Searched for: author:"Llombart, Nuria"
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Neto, A. (author), Fiorellini Bernardis, A. (author), Emer, Diego (author), Freni, Angelo (author), Llombart, Nuria (author)
The observable field is defined as the portion of the incident field that can contribute to the power received by an antenna. Recently, the observable field was estimated for a plane wave incidence. Here, the procedure is extended to a general incident field expressed as a superposition of homogeneous plane waves. The observable field concept...
journal article 2020
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Arias Campo, M. (author), Blanco, Darwin (author), Neto, A. (author), Llombart, Nuria (author), Bruni, Simona (author)
In order to fulfill the exponential increase in the demand of high-speed wireless links, future XG wireless networks will be developed at higher carrier signal frequencies, reaching the hundreds of gigahertz. In this contribution, a leaky-wave-fed HDPE lens antenna working at ${G}$ -band which can be useful for future XG communications is...
journal article 2020
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Hähnle, S.A. (author), Yurduseven, Ozan (author), van Berkel, S.L. (author), Llombart, Nuria (author), Bueno, Juan (author), Yates, Stephen J.C. (author), Murugesan, Vignesh (author), Thoen, David (author), Neto, A. (author), Baselmans, J.J.A. (author)
We present the design, fabrication, and characterization of a broadband leaky lens antenna for broadband, spectroscopic imaging applications. The antenna is designed for operation in the 300-900 GHz band. We integrate the antenna directly into an Al-NbTiN hybrid microwave kinetic inductance detector (MKID) to measure the beam pattern and...
journal article 2020
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Dabironezare, Shahab Oddin (author), Carluccio, G. (author), Freni, F. (author), Neto, A. (author), Llombart, Nuria (author)
Future sub-millimetre imagers are being developed with large focal plane arrays (FPAs) of lenses to increase the field of view (FoV) and the imaging speed. A full-wave electromagnetic analysis of such arrays is numerically cumbersome and time-consuming. This paper presents a spectral technique based on Fourier Optics combined with Geometrical...
journal article 2020
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Fiorellini Bernardis, A. (author), Sberna, P.M. (author), Neto, A. (author), Llombart, Nuria (author)
Recently, powerful, reliable and cost-effective THz radiation photoconductive-emitters have been developed, providing up to 1mW of pulsed power in the range of frequencies between 0.1 and 0.7THz. In this paper we study the potential use of such sources for future pulsed radar systems aiming at stand-off imaging applications. Specifically, we...
conference paper 2019
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Bosma, S. (author), Alonso-Delpino, Maria (author), Blanco Montero, D.J. (author), Jung-Kubiak, Cecile (author), Llombart, Nuria (author)
In this contribution, we propose an antenna for a dual-band focal plane array (FPA) heterodyne receiver at 210-240 GHz and 500-580 GHz to perform cometary observations. The proposed antenna is composed of a fused silica lens fed by a leaky wave waveguide feed. The dual-band leaky wave feed is based on a single-layer Frequency Selective...
conference paper 2019
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Fiorellini Bernardis, A. (author), Sberna, P.M. (author), Neto, A. (author), Llombart, Nuria (author)
Pulsed terahertz time-domain systems rely on antennas printed on photoconductive substrates (PCA), which show extremely fast conductivity transients when illuminated by femto-seconds laser pulses. This work introduces a time domain representation of the PCA transmitter that accounts for time evolving voltages at the terminals of the...
conference paper 2019
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Bosma, S. (author), Alonso-Delpino, Maria (author), Jung-Kubiak, Cecile (author), Blanco, Darwin (author), Llombart, Nuria (author)
In this contribution, we propose a hybrid electromechanical scanning antenna array architecture suitable for highly directive phased arrays at submillimeter wavelengths with field-of-views (FoV) of+/-30 degrees. The concept relies on combining electrical phase shifting of a sparse array with a mechanical translation of an array of lenses. The...
conference paper 2019
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Endo, A. (author), Karatsu, K. (author), Bosma, S. (author), Ikarashi, S. (author), Klapwijk, T.M. (author), Llombart, Nuria (author), Pascual Laguna, A. (author), Thoen, David (author), de Visser, P.J. (author), Yurduseven, O. (author), Baselmans, J.J.A. (author)
Ultra-wideband, three-dimensional (3D) imaging spectrometry in the millimeter–submillimeter (mm–submm) band is an essential tool for uncovering the dust-enshrouded portion of the cosmic history of star formation and galaxy evolution<sup>1–3</sup>. However, it is challenging to scale up conventional coherent heterodyne receivers<sup>4</sup> or...
journal article 2019
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Endo, A. (author), Karatsu, K. (author), Pascual Laguna, A. (author), Mirzaei, B. (author), Thoen, David (author), van Marrewijk, N.T. (author), Bosma, S. (author), Yurduseven, O. (author), Llombart, Nuria (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author)
Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science, and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled...
journal article 2019
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Dabironezare, S.O. (author), Carluccio, G. (author), Pascual Laguna, A. (author), Hähnle, S.A. (author), Baselmans, J.J.A. (author), Llombart, Nuria (author)
DESHIMA is a spectrometer for astronomical applications targeting sources at sub-mm wavelengths from 240GHz to 720GHz that will operate in the ASTE telescope in Atacama Desert, Chile. In this work, a quasi-optical system based on a hyper-hemispherical leaky lens antenna and a series of Dragonian reflectors is presented as the coupling chain...
conference paper 2019
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van Berkel, S.L. (author), Malotaux, E.S. (author), Spirito, M. (author), Cavallo, D. (author), Neto, A. (author), Llombart, Nuria (author)
A 12-pixel THz Focal Plane Array (FPA), integrated in Global Foundries 22nm CMOS technology, enabling high resolution passive THz imaging, is presented. The array efficiently couples blackbody radiation from 200 GHz to 600 GHz to Schottky Barrier Diodes (SBDs) in a differential topology. An antenna-detector co-design results in an average...
conference paper 2019
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Ferrari, Lorenza (author), Yurduseven, O. (author), Llombart, Nuria (author), Yates, Stephen J.C. (author), Bueno, Juan (author), Murugesan, Vignesh (author), Thoen, David (author), Endo, A. (author), Baryshev, AM (author), Baselmans, J.J.A. (author)
Next generation sub-mm imaging instruments require kilo-pixel focal plane arrays filled with background limited detectors. Microwave kinetic inductance detectors (MKIDs) are a state-of-the-art detector for future instruments due to their inherent multiplexing capabilities. An MKID consists of a superconducting resonator coupled to a feed-line...
journal article 2018
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Dabironezare, S.O. (author), Hassel, J. (author), Gandini, E. (author), Grönberg, L. (author), Sipola, H. (author), Vesterinen, V. (author), Llombart, Nuria (author)
In this contribution, a focal plane array (FPA) at submillimeter wavelengths is presented for security applications. The detectors are based on kinetic inductance bolometers. Two frequency selective absorber (FSA) sets were designed to implement a security imager. The effective pattern of the imager coupled to a black body point source over a...
conference paper 2018
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Garufo, A. (author), Carluccio, G. (author), Freeman, Joshua R. (author), Bacon, David R. (author), Llombart, Nuria (author), Linfield, Edmund H. (author), Davies, Alexander G. (author), Neto, A. (author)
This second part of two papers' sequence presents the experimental validation of the Norton equivalent circuit model for pulsed photoconductive antennas (PCAs) provided in the first paper of the sequence. To this goal, different prototypes of photoconductive antenna sources have been manufactured and assembled. The average powers radiated and...
journal article 2018
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van Berkel, S.L. (author), Malotaux, E.S. (author), Cavallo, D. (author), Spirito, M. (author), Neto, A. (author), Llombart, Nuria (author)
The optical performance of a wideband double bowtie slot antenna, implemented in 28nm CMOS technology, is evaluated. The antenna serves as a verification antenna for an uncooled single-pixel radiometer operating from 200 GHz to 600 GHz. The performance is evaluated in terms of radiometric pattern that is derived from the measured radiation...
conference paper 2018
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Gandini, E. (author), Tamminen, Aleksi (author), Luukanen, Arttu (author), Llombart, Nuria (author)
A wide field of view (FOV) inversely magnified dual-lens system for submillimeter wavelength imagers is presented in this paper. The antenna is designed for near-field focusing, at a range of 2.1 m from the primary aperture and to work in the frequency range from 200 to 600 GHz. The half-power beamwidth (HPBW) is 0.27° (1 cm in the image...
journal article 2018
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Garufo, A. (author), Carluccio, G. (author), Llombart, Nuria (author), Neto, A. (author)
A novel equivalent circuit for pulsed photoconductive sources is introduced for describing the coupling between the photoconductive gap and the antenna. The proposed circuit effectively describes the mechanism of feeding the antenna by the semiconductor when this latter is illuminated by a laser operating in a pulsed mode. Starting from the...
journal article 2018
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Sung, Shijun (author), Dabironezare, S.O. (author), Llombart, Nuria (author), Selvin, Skyler (author), Bajwa, Neha (author), Chantra, Somporn (author), Nowroozi, Bryan (author), Garritano, James (author), Goell, Jacob (author), Li, Alex (author), Deng, S.X. (author), Brown, Elliott (author), Grundfest, Warren S. (author), Taylor, Zachary D. (author)
Reflection-mode terahertz (THz) imaging of corneal tissue water content (CTWC) is a proposed method for early accurate detection and study of corneal diseases. Despite promising results from ex vivo and in vivo cornea studies, interpretation of the reflectivity data is confounded by the contact between corneal tissue and dielectric windows used...
journal article 2018
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Neto, A. (author), Llombart, Nuria (author), Freni, Angelo (author)
In this paper, the portion of the incident field that can be received by an antenna is investigated: the observable field. This field can be estimated relying only on the volume allocated to the antenna and thus independently of the specific antenna geometry. The observable field is composed by a single spherical wave that first converges...
journal article 2018
Searched for: author:"Llombart, Nuria"
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