Searched for: author%3A%22van+Vliet%2C+F.E.%22
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van Heijningen, M. (author), van Vliet, F.E. (author)
public lecture 2022
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van Heijningen, M. (author), Ribeiro, D.C.A. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
This paper discusses the characterization of GaN transistors or MMICs under pulsed high-power stress and their recovery behaviour. A fully calibrated measurement setup is introduced where both forward and reflected waves are measured at input and output. In particular, also the effect of trapping due to the RF pulse on for example the insertion...
conference paper 2022
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van der Bent, G. (author), de Hek, A.P. (author), Knight, R.J. (author), van Vliet, F.E. (author)
In this article the feasibility and benefits of tacked-FET structures in a state-of-art GaN technology are investigated. Trade-offs between output power, efficiency and stability are made to yield stable, high performance devices. The results of three S-band GaN stacked-FET structures in the UMS GH25-10 technology are given. These structures are...
conference paper 2022
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de Hek, A.P. (author), van de Bent, G. (author), van Vliet, F.E. (author)
A state-of-the-art, second harmonically tuned, 400 W S-band MMIC power amplifier has been developed. This amplifier delivers in the 2.8 – 3.3 GHz band an output power of 400 W and a PAE between 50-55%. The obtained amplifier performance is the result of the structured design approach discussed in this paper.
conference paper 2022
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Atanasov, A.N. (author), Alink, M.S.O. (author), Van Vliet, F.E. (author)
We present a simple and useful figure of merit (FoM) with which to evaluate the performance of simultaneous-multi-beam (SMB) transmit (TX) antenna arrays. The FoM builds upon the power-aperture product and effective isotropic radiated power for single-beam arrays and extends it to SMB arrays. The FoM is the product of radiated power, antenna...
conference paper 2022
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Essing, J.A.J. (author), Bossuet, A. (author), Knight, R.J. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
This paper describes an integrated S-band phaseshifter driver-amplifier to drive Gallium-Nitride (GaN) based power amplifiers in a phased-array radar transmit chain. This phase driver is implemented in a 0.25μm SiGe BiCMOS process and packaged into a QFN5x5. By using device stacking, the phase driver achieves an output power of more than 32.5dBm...
conference paper 2021
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Atanasov, A.N. (author), Ahmad, W.H.R.A.M. (author), Alink, M.S.O. (author), van Vliet, F.E. (author)
We propose a fast and simple method to accurately determine the compressing stage in a two-stage amplifier system based on reverse intermodulation and hot S-parameter measurements. The method uses no specialized hardware and needs little reconfiguration, simplifying the measurements. We demonstrate its validity over a broad range of amplifiers...
conference paper 2021
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Yepes, C. (author), Gandini, E. (author), Monni, S. (author), Neto, A. (author), van Vliet, F.E. (author), Cavallo, D. (author)
In this letter, we present a design of a linear array of tilted dipoles to achieve radiation patterns with asymmetric angular filtering characteristics. To realize the asymmetric radiation, the dipole elements are spaced by a distance larger than half a wavelength, thus allowing for grating lobes to occur in the visible region. Moreover, the...
article 2020
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van Wanum, M. (author), Lia, E. (author), de Boer, L. (author), Bronts, L.Q. (author), Marien Rodenburg, M. (author), Jacobs, B. (author), Inácio, A.I. (author), van Heijningen, M. (author), van Vliet, F.E. (author)
This paper describes a Ku-band up-converter for low cost satellite Machine to Machine (M2M) applications. The up-converter comprises a heterodyne sliding-IF architecture. This converts the baseband input signal (0 – 20 MHz) to the RF output signal (13.75 – 14.75 GHz). The necessary Local Oscillator (LO) signals are generated by an on-chip...
conference paper 2020
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van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author), Ouarch, A. (author)
A 100 W single chip GaN HPA for radar applications is designed, manufactured and measured. This HPA delivers a peak output power of 107 W at a PAE of more than 55 %. The operational equency band of the HPA is from 2.9 GHz to 3.4 GHz. High quality non-linear transistor models and advanced simulations of RF performance, amplifier stability and...
conference paper 2020
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van Cappellen, W.A. (author), Deborgies, F. (author), Ruggiano, M. (author), van Vliet, F.E. (author)
[No abstract available]
conference paper 2020
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van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
The manufacturing of radar front-ends is preferably performed with components that are fully tested and known to be functional. This decreases the chances of instant failure or rapid degradation of the system. Complete testing of the RF-performance of the individual MMICs, however, is not always possible due to technical, infrastructural or...
conference paper 2019
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van Heijningen, M. (author), van Vliet, F.E. (author)
public lecture 2019
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Yepes, C. (author), Neto, A. (author), Cavallo, D. (author), Gandini, E. (author), van Vliet, F.E. (author), Monni, S. (author)
We present the design of an array of tilted dipoles loaded with artificial dielectrics, to achieve asymmetric radiation patterns. First, a simplified array element consisting of skewed stacked dipoles in the presence of a backing reflector is studied, by means of a dedicated spectral periodic method of moments (MoM). The analysis of the stacked...
conference paper 2019
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Yepes, C. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author), Neto, A. (author), Cavallo, D. (author)
In this work, we present a study on the radiation and impedance properties of antenna arrays with tilted elements. We developed a spectral method of moments (MoM) for the analysis of doubly-periodic arrays with arbitrarily tilted dipole or stacked dipole elements, in free space or in the presence of a backing reflector. By using this analysis...
conference paper 2019
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van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author)
The manufacturing of radar front-ends is preferably performed with components that are fully tested and known to be functional. This decreases the chances of instant failure or rapid degradation of the system. Complete testing of the RF-performance of the individual MMICs, however, is not always possible due to technical, infrastructural or...
conference paper 2019
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van der Bent, G. (author), de Hek, P. (author), van Vliet, F.E. (author)
The application of stacked-FETs in power ampli fiers allows for a supply voltage higher than supported by the breakdown voltage of a single transistor. Potential benefits of the increased supply voltage are reduced supply currents and a lower matching ratio at the output of the amplifier. Furthermore, an increased output power per chip area is...
article 2019
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Yepes, C. (author), Cavallo, D. (author), Gandini, E. (author), Monni, S. (author), Neto, A. (author), van Vliet, F.E. (author)
five-layer frequency selective surface (FSS) composed of subwavelength elements with large harmonic rejection bandwidth is presented. The FSS design is based on an equivalent circuit model, where the interlayer interaction is only described with a single transmission line representing the fundamental Floquet wave. A prototype of the designed FSS...
article 2018
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Yepes, C. (author), Gandini, E. (author), Dijk, R.V. (author), Bruning, F. (author), Maalderink, H. (author), Monni, S. (author), van Vliet, F.E. (author)
A 24 GHz antenna design for miniaturized FMCW radar is presented. The antenna was manufactured with additive manufacturing technology at TNO. The characterization of the polymer material used in the fabrication was carried out and the measurement results of the antenna are presented in this work. A good agreement between simulations and...
conference paper 2018
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van Wanum, M. (author), de Boer, L. (author), van Vliet, F.E. (author)
This paper describes a fractional-N PLL IC with absolute phase control utilizing an on-chip loop-filter. The frequency range is 2.6 to 3.5 GHz, which covers one of the bands for future low-band 5G telecommunication systems. For phased-array operation a compact form-factor is needed as the space available for the complete front-end is limited by...
conference paper 2018
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