Searched for: mods_originInfo_dateIssued_s:"2008"
(1 - 18 of 18)
document
Neto, A. (author), Ettorre, M. (author), Gerini, G. (author), de Maagt, P.J. (author), TNO Defensie en Veiligheid (author)
This work is the fourth of a series on the use of super-layers to shape the radiation pattern of each of the feeds composing a focal plane imaging array. Using dielectric or Frequency Selective Surface type of super-layers the spill over from the reflectors is reduced without increasing the dimensions of each aperture. This effect is achieved...
conference paper 2008
document
Llombart, N. (author), Neto, A. (author), Gerini, G. (author), Bonnedal, M. (author), de Maagt, P. (author), TNO Defensie en Veiligheid (author)
The impact of mutual coupling between neighboring radiators in an imaging array configuration in the presence of a dielectric super-layer is investigated. The super-layer generally aims at increasing the directivity of each element of the array. However, here it is shown that the directivity of the embedded element patterns are reduced by a high...
article 2008
document
Ettorre, M. (author), Neto, A. (author), Gerini, G. (author), Maci, S. (author), TNO Defensie en Veiligheid (author)
This work proposes a leaky-wave slot array antenna fed by a dual offset Gregorian reflector system realized by pins in a parallel plate waveguide. The radiating part of the antenna is composed by parallel slots etched on one side of the same parallel plate waveguide. The dual offset Gregorian reflector system is fed by an arrangement constituted...
conference paper 2008
document
Neto, A. (author), TNO Defensie en Veiligheid (author), IEEE (author)
A novel strategy for broad band focal plane array design is proposed. Its purpose is to couple the radiation from a Large FID reflector system to an array of Kinetic Inductance detectors that are being investigated and realized at SRON. To maximize the benefits from using their BW properties the idea is to use Leaky Lens based array elements, as...
conference paper 2008
document
Cavallo, D. (author), Neto, A. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
The constantly increasing demand of advanced sensors and communications systems aboard of military platforms (ships, UAVs, aircraft, land vehicles, etc.) requires a high number of antennas, covering a very wide frequency spectrum. An interesting and significant example is given by typical RF functions on board of multifunction frigates. These...
conference paper 2008
document
van Dijk, R. (author), Neto, A. (author), Akkermans, J.A.G. (author), Mills, J. (author), TNO Defensie en Veiligheid (author)
At most frequencies currently in use for short range data communication the available bandwidth is limiting the data rate. However, around 60 GHz there is an unlicensed frequency band with ample bandwidth appointed to support high data rate communication. Moreover, semiconductor technology for this frequency range is maturing and price levels...
conference paper 2008
document
Neto, A. (author), Ettorre, M. (author), Gerini, G. (author), de Maagt, P.J. (author), TNO Defensie en Veiligheid (author)
This work is an extension of a series of works on the use of dielectric super-layers to shape the radiation pattern of each feed composing a focal plane imaging array. Using dielectric super-layers, the spill over from the reflectors are reduced without increasing the dimensions of each aperture. These effects are achieved when the inter-element...
conference paper 2008
document
Yates, S.J.C. (author), Baselmans, J.J.A. (author), Barends, R. (author), Lankwarden, Y.J.Y. (author), Hoevers, H.F.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Neto, A. (author), Bekers, D.J. (author), Gerini, G. (author), Doyle, S. (author), Mauskopf, P.D. (author), Ade, P. (author), TNO Defensie en Veiligheid (author)
To achieve background limited detection, future space missions in the far infrared and sub-mm radiation bands will require large arrays (>1000 pixels) of very sensitive detectors. A typical requirement for the noise equivalent power is 10^-19 W/Hz^0.5 for a Fourier Transform Spectrometer, which is 100 to 1000 times more sensitive than the state...
conference paper 2008
document
Neto, A. (author), Cavallo, D. (author), Gerini, G. (author), Toso, G. (author), van Vliet, F.E. (author), TNO Defensie en Veiligheid (author)
In this paper the impedances of connected arrays of slots and dipoles are presented. The study is based on the rigorous Green’s Functions (GF) of the two structures in infinite array environments. The preliminary investigations indicates that the potentials of the connected slots when scanning are limited, due to the excitation of a leaky wave...
conference paper 2008
document
Baselmans, J.J.A. (author), Yates, S. (author), Neto, A. (author), Bekers, D. (author), Gerini, G. (author), Baryshev, A. (author), Lankwarden, Y.J.Y. (author), Hoevers, H. (author), TNO Defensie en Veiligheid (author)
We have designed a novel sub-mm radiation detector based upon a twin slot antenna placed in the focus of a Si elliptical lens. We use a novel Electromagnetic Band Gap (EBG) super-layer, consisting of 2 1/4 γ dielectric layers of Si (ε=11.7) and SiO2 (ε=4) and a Si carrier wafer to enhance the directivity of the feed. The antenna is coupled to a...
conference paper 2008
document
Neto, A. (author), Bekers, D.J. (author), Gerini, G. (author), Baselmans, J. (author), Yates, S. (author), Hoevers, H. (author), TNO Defensie en Veiligheid (author)
This paper presents a truly integrated antennas in mm and sub-mm wave regimes can be realized by printing planar radiating elements in the focal plane of elliptical or extended hemispherical lens antennas. The elliptical shape of the lens gives high focusing properties provided that its eccentricity is properly related to its dielectric constant...
conference paper 2008
document
Ettorre, M. (author), Neto, A. (author), Gerini, G. (author), Maci, S. (author), TNO Defensie en Veiligheid (author)
Planar leaky-wave antennas (LWAs) have received much attention in the recent years [1] for applications in the millimeter-wave ranges. In particular the compatibility with printed circuit board technology (PCB) and the low profile are the strongest features of these antennas. Mono dimensional planar leaky-wave antennas, as in [2], are...
conference paper 2008
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Pasian, M. (author), Neto, A. (author), Monni, S. (author), Ettorre, M. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
This paper deals with the use of Frequency Selective Surfaces (FSS) to increase the Efficiency × Bandwidth product in Ultra-Wide Band (UWB) antenna arrays whose efficiency is limited by the front-to-back ratio. If the backing reflector is realized in one metal plane solution its location will be suitable as antenna ground plane only on a limited...
conference paper 2008
document
Chattopadhyay, G. (author), Llombart, N. (author), Bradford, C.M. (author), Neto, A. (author), TNO Defensie en Veiligheid (author)
Micromesh bolometers have been used in several instruments working in the submillimeter band (e.g. [1]). The bolometers are usually placed inside a waveguide and consist of a mesh absorber, at a certain distance from a back short. The mesh is made of SiNi whose thermal conductivity is tuned to the incident power and operating temperature. The...
conference paper 2008
document
Bolt, R.J. (author), Bruni, S. (author), Neto, A. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
This contribution describes the design and characterization of a very compact 8-element proximity fed cavity antenna array realized completely in PCB technology. The cavities are formed by the placement of a series of through pins (vias) along a rectangular outline. Micro-strip lines excite the structure, and slot coupling is used to feed the...
conference paper 2008
document
Llombart, N. (author), Neto, A. (author), Gerini, G. (author), Bonnedal, M. (author), de Maagt, P. (author), TNO Defensie en Veiligheid (author)
The performance of multibeam focal plane arrays feeding a single aperture is usually reduced due to conflicting requirements on the feed elements. Dense packing is usually required to minimize the beam separation, while typically large feed apertures are needed to provide the high feed directivity to reduce spillover losses from the reflector....
article 2008
document
Cavallo, D. (author), Neto, A. (author), Gerini, G. (author), Toso, G. (author), TNO Defensie en Veiligheid (author)
conference paper 2008
document
Maci, S. (author), Ettorre, M. (author), Neto, A. (author), Gerini, G. (author), TNO Defensie en Veiligheid (author)
A leaky-wave slot array antenna fed by a dual offset Gregorian reflector system is realized by pins in a parallel plate waveguide. The radiating part of the antenna is composed by parallel slots etched on one side of the same parallel plate waveguide. The dual offset Gregorian reflector system is fed by an arrangement constituted by two vias and...
article 2008
Searched for: mods_originInfo_dateIssued_s:"2008"
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