Fast Numerical Method for Focal Plane Array Simulation of 3D Vivaldi Antennas

This paper presents the design and analysis of large Focal Plane Arrays (FPA) of thick Taper Slot Antennas (TSA). This communication extends the application of fast numerical method based on Macro Basis Functions (MBF) produced by Array Scanning Method (ASM) to the simulation of planar array of 3D Vivaldi antennas. This simulation technique is validated through the comparison with the brute force solution of a planar array containing 31 thick bowtie antennas. We also studied an array of 71 thick Vivaldi antennas in which we investigated the truncation effects at the array borders. Finally, the manufacturing feasibility of this type of thick Vivaldi antennas is verified by the development and measurement of an array of 4 thick metal only Taper Slot Antennas

Thick Vivaldi antenna for focal plane applications

This communication deals with the design of metal only thick Vivaldi antenna, hollow inside to host a Low Noise Amplifier adjacent to the antenna, that is suitable to focal plane array devoted to radio astronomy. The impedance frequency band of the array goes from 0.75 GHz to 1.5 GHz and has a half-power beam width of 60 degrees over the same frequency band. Numerical simulations have been carried out to study the radiation patterns using the Method-of-Moments approach for infinite array simulations, followed by the implementation of fast numerical methods combining the Array Scanning Method with Macro basis Functions for the simulation of an array consisting of 5x5 elements. \ua9 2011 IEEE.Peer reviewed: YesNRC publication: Ye

Betonconstructies ontwerpen op levensduur

De effectieve levensduur van betonconstructies is vaak moeilijk in te schatten. Soms wordt er reeds schade aan constructies vastgesteld voordat ze hun verwachte levensduur bereikt hebben. Daarom werd er binnen het DurOBet-project een kwantitatieve en probabilistische methode uitgewerkt om de duurzaamheid van betonconstructies in België nauwkeurig te kunnen beoordelen.Nederlands irua-catalogusstatus: publishe