Coupling matrix filter synthesis based on reflection matrices

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The paper introduces the concept of reflection matrices in the coupling matrix filter reconfiguration. It is shown that reflection matrices are complementary to rotation matrices a useful concept that can be used alternatively to rotation matrices in the similarity transformations that are applied in order to transform the coupling matrix to a suitable form. A cross-coupled filter example is given where both concepts are used.This work has been founded by SIWTUNE Marie Curie CIG no 322162 and DGCYT MTM2012-33073 grants.Müller, A.; Favennec, J.; Sanabria-Codesal, E. (2015). Coupling matrix filter synthesis based on reflection matrices. IEEE. https://doi.org/10.1109/APMC.2015.741179

On the sum of the transmission and reflection coefficient on the Smith chart and 3D Smith chart

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The paper presents in premiere a simple mapping property of the sum of the reflection and transmission parameters of reciprocal two port networks. It is proved that although the reflection and transmission parameter may have very complicated paths on the Smith chart, their sum will be always moving on the unit circle if the circuit is symmetric and lossless. Further once symmetrical losses at the ports occur their sum path will switch on a family of circles through one point. Using inversive geometry we construct a new function which maps this family of circles in lines on the extended Smith chart. The proposed method for checking the symmetry uses just two parameters and avoids testing the phase of the corresponding input and output parameters. By means of the 3D Smith chart we propose in the end an alternative approach to visualize the parameters.This work has been founded by SIWTUNE Marie Curie CIG no 322162, POSDRU/159/1.5/S/134398 and DGCYT MTM2012-33073 grants.Müller, A.; Sanabria-Codesal, E.; Moldoveanu, A.; Asavei, V.; Favennec, J. (2015). On the sum of the transmission and reflection coefficient on the Smith chart and 3D Smith chart. IEEE. https://doi.org/10.1109/APMC.2015.7411635

Epidemiology of airway colonization by Scedosporium apiospermum during cystic fibrosis

With a frequency of about 10%, species of the Scedosporium apiospermum complex (which comprises at least five distinct species with different antifungal susceptibility patterns) rank the second among the filamentous fungi colonizing the airways in cystic fibrosis (CF). Additionally, it is clearly established that these fungi may disseminate in case of immunodeficiency and that a chronic colonization of the airways by these pathogens may hinder the success of lung transplantation. In this study, we develop a new genotyping method to investigate the epidemiology of the airway colonization by these fungi. 63 multiple and sequential isolates of S. apiospermum collected from 9 CF patients, and selected among those previously studied by random amplification of polymorphic DNA (RAPD), were analyzed using the automated typing system DiversiLab (bioMérieux) based on PCR amplification of repetitive sequences. The DiversiLab Aspergillus rep-PCR kit which uses specific primers designed for Aspergillus fumigatus, was compared with the pan-fungus DiversiLab Fungal kit. Amplification products were separated by capillary electrophoresis on Agilent B2100 bioanalyzer, leading to single profiles for each isolate which were then compared using the DiversiLab software. In addition, species identification of these isolates was clarified by sequencing the betatubulin gene. Results obtained with both kits were comparable. Nevertheless, differentiation was easier using the DiversiLab Fungal kit. Additionally, rep-PCR usually confirmed the colonization patterns described by RAPD. Only two patients showed distinct genotypes. For Patient 2, two isolates were analyzed which were undistinguishable by RAPD, but rep-PCR revealed that they belonged to distinct genotypes, suggesting a transient colonization. For Patient 8 which showed by RAPD two distinct genotypes, 5 genotypes were found by rep-PCR with a dominant one represented by 5 isolates and two very close genotypes (corresponding to 3 isolates), while 4 other isolates belonged to two distant genotypes. In conclusion, the automated typing system DiversiLab proved to be an easy and efficient method to investigate the molecular epidemiology of the airway colonization by S. apiospermum in CF. Our results also confirm the capacity of the different species from the S. apiospermum complex to chronically colonize the airways of CF patients

Fully integrated microsystem using microfluidic devices to tune or reconfigure RF circuits

International audienceThis paper presents preliminary de-vices and results of tunable microwave microsystem associating RF circuits and microfluidic components. Dielectric fluids are used to disrupt the permittivity of a microstrip structure and thus change its operating frequency. In this approach, stop-band metallic stubs are placed on top of SU8 structured substrate. Without changing the shape of RF function, its frequency shift is more than 20% when deionized water is flowing in fluidic channels

Fully integrated microsystem using microfluidic devices to tune or reconfigure RF circuits

International audienceThis paper presents preliminary de-vices and results of tunable microwave microsystem associating RF circuits and microfluidic components. Dielectric fluids are used to disrupt the permittivity of a microstrip structure and thus change its operating frequency. In this approach, stop-band metallic stubs are placed on top of SU8 structured substrate. Without changing the shape of RF function, its frequency shift is more than 20% when deionized water is flowing in fluidic channels

Fully integrated microsystem using microfluidic devices to tune or reconfigure RF circuits

International audienceThis paper presents preliminary de-vices and results of tunable microwave microsystem associating RF circuits and microfluidic components. Dielectric fluids are used to disrupt the permittivity of a microstrip structure and thus change its operating frequency. In this approach, stop-band metallic stubs are placed on top of SU8 structured substrate. Without changing the shape of RF function, its frequency shift is more than 20% when deionized water is flowing in fluidic channels