Publications associées à Directivité

Frequency, Radiation Pattern and Polarization Reconfigurable Antenna Using a Parasitic Pixel Layer

This communication presents a reconfigurable antenna capable of independently reconfiguring the operating frequency, radiation pattern and polarization. A switched grid of small metallic patches, known as pixel surface, is used as a parasitic layer to prov ...

Ieee-Inst Electrical Electronics Engineers Inc2014

A unified criterion for the centrifugal instabilities of vortices and swirling jets

François Gallaire

Swirling jets and vortices can both be unstable to the centrifugal instability but with a different wavenumber selection: the most unstable perturbations for swirling jets in inviscid fluids have an infinite azimuthal wavenumber, whereas, for vortices, the ...

Cambridge University Press2013

Microphone Array Beampattern Characterization for Hands-free Speech Applications

Hervé Bourlard, Philip Neil Garner, Mohammadjavad Taghizadeh

Spatial filtering is the fundamental characteristic of microphone array based signal acquisition, which plays an important role in applications such as speech enhancement and distant speech recognition. In the array processing literature, this property is ...

2012

Advanced optical characterization of micro solid immersion lens

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

We report on the advanced optical characterizations of microfabricated solid immersion lenses with 2-mu m diameter, operating at lambda = 642 nm. The main feature, the spot size reduction, has been investigated by applying a focused Gaussian beam of NA = 0 ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2012

Synthesis of uniform amplitude focused beam arrays

Juan Ramon Mosig, Anja Skrivervik, Benjamin Fuchs

An iterative procedure for the synthesis of uniform amplitude focused beam arrays is presented. Specifically, the goal is to optimize the locations of a fixed number of array elements with known excitations in order to synthesize narrow-beam low-sidelobe p ...

2012

BROADBAND BEAMPATTERN FOR MULTI-CHANNEL SPEECH ACQUISITION AND DISTANT SPEECH RECOGNITION

Hervé Bourlard, Philip Neil Garner, Mohammadjavad Taghizadeh

Spatial filtering is the fundamental characteristic of microphone array based signal acquisition which plays an important role in applications such as speech enhancement and distant speech recognition. In the array processing literature, this property is f ...

Idiap2011

Cavity-backed slot array antenna in substrate-integrated waveguide technology

Roberto Torres Sánchez

A slot array placed on the face of a cavity realized in substrate-integrated waveguide technology is presented. Guidelines to design similar antennas are provided. The design has been done with the help of commercial software. The result is a low-cost, dir ...

Wiley-Blackwell2011

Optimal polarization synthesis of arbitrary arrays with focused power pattern

Benjamin Fuchs

The joint synthesis of the spatial power pattern and polarization of arbitrary arrays is addressed. Specifically, the proposed approach gives the solution to a frequently encountered problem, namely the array design (i.e., the determination of the radiatin ...

Institute of Electrical and Electronics Engineers2011

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Directivité

Frequency, Radiation Pattern and Polarization Reconfigurable Antenna Using a Parasitic Pixel Layer

A unified criterion for the centrifugal instabilities of vortices and swirling jets

Microphone Array Beampattern Characterization for Hands-free Speech Applications

Advanced optical characterization of micro solid immersion lens

Spatial Acoustic Signal Processing

Synthesis of uniform amplitude focused beam arrays

BROADBAND BEAMPATTERN FOR MULTI-CHANNEL SPEECH ACQUISITION AND DISTANT SPEECH RECOGNITION

Cavity-backed slot array antenna in substrate-integrated waveguide technology

3D optical Yagi-Uda nanoantenna array

Optimal polarization synthesis of arbitrary arrays with focused power pattern

Graph Chatbot

Chattez avec Graph Search

Advanced optical characterization of micro solid immersion lens

Frequency, Radiation Pattern and Polarization Reconfigurable Antenna Using a Parasitic Pixel Layer

Synthesis of uniform amplitude focused beam arrays

BROADBAND BEAMPATTERN FOR MULTI-CHANNEL SPEECH ACQUISITION AND DISTANT SPEECH RECOGNITION

Cavity-backed slot array antenna in substrate-integrated waveguide technology

Optimal polarization synthesis of arbitrary arrays with focused power pattern

3D optical Yagi-Uda nanoantenna array

Microphone Array Beampattern Characterization for Hands-free Speech Applications

Spatial Acoustic Signal Processing

A unified criterion for the centrifugal instabilities of vortices and swirling jets