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van Zeijl, E. (author), Schmits, R. (author), van den Berg, J.H. (author), Harmsma, P.J. (author), Westerveld, W.J. (author), Lagioia, M. (author), Bodis, P. (author), Ebeling, R.P. (author), Nieuwland, R.A. (author), Yang, S. (author), Lo Cascio, D.M.R. (author), Agovic, K. (author), Enderink, E.J. (author), van Vliet, R.E. (author), Yousefi, M. (author), TNO Industrie en Techniek (author)
conference paper 2010
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Westerveld, W.J. (author), Harmsma, P.J. (author), Schmits, R. (author), Lo Cascio, D.M.R. (author), Duisterwinkel, A.E. (author), Agovic, K. (author), van Vliet, R.E. (author), Urbach, H.P. (author), Yousefi, M. (author), TNO Industrie en Techniek (author)
conference paper 2010
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Dijk, R. (author), van Vliet, F.E. (author), Stefania, M. (author)
The invention relates to an electromagnetic limiter. The limiter comprises a multilayer having an electrically conducting pattern superposed on a dielectric structure. Further, the multilayer is provided with at least one electromagnetically transparent aperture for forming a frequency selective surface. In addition, the limiter comprises a non...
patent 2011
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de Boer, A. (author), Rodenburg, M. (author), van Dijk, R. (author), van Vliet, F.E. (author), Geurts, M. (author)
An 8 - 10 GHz linearised single-sideband Gilbert upconversion mixer is demonstrated in silicon BiCMOS technology. The QuBiC4X 0.25 μm BiCMOS process of NXP has been used. The device has an integrated local oscillator driver with polyphase quadrature generation. The IF chain uses feedback, selectable gain settings and DC offset circuitry to be...
conference paper 2011
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Soer, M.C.M. (author), Klumperink, E.A.M. (author), Nauta, B. (author), van Vliet, F.E. (author)
Phased-array receivers provide two major benefits over single-antenna receivers [1]. Their signal-to-noise ratio (SNR) doubles for each doubling in the number of elements, resulting in extended range. Secondly, interferers can be rejected in the spatial domain for increased link robustness. These arrays can be implemented by phase shifting and...
conference paper 2011
document
García, A. (author), Schlangen, E. (author), van de Ven, M. (author), van Vliet, D. (author)
It is well known that the healing rates of asphalt courses increase with the temperature. A new method, induction heating, is used in this paper to increase the lifetime of asphalt concrete pavements. Mastic will be first made electrically conductive by the addition of conductive fibers. Then it will be heated via induction energy. This will...
article 2011
document
García, Á. (author), Schlangen, E. (author), van de Ven, M. (author), van Vliet, D. (author)
The objective of this research is to examine the induction heating of mastic through the addition of electrically conductive fillers and fibers (graphite and steel wool), and to prove that this material can be healed with induction energy. The effect of fibers content, sand-bitumen ratio and the combination of fillers and fibers on the induction...
article 2011
document
de Heij, W. (author), de Boer, A. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
A Silicon-Germanium single chip receiver has been developed for S-band phased array radars with 2-D digital beamforming. The complete receiver chain from the S-band RF input up to the low-IF output has been integrated on a single SiGe chip. The only external components required to complete the receiver are an RF limiter for protection against...
conference paper 2011
document
de Boer, A. (author), Rodenburg, M. (author), van Dijk, R. (author), van Vliet, F.E. (author), Geurts, M. (author)
An 8 - 10 GHz linearised single-sideband Gilbert upconversion mixer is demonstrated in silicon BiCMOS technology. The QuBiC4X 0.25 μm BiCMOS process of NXP has been used. The device has an integrated local oscillator driver with polyphase quadrature generation. The IF chain uses feedback, selectable gain settings and DC offset circuitry to be...
conference paper 2011
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Alić, L. (author), van Vliet, M. (author), van Dijke, C.F. (author), Eggermont, A.M.M. (author), Veenland, J.F. (author), Niessen, W.J. (author)
This study aims to quantify the heterogeneity of tumour enhancement in dynamic contrast-enhanced MRI (DCE-MRI) using texture analysis methods. The suitability of the coherence and the fractal dimension to monitor tumour response was evaluated in 18 patients with limb sarcomas imaged by DCE-MRI pre- and post-treatment. According to the...
article 2011
document
van Vliet, F.E. (author), van Dijk, R. (author)
The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...
patent 2011
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van Vliet, F.E. (author), van Dijk, R. (author)
The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...
patent 2011
document
Garakoui, S.K. (author), Klumperink, E.A.M. (author), Nauta, B. (author), van Vliet, F.E. (author)
Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction (“beam squinting”). This paper quantifies beam squinting for a linear one-dimensional phased array with equally...
conference paper 2011
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Grooters, R. (author), Heijningen, M. (author), van Vliet, F.E. (author)
TNO has a long history in design and development of dedicated RF MMICs to be used in all kind of applications and for different popular frequency bands, especially related to RADAR applications. These designs make use of the leading available MMIC processes, and commercialisation of some of these products is realized by introducing them as part...
conference paper 2011
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Coenen, T.J. (author), Bekers, D.J. (author), Tauritz, J.L. (author), van Vliet, F.E. (author)
Waveguide structure integration in planar substrates for use in microwave components has received considerable attention in recent years. Waveguides with side walls consisting of cylindrical posts (postwall waveguides or PWWGs) are of interest, since they are compatible with standard PCB fabrication technology and exhibit low loss. In this paper...
article 2011
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van Vliet, F.E. (author), Klumperink, E.A.M. (author), Soer, M.C.M. (author), Garakoui, S.K. (author), de Boer, A. (author), de Hek, A.P. (author), de Heij, W. (author), Nauta, B. (author)
Phased-Arrays are increasingly used, and require Silicon implementations to result in affordable multi-beam systems. In this paper, CMOS implementations of two novel analogue beamforming multi-channel receivers will be presented. A narrow-band highly linear system exploiting switches and capacitors in advanced CMOS is presented, implementing a...
conference paper 2012
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Erkens, S. (author), van Vliet, D. (author), van Dommelen, A. (author), Leegwater, G.A. (author)
Most design methods for pavements use a factor explaining the difference between pavement life predictions from design models and performance in the road [1]. Part of this correction factor is healing, the natural capacity of asphalt concrete to recover in rest periods, which generally are not present in laboratory fatigue tests in order to...
conference paper 2012
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Soer, M. (author), Klumperink, E. (author), Nauta, B. (author), van Vliet, F. (author)
Phased arrays in CMOS for consumer communication bands aim to enhance receiver performance by exploiting beamforming with antenna arrays. Sensitivity increases with the number of antenna elements through array gain and interferers can be cancelled through the spatial filtering of the beam pattern [1]. For the latter, the linearity of the...
conference paper 2012
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van Heijningen, M. (author), Rodenburg, M. (author), van Vliet, F.E. (author), Massler, M. (author), Tessmann, A. (author), Brückner, F. (author), Müller, S. (author), Schwantuschke, D. (author), Narhi, T. (author)
The 0.1 μm AlGaN/GaN technology and design of two W-band power amplifiers in this technology are described. The dual-stage amplifier reaches an output power of 400 mW at 90 GHz at an operation bias of 20 V. Two designs with different driver to final stage gate width ratio are discussed. More than 10 dB of power gain is reached for a compression...
conference paper 2012
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Brouzes, H. (author), Geurts, S. (author), Besselink, M. (author), Telli, A. (author), de Hek, A.P. (author), van der Bent, G. (author), van Vliet, F.E. (author)
A highly integrated high-power transmitter has been designed in a high breakdown GaAs MMIC technology. The transmitter includes, on top of an S-Band 10 W class-F HPA, a DC/DC converter and its associated gate driver, the full voltage regulation control loop, which provides a significant step for phased array transmit chain miniaturization and...
conference paper 2012
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