. (author), de Jongh, R.V. (author), van Es, J. (author), Otten, M.P.G. (author), Vermeulen, B.C.B. (author), van Liempt, L.J. (author), TNO Defensie en Veiligheid (author)
Modern airborne ground surveillance radar systems are increasingly based on Active Electronically Scanned Array (AESA) antennas. Efficient use of array technology and the need for radar solutions for various airborne platforms, manned and unmanned, leads to the design of scalable radar systems. The design and realisation of such a system is...
conference paper 2008
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Pasian, M. (author), Neto, A. (author), Monni, S. (author), Ettorre, M. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
This paper deals with the use of Frequency Selective Surfaces (FSS) to increase the Efficiency × Bandwidth product in Ultra-Wide Band (UWB) antenna arrays whose efficiency is limited by the front-to-back ratio. If the backing reflector is realized in one metal plane solution its location will be suitable as antenna ground plane only on a limited...
conference paper 2008
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do Nascimento, J.R.V. (author), Nikookar, H. (author), TNO Informatie- en Communicatietechnologie (author)
In this paper, the achievable range-bit rate performance is evaluated for Time-Hopping (TH) UWB networks complying with the FCC outdoor emission limits in the presence of Multiple Access Interference (MAI). Application of TH-UWB range-bit rate performance is presented for UWB sensor networks. Results show that UWB radio technology is suitable to...
conference paper 2008
document
Bolt, R.J. (author), Bruni, S. (author), Neto, A. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
This contribution describes the design and characterization of a very compact 8-element proximity fed cavity antenna array realized completely in PCB technology. The cavities are formed by the placement of a series of through pins (vias) along a rectangular outline. Micro-strip lines excite the structure, and slot coupling is used to feed the...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Maas, A.P.M. (author), van Vliet, F.E. (author)
This paper describes the design and performance of a low-cost synthesized FMCW radar module, operating in S band. The bi-layer PCB contains a frequency-agile low phase-noise synthesizer and three identical coherent receive-channels. The transmit channel has an automatic power control system that reduces the output power when a large reflection...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Neto, A. (author), Ettorre, M. (author), Gerini, G. (author), de Maagt, P.J. (author)
This work is the fourth of a series on the use of super-layers to shape the radiation pattern of each of the feeds composing a focal plane imaging array. Using dielectric or Frequency Selective Surface type of super-layers the spill over from the reflectors is reduced without increasing the dimensions of each aperture. This effect is achieved...
conference paper 2008
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TNO Defensie en Veiligheid (author), Coenen, T.J. (author), Bekers, D.J. (author), Tauritz, J.L. (author), van Vliet, F.E. (author)
In the last decade, post-wall waveguides have emerged as an interesting building block for (antenna) feed networks because of their potential low losses, low costs, ease of manufacturing and integrability with existing printed circuit board techniques. In this paper we present a general formulation to analyze the characteristics of post-wall...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Angenoorth, P. (author), Chabod, L. (author), Hoogeboom, P. (author)
The SOSTAR-X European program started in 2001 and ended in 2007 with successful in-flight tests and operational demonstration. This demonstrator was funded under a R&D contract based on a governmental MoU between France, Germany, Italy, Spain and The Netherlands. This document presents the scope, content and main results achieved by SOSTAR-X...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Angenoorth, P. (author), Chabod, L. (author), Hoogeboom, P. (author)
The SOSTAR-X European program started in 2001 and ended in 2007 with successful in-flight tests and operational demonstration. This demonstrator was funded under a R&D contract based on a governmental MoU between France, Germany, Italy, Spain and The Netherlands. This document presents the scope, content and main results achieved by SOSTAR-X...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Otten, M.P.G. (author), de Koster, E. (author), Groot, J.S. (author), de Jong, A.J. (author), van den Akker, M. (author), Vriend, P. (author)
The SOSTAR-X project has developed a demonstrator dedicated to the surveillance of both fixed and moving targets on large coverage areas, target activity analysis on dedicated areas and classification on designated targets. In this project, The Netherlands contribution has been in the areas of Spectral Classification (SPC mode), SAR SPOT mode...
conference paper 2008
document
TNO Defensie en Veiligheid (author), van Heijningen, M. (author), Visser, G.C. (author), Wuerfl, J. (author), van Vliet, F.E. (author)
This paper presents the design of an S-band HPA MMIC in AlGaN/GaN CPW technology for radar TR-module application. The trade-offs of using an MMIC solution versus discrete power devices are discussed. The MMIC shows a maximum output power of 38 Watt at 37% Power Added Efficiency at 3.1 GHz. An output power of more than 20 Watt has been simulated...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Neto, A. (author), Cavallo, D. (author), Gerini, G. (author), Toso, G. (author), van Vliet, F.E. (author)
In this paper the impedances of connected arrays of slots and dipoles are presented. The study is based on the rigorous Green’s Functions (GF) of the two structures in infinite array environments. The preliminary investigations indicates that the potentials of the connected slots when scanning are limited, due to the excitation of a leaky wave...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Otten, M.P.G. (author), de Koster, E. (author), Groot, J.S. (author), de Jong, A.J. (author), van den Akker, M. (author), Vriend, P. (author)
The SOSTAR-X project has developed a demonstrator dedicated to the surveillance of both fixed and moving targets on large coverage areas, target activity analysis on dedicated areas and classification on designated targets. In this project, The Netherlands contribution has been in the areas of Spectral Classification (SPC mode), SAR SPOT mode...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Otten, M.P.G. (author), Vermeulen, B.C.B. (author), van Liempt, L.J. (author), van Halsema, D. (author), de Jongh, R.V. (author), van Es, J. (author)
Modern airborne ground surveillance radar systems are increasingly based on Active Electronically Scanned Array (AESA) antennas. Efficient use of array technology and the need for radar solutions for various airborne platforms, manned and unmanned, leads to the design of scalable radar systems. The design and realisation of such a system is...
conference paper 2008
document
TNO Defensie en Veiligheid (author), de Hek, A.P. (author), Rodenburg, M. (author), van Vliet, F.E. (author)
This paper discusses the design and performance of a four port S-band multi-function MMIC. The multi-function chip consist of a 6-bit phase shifter, 6-bit attenuator, transmit receive switches, a low noise amplifier, a medium power amplifier and integrated LVCMOS control logic. It is shown that excellent results have been obtained for the...
conference paper 2008
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TNO Defensie en Veiligheid (author), Smits, F.M.A. (author), Huizing, A.G. (author), van Rossum, W.L. (author), Hiemstra, P. (author)
conference paper 2008
document
TNO Defensie en Veiligheid (author), Akkermans, J.A.G. (author), van Dijk, R. (author), Herben, M.H.A.J. (author)
A novel approach is presented to accurately measure the scattering parameters as well as the radiation pattern of planar antennas that operate in the millimeter-wave frequency band. To avoid interconnection problems, RF probes have been used to connect to the antenna. These RF probes are normally used for the characterisation of devices on a...
conference paper 2007
Searched for: mods_originInfo_publisher_s:"Eurpean%5C+Microwave%5C+Association%5C+EuMA"
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