Searched for: author:"Llombart Juan, N."
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Zhang, H. (author), Dabironezare, S.O. (author), Carluccio, G. (author), Neto, A. (author), Llombart Juan, N. (author)
In this work, a free accessible MATLAB interface is presented to analyze antenna-coupled Quasi-Optical (QO) systems in reception. This goal is achieved by using Fourier Optics (FO) and Geometrical Optics (GO) based methods. Specifically, the FO method represents the field focalized by a QO component on its focal plane as a plane wave spectrum...
conference paper 2019
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Arias Campo, M. (author), Carluccio, G. (author), Blanco, Darwin (author), Bruni, Simona (author), Litschke, Oliver (author), Llombart Juan, N. (author)
A high-gain broadband leaky-wave fed lens antenna with an integrated dielectric gratings polarizer covering the whole G-band (140-220GHz) is presented. This work focuses on the polarizer gratings manufacturing and in particular on the selection of plastic materials and the fabrication process refinement. The polarizer geometry has been...
conference paper 2019
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Garufo, A. (author), Sberna, P.M. (author), Carluccio, G. (author), Freeman, Joshua R. (author), Bacon, David R. (author), Li, Lianhe (author), Baselmans, J.J.A. (author), Llombart Juan, N. (author), Neto, A. (author)
A pulsed photoconductive terahertz (THz) source is presented that is able to radiate milliwatt (mW) level average power over a large bandwidth, by exploiting both the optical and electrical properties of photoconductive sources and the ultrawideband properties of connected antenna arrays. An optical system composed of a microlenses array...
journal article 2019
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Llombart Juan, N. (author), Dabironezare, S.O. (author), Carluccio, G. (author), Freni, A. (author), Neto, A. (author)
Passive imaging cameras at millimeter and submillimeter wavelengths are currently entering a new era with the development of large format arrays of direct detectors. Several of these arrays are being developed with bare absorbing meshes without any antenna coupling (lens or horn) structures. The design of such arrays is typically done...
journal article 2018
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Arias Campo, M. (author), Blanco Montero, D.J. (author), Carluccio, G. (author), Litschke, Oliver (author), Bruni, Simona (author), Llombart Juan, N. (author)
The exponentially increasing demand for highspeed wireless links can be only efficiently satisfied with the development of future XG wireless communication networks, based on higher carrier signal frequencies, starting from 100 GHz. In this contribution, a circularly polarized G-band leaky-wave fed lens antenna with an integrated dielectric...
conference paper 2018
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Yurduseven, O. (author), Bueno Lopez, J. (author), Yates, Stephen (author), Neto, A. (author), Baselmans, J.J.A. (author), Llombart Juan, N. (author)
There is an increasing demand for large format detector arrays with large bandwidths and high antenna efficiencies for future THz astronomical radiometric applications. For direct detection instruments, it is also desired to have antennas with dual polarization reception in order to increase the received power from incoherent sources, thereby...
journal article 2018
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Dabironezare, S.O. (author), Hassel, Juha (author), Gandini, E. (author), Grönberg, Leif (author), Sipola, Hannu (author), Vesterinen, V.I. (author), Llombart Juan, N. (author)
Passive imaging cameras at sub-millimeter wavelengths with large format focal plane arrays are being developed as the next generation of security screening systems. In this contribution, a dual-band focal plane array (FPA) for security imagers at submillimeter wave frequencies is presented. The detectors are based on bolometric...
journal article 2018
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Dabironezare, S.O. (author), Neto, A. (author), Llombart Juan, N. (author)
Passive imaging cameras at sub-millimeter wave-lengths are currently entering a new era with the development of large format arrays of direct detectors. Several of these arrays are being developed with bare absorbing meshes without any antenna coupling (lens or horn) structures. This paper uses a spectral electromagnetic model to analyze the...
conference paper 2017
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Bueno Lopez, J. (author), Yurduseven, O. (author), Yates, S.J.C. (author), Llombart Juan, N. (author), Murugesan, V. (author), Thoen, D.J. (author), Baryshev, A.M. (author), Neto, A. (author), Baselmans, J.J.A. (author)
We present the design, fabrication, and full characterisation (sensitivity, beam pattern, and frequency response) of a background limited broadband antenna coupled kinetic inductance detector covering the frequency range from 1.4 to 2.8 THz. This device shows photon noise limited performance with a noise equivalent power of 2.5 × 10<sup>-19<...
journal article 2017
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Garufo, A. (author), Carluccio, G. (author), Freeman, Joshua R. (author), Bacon, David R. (author), Llombart Juan, N. (author), Davies, Alexander G. (author), Neto, A. (author)
In this paper a rigorous electromagnetic characterization of the setup for measuring the THz power radiated by pulsed photoconductive antenna is discussed. Such characterization is expressed in terms of efficiencies which quantify how much power is lost in the coupling between the various components involved in the measurement setup. The...
conference paper 2017
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van Berkel, S.L. (author), Malotaux, E.S. (author), Cavallo, D. (author), Spirito, M. (author), Neto, A. (author), Llombart Juan, N. (author)
The design and performance analysis are presented for a passive uncooled radiometer pixel suitable for integration in 28 nm CMOS technology. In the configuration a single wideband antenna, operating from 200 GHz to 600 GHz, is connected to a pn-junction diode. Including the antenna-detector impedance mismatch, the detector shows an average NEP...
conference paper 2017
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Yurduseven, O. (author), Bosma, S. (author), Endo, A. (author), Neto, A. (author), Llombart Juan, N. (author)
DESHIMA (Deep Spectroscopic High-redshift Mapper) is an instrument aiming at efficiently making spectroscopic redshift measurements of sub-mm wave galaxies (SMGs), thereby providing about the formation and the evolution of stars and galaxies. The aim of this work is to provide a preliminary study into the design of a wideband leaky lens antenna...
conference paper 2017
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Llombart Juan, N. (author), Gandini, E. (author), Tamminen, A. (author), Luukanen, A. (author)
The aim of the European project CONSORTIS is the development of a walk-by imaging system for concealed object detections working at submillimetre-wave frequencies. This imager will allow to image a full body at two frequency bands with high sensitivity (&lt;;1K) and large frame rate (10Hz). The imager relies on a large focal plane array with...
conference paper 2016
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Garufo, A. (author), Llombart Juan, N. (author), Neto, A. (author)
In this paper, the performance of logarithmic spiral antennas as feeds of dense dielectric lens are investigated in detail. The performances are evaluated in terms of clean symmetric radiation patterns, high polarization purity, antenna efficiency, and radiation dispersivity. A logarithmic spiral antenna placed in the dielectric-air interface...
journal article 2016
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Alonso Del Pino, M. (author), Reck, Theodore (author), Lee, Choonsup (author), Jung-Kubiak, Cecile (author), Llombart Juan, N. (author), Mehdi, Imran (author), Chattopadhyay, Goutam (author)
This article presents the latest developments of our work related to a micro-lens antenna integrated in a heterodyne receiver using silicon micromachining technology at Terahertz frequencies. The antenna is composed of a waveguide feed which uses a leaky wave cavity to enhance the directivity and illuminate a shallow lens efficiently. The...
conference paper 2016
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Yurduseven, O. (author), Llombart Juan, N. (author), Neto, A. (author)
This paper presents the design and measurements of a wideband dual polarized leaky lens antenna suitable for tightly spaced focal plane arrays. The antenna is composed of two crossed leaky slots fed by two orthogonal microstrips to realize the dual-polarization operation. The crossed microstrips are fed differentially in order to couple the...
journal article 2016
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Blanco, D. (author), Rajo-Iglesias, E. (author), Montesano, A. (author), Llombart Juan, N. (author)
We present a practical implementation of a leaky-wave thinned phased array in printed circuit board (PCB) technology. In this paper, we demonstrate that a reduction of the grating lobes, and therefore an improved gain in a thinned phased array, with respect to standard solutions, is achieved by virtue of the angular filtering introduced by a...
journal article 2016
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Blanco Montero, D.J. (author), Rajo-Iglesias, Eva (author), Maci, Stefano (author), Llombart Juan, N. (author)
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journal article 2015
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Echternach, P.M. (author), Stone, K.J. (author), Bradford, C.M. (author), Day, P.K. (author), Wilson, D.W. (author), Megerian, K.G. (author), Llombart Juan, N. (author), Bueno, J. (author)
We observed a sweep rate dependence of the quantum capacitance in a single Cooper-Pair box used as the readout of a Quantum Capacitance Detector. A model was developed that fits the data over five orders of magnitude in sweep rate and optical signal power and provides a natural calibration of the absorbed power. We are thereby able to measure...
journal article 2013
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Silva-Lopez, M. (author), Cuadrado, A. (author), Llombart Juan, N. (author), Alda, J. (author)
Optical antennas and resonant structures have been extensively investigated due to its potential for electromagnetic detection and energy harvesting applications. However their integration into large arrays and the role of connection lines between individual antennas has drawn little attention. This is necessary if we want to exploit its...
journal article 2013
Searched for: author:"Llombart Juan, N."
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