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TNO Defensie en Veiligheid (author), Janssen, J.P.B. (author), van Heijningen, M. (author), Visser, G.C. (author), Rodenburg, M. (author), Johnson, H.K. (author), Uren, M.J. (author), Morvan, E. (author), van Vliet, F.E. (author)
Gallium-Nitride technology is known for its high power density and power amplifier designs, but is also very well suited to realise robust receiver components. This paper presents the design, realisation and measurement of two robust AlGaN/GaN low noise amplifiers. The two versions have been designed in the Alcatel-Thales III-V lab AlGaN/GaN...
conference paper 2009
document
TNO Defensie en Veiligheid (author), van der Bent, G. (author), de Boer, T.S. (author), van Dijk, R. (author), van der Graaf, M.W. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
An X-band MMIC containing two 6 bit phase shifters and 1 Watt amplifiers in balanced configuration has been developed. The device has two output ports. The balance between the output powers of the two ports can be controlled via de phase shifter settings. This MMIC could be applied in systems where variable linear polarisation control is...
conference paper 2009
document
TNO Defensie en Veiligheid (author), van Wanum, M. (author), Lebouille, T.T.N. (author), Visser, G.C. (author), van Vliet, F.E. (author)
In this article diodes from three different semiconductor technologies are compared based on their suitability to protect a receiver. The semiconductor materials involved are Silicon, Gallium Arsenide and Gallium Nitride. The diodes in the diverse semiconductor technologies themselves are close in performance, but the possibility to integrate...
conference paper 2009
document
TNO Defensie en Veiligheid (author), Cavallo, D. (author), Neto, A. (author), Gerini, G. (author)
A prototype array of dual polarized connected dipoles has been manufactured. The feed structure is composed by two orthogonal 8x8 elements for each polarization (128). The operational frequency ranges from 6 to 9 GHz (40% relative bandwidth). Preliminary measurements highlighted the presence of unpredicted common-mode resonances excited in the...
conference paper 2009
document
TNO Defensie en Veiligheid (author), van Wanum, M. (author), van Dijk, R. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
A broadband class E High Power Amplifier (HPA) is presented. This HPA is designed to operate at S-band (2.75 to 3.75 GHz). A power added efficiency of 50% is obtained for the two stage amplifier with an output power of 35.5 dBm on a chip area of 5.25 × 2.8 mm2.
conference paper 2009
document
TNO Defensie en Veiligheid (author), van der Bent, G. (author), de Boer, T.S. (author), van Dijk, R. (author), van der Graaf, M.W. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
An X-band MMIC containing two 6 bit phase shifters and 1 Watt amplifiers in balanced configuration has been developed. The device has two output ports. The balance between the output powers of the two ports can be controlled via de phase shifter settings. This MMIC could be applied in systems where variable linear polarisation control is...
conference paper 2009
document
TNO Defensie en Veiligheid (author), van Dijk, R. (author), van der Houwen, E.H. (author), Maas, A.P.M. (author)
A phased-array FMCW radar has been design and built from COTS components. The generation of the frequency sweep is done by mixing a central local oscillator signal with a baseband sweep of a direct digital synthesizer (DDS). To ensure maximum flexibility the receive side has been equipped with it's own swept signal. The transmit frequency...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Ettorre, M. (author), Neto, A. (author), Gerini, G. (author), Maci, S. (author)
This work proposes a leaky-wave slot array antenna fed by a dual offset Gregorian reflector system realized by pins in a parallel plate waveguide. The radiating part of the antenna is composed by parallel slots etched on one side of the same parallel plate waveguide. The dual offset Gregorian reflector system is fed by an arrangement constituted...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Kester, L.J.H.M. (author)
Advances in network technologies enable distributed systems, operating in complex physical environments, to coordinate their activities over larger areas within shorter time intervals. Some envisioned application domains for such systems are defence, crisis management, traffic management and public safety. In these systems humans and machines...
conference paper 2008
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TNO Defensie en Veiligheid (author), Baselmans, J.J.A. (author), Yates, S. (author), Neto, A. (author), Bekers, D. (author), Gerini, G. (author), Baryshev, A. (author), Lankwarden, Y.J.Y. (author), Hoevers, H. (author)
We have designed a novel sub-mm radiation detector based upon a twin slot antenna placed in the focus of a Si elliptical lens. We use a novel Electromagnetic Band Gap (EBG) super-layer, consisting of 2 1/4 gamma dielectric layers of Si (ε=11.7) and SiO2 (ε=4) and a Si carrier wafer to enhance the directivity of the feed. The antenna is coupled...
conference paper 2008
document
TNO Defensie en Veiligheid (author), Maas, A.P.M. (author), Janssen, J.P.B. (author), van Vliet, F.E. (author)
A set of X-band absorptive limiter GaAs MMICs has been designed and realised using both the PPH25x foundry process from UMS and the PP50-10 process from WIN semiconductors. The innovative limiter concepts have been extensively characterised by both pulsed and CW measurements. Both passive and active topologies have been implemented. The passive...
conference paper 2007
document
TNO Defensie en Veiligheid (author), Hoogeboom, P. (author), Buvry, S. (author), Loehner, A. (author)
In view of the NATO Air-to-Ground Surveillance requirement and the results of the 2004 Feasibility Study on the development of an advanced SAR/MTI radar system, the TCAR industries, represented by a group of industries from 6 nations (FR, GE, IT, NL, SP, USA), have been tasked by the NATO AGS Prime Contractor to conduct a 6-month Risk Reduction...
conference paper 2007
document
TNO Defensie en Veiligheid (author), Bruni, S. (author), Neto, A. (author), Gerini, G. (author), Bekers, D.J. (author)
This paper proposes a novel imaging architecture suited for use in the mm and the sub-mm wave regimes. The structure is composed by a one dimensional array of radiators in order to enhance the image acquisition time with respect to single element detection. Moreover each of the antenna elements composing the array is characterized by a...
conference paper 2007
document
TNO Defensie en Veiligheid (author), van der Bent, G. (author), van der Graaf, M.W. (author), van Vliet, F.E. (author)
An X-band Phase Shifting Power Amplifier with sixbit phase control and 5 Watt output power has been developed and tested. The aim of the development is cost reduction for Transmit and Receive components for phased array systems. The device has been developed in the 6-inch 0.5 um power pHEMT process (PP50-11) of WIN Semiconductors. The use of...
conference paper 2007
document
TNO Defensie en Veiligheid (author), van der Bent, G. (author), van Wanum, M. (author), de Hek, A.P. (author), van der Graaf, M.W. (author), van Vliet, F.E. (author)
A protection circuit is developed which protects transistors in the output stage of a High Power Amplifier against voltage breakdown as a result of mismatch. The circuit is applied in an S-band and X-band High Power Amplifier and measured under various mismatch conditions. The devices have been developed in the 6-inch 0.5 um GaAs power pHEMT...
conference paper 2007
document
TNO Defensie en Veiligheid (author), Barrenechea, P. (author), Elferink, F.H. (author), Janssen, J.A.A.J. (author)
The use of amplitude modulation to encode information onto an FMCW radar signal is proposed in this paper. This new technique, that has been named AM-FMCW communicating radar, provides a new channel for broadband communication by reusing the radar frequencies and without introducing any distortion in the radar functionality
conference paper 2007
document
TNO Defensie en Veiligheid (author), van Vliet, F.E. (author)
Wideband phased-array front-end technology is characterised by stringent specifications, increasing costpressure and is subject to fundamental changes. This paper addresses trends observed for these systems, both in relation to the functionality required (including the architecture of the system and the platforms upon which they are applied) as...
conference paper 2007
document
TNO Defensie en Veiligheid (author), Hoogeboom, P. (author), Buvry, S. (author), Loehner, A. (author)
In view of the NATO Air-to-Ground Surveillance requirement and the results of the 2004 Feasibility Study on the development of an advanced SAR/MTI radar system, the TCAR industries, represented by a group of industries from 6 nations (FR, GE, IT, NL, SP, USA), have been tasked by the NATO AGS Prime Contractor to conduct a 6-month Risk Reduction...
conference paper 2007
document
TNO Defensie en Veiligheid (author), de Wit, J.J.M. (author), van Rossum, W.L. (author), Otten, M.P.G. (author)
Phased array antennas are increasingly used in modern radar systems. Such systems are very liable to distortion of the relative phases between the radiating elements. For airborne, spaceborne, and naval phased array systems, vibrations of the array structure are an important source of phase distortions. In this paper, a system concept will be...
conference paper 2007
document
TNO Defensie en Veiligheid (author), Huizing, A.G. (author), Lievers, C.M. (author), van Rossum, W.L. (author), Maas, A.P.M. (author)
This paper describes an active electronically scanned array (AESA) FMCW radar with eight transceivers. Each transceiver has its own Direct Digital Synthesizer (DDS) for signal generation which enables digital beam forming on transmit as well as on receive. The coherent operation of the eight transceivers and the capability to perform digital...
conference paper 2007
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