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Garufo, A. (author), Carluccio, G. (author)Analytical formulations of the active admittance and impedance of connected arrays based on dipole and slot antennas, respectively, when elements are arranged in a hexagonal lattice, are presented. Different canonical dielectric layers stratifications are considered. The formulations is based on multi-layer Green’s function spectral...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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Garuffo, A. (author), Bolt, R.J. (author), Suijker, E. (author), Kaminski, P. (author), Geurts, M. (author), Acar, M. (author), Bergman, J.W. (author), Mandamparambil, R. (author), Monni, S. (author)This article presents latest developments on mm-wave microstrip antennas in package at TNO. Two designs examples for 5G applications are presented: a 28 GHz Antenna in Package (AiP) module for mobile handset and a 26 GHz array antenna for base stations (BS), both in dual linear polarization. The AiP module consists of 2 linear arrays for...conference paper 2021
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Cox, P.B. (author), van Rossum, W.L. (author)Recent advances in digital beam forming for phased arrays in combination with digital signal processing should enable the development of multibeam radar in a bistatic configuration. In the bistatic setting, the pulse travelling outward from the transmitter should be followed or “chased” by the receiver. During transmission, depending on the...conference paper 2020
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Gandini, E. (author), Silvestri, F. (author), Benini, A. (author), Gerini, G. (author), Martini, E. (author), Maci, S. (author), Vigano, M.C. (author), Toso, G. (author), Monni, S. (author)The design and experimental validation of a wide scanning dome antenna with reduced profile is presented. The antenna is based on the combination of a planar phased array with limited scanning capabilities and a dielectric lens which allows to broaden the field of view. The angular variation of the scan loss can be almost arbitrarily designed if...article 2020
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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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Bekers, D.J. (author), Jacobs, S. (author), Monni, S. (author), Bolt, R.J. (author), Fortini, D. (author), Capece, P. (author), Toso, G. (author)The article presents the design of a Ka-band synthetic aperture radar (SAR) instrument based on innovative phased-array antennas, with steering capability in azimuth and elevation. To limit the complexity and costs associated with conventional large active arrays with regular layouts, a sparse array concept is presented. The proposed approach...article 2019
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Gandini, E. (author), Silvestri, F. (author), Benini, A. (author), Gerini, G. (author), Martini, E. (author), MacI, S. (author), Viganò, M.C. (author), Toso, G. (author), Monni, S. (author)A wide scanning dome antenna with reduced profile is presented in this contribution. The minimum height of the dielectric lens is derived from its geometrical configuration and imposed in the design. The antenna is analysed using in-house ray tracing and physical optics tools. Because of the presence of the lens, the phase distribution of the...conference paper 2019
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Genderen, P.V. (author), Stolp, E. (author), Heebels, G. (author)This paper addresses the early developments that have resulted in the design and development of active electronically scanned arrays (AESA) in The Netherlands. An early type of radar measuring the position of objects in range, azimuth and elevation in three dimensions (SPS-01/MTTR) is described in some detail. Requirements of the Royal...conference paper 2019
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Keizer, W.P.M.N. (author)This paper deals with the synthesis of monopulse antenna patterns, sum and difference ones, for planar phased array antennas with an elliptical aperture boundary featuring unequal ultra-low peak sidelobe levels (PSLLs) for the two principal planes of its far field. The used synthesis method is the iterative Fourier transform (IFT) approach. The...article 2019
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Keizer, W.P.M.N. (author)This article will deal with the impact of mutual coupling on the far-field peak sidelobe performance of a finite planar phased-array antenna having a circular aperture shape and containing 2,066 elements arranged in a triangular grid. The radiator that is used is of the open-ended rectangular waveguide type, vertically polarized. The computation...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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Bekers, D.J. (author), Jacobs, S. (author), Bolt, R.J. (author), Monni, S. (author), Fortini, D. (author), Germani, C. (author), Capece, P. (author), Toso, G. (author)In this paper a novel sparse layout for the radiating aperture of a Ka-band spaceborne SAR is outlined. Starting from a set of typical requirements and the definition of a benchmark antenna, an approach to achieve sparsity (in terms of the number of active modules) is proposed, which reduces significantly the fill factor as compared to the...conference paper 2017
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Silvestri, F. (author), Benini, A. (author), Gandini, E. (author), Gerini, G. (author), Martini, E. (author), Maci, S. (author), Vigano, M.C. (author), Geurts, M. (author), Toso, G. (author), Monni, S. (author)This paper presents design considerations for the development of wide-scanning antennas for on-craft satellite communications. A scanning coverage of 80° is required for this application over a 15% fractional bandwidth in Ka-band. A solution based on a phased array illuminating a passive superstrate is identified as the most promising. A fully...conference paper 2017
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Silvestri, F. (author), Gerini, G. (author), Gandini, E. (author), Monni, S. (author), Viganò, M.C. (author), Benini, A. (author), Martini, E. (author), Maci, S. (author), Toso, G. (author)Design considerations on a wide-scanning array antenna for on-craft satellite communications are presented in this paper. For this type of application, a scanning coverage of 80° over a 15% fractional bandwidth in Ka-band is required. A solution based on a passive superstrate illuminated by a phased array is recognized as the most encouraging....conference paper 2017
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- Yepes, C. (author), Cavallo, D. (author), Neto, A. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author) conference paper 2017
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Soer, M.C.M. (author), Klumperink, E.A.M. (author), van den Broek, D.J. (author), Nauta, B. (author), van Vliet, F.E. (author)Spatial interference rejection in analog adaptive beamforming receivers can improve the distortion performance of the circuits following the beamforming network, but is susceptible to the nonlinearity of the beamforming network itself. This paper presents an analysis of intermodulation product cancellation in analog active phased array receivers...article 2017
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Silvestri, F. (author), Cifola, L. (author), Gerini, G. (author)In this paper, we present the full process of designing anisotropic metamaterial (MM) wide angle impedance matching (WAIM) layers. These layers are used to reduce the scan losses that occur in active phased arrays for large scanning angles. Numerical results are provided to show the improvement in performances that such layers can ensure. The...article 2016
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- van Vliet, F. (author), van den Bogaart, F.L.M. (author) bookPart 2015
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van Rossum, W. (author), Huizing, A. (author)In a phased array radar which uses Multiple Input Multiple Output (MIMO) techniques, each (group of) element(s) transmits a different waveform. This extra degree of freedom in the design of a phased array radar potentially yields an advantage for improved suppression of sidelobe clutter and jamming. In this paper a Space-Time Block Coding (STBC)...conference paper 2015