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Sberna, P.M. (author), Bernardis, A.F. (author), Garufo, A. (author), Bueno, J. (author), Llombart, N. (author), Neto, A. (author)Photo-conductive lens antennas (PCAs) exploit the ultra-short photoconductivity phenomenon of specific semiconductors in order to generate pulsed radiation in the THz regime. State of the art PCAs suffer from high dispersion and low radiation efficiency over the large generated bandwidth due to the poor coupling between the antenna and the...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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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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- Garufo, A. (author), Sberna, P.M. (author), Carluccio, G. (author), Freeman, J.R. (author), Bacon, D.R. (author), Li, L. (author), Bueno, J. (author), Baselmans, J.J.A. (author), Linfield, E.H. (author), Davies, A.G. (author), Llombart, N. (author), Neto, A. (author) 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), Van Schelven, R. (author), Cavallo, D. (author), Gandini, E. (author), Neto, A. (author)In this work we present a study to determine the parameters affecting the power radiated in specific directions by antenna arrays with tilted elements. We developed an efficient Method of Moments for the analysis of linear arrays with arbitrarily tilted dipole elements, in free space or in the presence of a backing reflector. By using this...conference paper 2018
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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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Yepes, C. (author), Cavallo, D. (author), Neto, A. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author)We present the design of a frequency selective surface (FSS) with large harmonic rejection bandwidth. The FSS comprises five metal layers, each consisting of a periodic array of subwavelength elements. The design is based on an equivalent transmission line model that includes only the fundamental Floquet mode. This model is valid under the...conference paper 2017
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Bolt, R.J. (author), Cavallo, D. (author), Gerini, G. (author), Deurloo, D. (author), Grooters, R. (author), Neto, A. (author), Toso, G. (author)In this paper, we present the characterization of a Ku-band connected-dipole array for mobile Satcom application. The prototype array consists of 2 × 256 dipole radiators arranged in a square grid, to form 16 × 16 dual-polarized cells. It has been designed to operate over a wideband ranging from 10.7 to 14.5 GHz (30%), accommodating in a single...article 2016
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Cavallo, D. (author), Gerini, G. (author), Bolt, R.J. (author), Deurloo, D. (author), Grooters, R. (author), Neto, A. (author), Toso, G. (author), Midthassel, R. (author)We present a Ku-band dual-polarized phased array demonstrator for satellite communications. The prototype array is composed by 512 connected-dipole elements, 16x16 for each polarization, arranged in an egg-crate configuration. A loop-shaped feed structure is used to maintain good polarization purity for beam scanning up to 60 degrees in any...conference paper 2013
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Cavallo, D. (author), Neto, A. (author), Gerini, G. (author), Micco, A. (author), Galdi, V. (author)A wideband, wide-scan phased array of connected dipoles has been designed and fabricated. Measured results from a 7 7 prototype demonstrator are presented for experimental validation. In order to avoid common-mode resonances that typically affect this type of array, loop-shaped transformers are included in the feed network. The common-mode...article 2013
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Vaddagiri, K. (author), Monni, S. (author), Neto, A. (author), Nennie, F. (author), van Rossum, W. (author)This paper presents a novel ultra wide band (UWB) leaky slot antenna. The antenna has a wide impedance bandwidth from 3 to 14 GHz and it is suitable for radar applications requiring high resolution, phase center stability and good pulse preservation, such as medical imaging and ground penetrating radar. © 2013 EurAAP.conference paper 2013
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Neto, A. (author), Ettorre, M. (author), Gerini, G. (author), de Maagt, P. (author)The use of dielectric super-layers for shaping the radiation pattern of focal plane feeds of a multibeam reflector system is discussed. Using the super-layers, it is possible to reduce the spillover from the reflectors without increasing the dimension of each aperture. The effect has been demonstrated using a realistic array configuration. The...article 2012
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Cavallo, D. (author), Gerini, G. (author), Bolt, R. (author), Grooters, R. (author), Deurloo, D. (author), van Zalk, B. (author), Neto, A. (author), Toso, G. (author), Midthassel, R. (author)This work reports on the development and performance of a doubly-polarized array of connected dipoles for in-flight entertainment. The array is designed to simultaneously operate in the uplink and the downlink bands, with an overall bandwidth of about 30%, from 10.7 to 14.5 GHz. The array prototype comprises 16×16 elements in each polarization...conference paper 2012
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Cavallo, D. (author), Neto, A. (author), Gerini, G. (author)A wideband, wide-scan prototype phased array of connected dipoles has been manufactured and tested from 3 to 5 GHz. The array comprises 7 × 7 elements, each fed by a loop-shaped transformer to avoid common-mode resonances. Such resonances typically affect this type of arrays, with consequent degradation of the polarization performance. The...conference paper 2012
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Cavallo, D. (author), Neto, A. (author), Gerini, G. (author)Wideband arrays of printed dipoles with inter-element loads are investigated. A closed-form expression for the active input impedance of the array element is derived with a spectral domain approach. The procedure is based on an extension of the Green's function formulation for arrays of connected dipoles to the case of dipoles coupled via loads....article 2012
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Iacono, A. (author), Bencivenni, C. (author), Freni, A. (author), Neto, A. (author), Gerini, G. (author)The growing attention for Terahertz technology finds support in the high number of applications which will benefit by its use. In the space science sector, the investigation of the THz frequency range will improve the knowledge of the universe, giving a clearer view on its origin and its evolution. In this paper an overview of the work done on...conference paper 2012
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Neto, A. (author), Cavallo, D. (author), Gerini, G. (author)This paper presents a Green's function based procedure to assess edge effects in finite wideband connected arrays. Truncation effects are more severe in broadband arrays, since the inter-element mutual coupling facilitates the propagation of edge-born waves that can become dominant over large portions of the arrays. As a consequence, the overall...conference paper 2011
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Cavallo, D. (author), Savoia, S. (author), Gerini, G. (author), Neto, A. (author), Galdi, V. (author)This work presents the design of a low-profile array of printed dipoles with inherent filtering properties for radar applications. The antenna and the band-pass filter are integrated in a single module, which is small enough to fit within the array unit cell (with period of about 0.4 ? at the highest operational frequency). The array element may...conference paper 2011