document

A dielectric dome antenna with reduced profile and wide scanning capability

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

document

A Ka-Band Spaceborne Synthetic Aperture Radar Instrument: A modular sparse array antenna design

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

document

Synthesis of monopulse antenna patterns for elliptical phased array antennas with different peak sidelobes along the principal planes

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

document

Design of a Ka-band sparse array antenna for spaceborne SAR applications

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

document

Sub-wavelength frequency selective surface design for improved antenna array out-of-band rejection

Yepes, C. (author), Cavallo, D. (author), Neto, A. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author)

conference paper 2017

document

25 Years of MMICs for Phased Arrays at TNO

van Vliet, F. (author), van den Bogaart, F.L.M. (author)

bookPart 2015

document

Mutual-Coupling Based Phased-Array Calibration: A Robust and Versatile Approach

Bekers, D.J. (author), van Dijk, R. (author), van Vliet, F.E. (author)

The transmit and receive modules of a large phased array are often calibrated for amplitude and phase variations by an internal calibration network and an offline characterization of the complete array in an anechoic chamber. Such a solution is less obvious in view of current trends towards integration and modularity. An alternative to surpass...

conference paper 2013

document

Integrated filtering in reconfigurable planar phased-array antennas with spurious harmonic suppression

Cifola, L. (author), Gerini, G. (author), Monni, S. (author), van den Berg, S. (author), van de Water, F. (author)

In the present work, the possibility to integrate filtering functionalities in a phased-array antenna at radiating element level is investigated. The filtenna concept has been applied to an X-band phased array of slot-fed patches. An effective strategy for the suppression of spurious harmonics, based on the perturbation of the patch currents of...

conference paper 2013

document

Design of a low-profile printed array of loaded dipoles with inherent frequency selectivity properties

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

document

A Phased Array Antenna Signal Processing Structure, a Method and a Computer Program Product

Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek (author), van Vliet, F.E. (author), van Dijk, R. (author)

The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...

patent 2011

document

A Phased Array Antenna Signal Processing Structure, a Method and a Computer Program Product

Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek (author), van Vliet, F.E. (author), van Dijk, R. (author)

The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...

patent 2011

document

Element failure correction for a large monopulse phased array antenna with active amplitude weighting

Keizer, W.P.M.N. (author), TNO Defensie en Veiligheid (author)

Recently a new method is introduced to synthesize low sidelobe patterns for planar array antennas with a periodic element arrangement. The method makes use of the property that for a planar array with periodic spacing of the elements, an inverse Fourier transform relationship exists between the array factor and the element excitations. This...

article 2007

document

Concept for Measuring and Compensating Array Deformation

TNO Defensie en Veiligheid (author), de Wit, J.J.M. (author), van Rossum, W.L. (author), Otten, M.P.G. (author)

Phased array antennas are increasingly used in modern radar systems. Such systems are very liable to distortion of the relative phases between the radiating elements. For airborne, spaceborne, and naval phased array systems, vibrations of the array structure are an important source of phase distortions. In this paper, a system concept will be...

conference paper 2007

document

Frequency Selective Surfaces Integrated with Phased Array Antennas

TNO Defensie en Veiligheid (author), Monni, S. (author)

doctoral thesis 2005

document

CAD of coaxially end-fed waveguide phased-array antennas

TNO Fysisch en Elektronisch Laboratorium TNO Industrie en Techniek (author), Galdi, V. (author), Gerini, G. (author), Guglielmi, M. (author), Visser, H.J. (author), D'Agostino, F. (author)

An alternative configuration for an infinite coaxially end-fed waveguide phased-array antenna is explored. In the proposed configuration, the integration of the end-fed launcher and the output waveguide, rather than the waveguide in itself, acts as a basic radiator. This allows the design of more compact antenna elements. In order to analyze and...

article 2002

document

Photonic integration for phased-array applications

van Vliet, F.E. (author), Stulemeijer, J. (author), Benoist, K.W. (author), Smit, M.K. (author), TNO Fysisch en Elektronisch Laboratorium (author)

The use of photonics for phased-array applications has been discussed for quity some time. Main difficulties up to now have been the component count and cost for relative complex systems. The advances in photonic integration are very promising to bring down both, as well as reduce volume and weight of phased-array beamforming networks as...

conference paper 1999

document

Photonic Integrated Circuits for Phased-Array Beamforming

van Vliet, F.E. (author), Stulemeijer, J. (author), Benoist, K.W. (author), Maat, D.H.P. (author), Smit, M.K. (author), van Dijk, R. (author), TNO Fysisch en Elektronisch Laboratorium (author)

Photonic integration is very promising to bring down volume and weight of phased-array beamforming networks. In addition, photonics allows for increased functionality for wide bandwidth systems. In this paper we demonstrate the feasibiÌity of phase and amplitude control of a 16-elernent phased-array antenna with a single InP integrated circuit....

conference paper 1999

document

Planar, Faceted and Curved Array Antenna Research at TNO Physics and Electronics Laboratory

Visser, H.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)

An overview is presented of research carried out at TNO Physics and Electronics Laboratory in the field of phased anay antennas. Started is with a brief historical overview and a presentation of the antenna measurement facilities. Then full wave analysis methods for infinite planar waveguide arrays are discussed and ways to use these methods for...

conference paper 1999

document

Coherent Photonic Integrated Beamformer for Phased-Array Antennas

Stulemeijer, J. (author), van Vliet, F.E. (author), Benoist, K.W. (author), Maat, D.H.P. (author), Smit, M.K. (author), TNO Fysisch en Elektronisch Laboratorium (author)

The feasibility of an extremely compact Photonic Integrated Circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally

conference paper 1999

document

Photonic integrated circuits for radar beam control

Stulemeijer, J. (author), Smit, M.K. (author), van Vliet, F.E. (author), van den Bogaart, F.L.M. (author)

Photonic integrated circuits have the potential to reduce the volume and weight of optical beamforming networks for phased-array radar antennae by more than one order of magnitude, and will drastically reduce packaging and interconnection costs by integrating subcircuits, consisting of many components, on a single chip. Most work on optical...

article 1999