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12 results on '"Giannetti, Giacomo"'

2. A Compact Low-Loss Single-Layer Vialess Diplexer Based on Complementary Microstrip Spiral Resonators for Satellite Communications.

Author

Giannetti, Giacomo, Maddio, Stefano, and Selleri, Stefano

Subjects
MICROSTRIP resonators, TELECOMMUNICATION satellites, INSERTION loss (Telecommunication), DESIGN
Abstract

The design of a compact low-loss diplexer based on complementary microstrip spiral resonators is described. The resonant elements are two: one is low-pass (channel A) and the other is passband (channel B). The low-pass element is composed of spirals departing from a circle, whereas the passband element is composed of spirals etched on a circle. The former element is novel and has been extensively analyzed here. These elements are connected using a star nonresonant Y-junction to form a single-layer vialess diplexer. As an example, a diplexer working at 0.87 and 2.0 GHz for satellite communications is manufactured and tested. The measured data show an insertion loss equal to 0.58 dB (0.66 dB) for channel A (B). The return loss exceeds 15 dB for both channels, and the dimensions are 0.129 λ × 0.265 λ ≈ 0.0343 λ² . [ABSTRACT FROM AUTHOR]

Published
2024
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8. Commissioning and first results of an x-band LLRF system for TEX test facility at LNF-INFN

Author

Piersanti, Luca, Alesini, David, Bellaveglia, Marco, Bini, Simone, Buonomo, Bruno, Cardelli, Fabio, Di Giulio, Claudio, Di Pasquale, Enrico, Diomede, Marco, Faillace, Luigi, Falone, Antonio, Franzini, Giovanni, Gallo, Alessandro, Giannetti, Giacomo, Liedl, Andrea, Moriggi, Daniele, Pioli, Stefano, Quaglia, Sergio, Sabbatini, Lucia, Scampati, Michele, Scarselletta, Giorgio, Stella, Angelo, Tocci, Simone, and Zelinotti, Luca

Subjects
History, Accelerator Physics, MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects, Computer Science Applications, Education
Abstract

In the framework of LATINO project (Laboratory in Advanced Technologies for INnOvation) funded by Lazio regional government, the commissioning of the TEst stand for X-band (TEX) facility has started in 2021 at Frascati National Laboratories of INFN. Born as a collaboration with CERN to test high gradient accelerating structures, during 2022 TEX aims at feeding the first EuPRAXIA@SPARC_LAB X-band structure prototype. During 2021 the commissioning has been successfully carried out up to 48 MW. The power unit is driven by an X-band low level RF system, that employs a commercial S-band (2.856 GHz) Libera digital LLRF (manufactured by Instrumentation Technologies), with an up/down conversion stage and a reference generation and distribution system able to produce coherent frequencies for the American S-band and European X-band (11.994 GHz), both designed and realized at LNF. The performance of the system, with a particular focus on amplitude and phase resolution, together with klystron and driver amplifier jitter measurements, will be reviewed in this paper. Moreover, considerations on its suitability and main limitations in view of EuPRAXIA@SPARC_LAB project will be discussed., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

Published
2023

9. Considerations on boundary conditions in transformation optics for complete field computation in generic waveguides.

Author

Gentili, Gian Guido, Giannetti, Giacomo, Pelosi, Giuseppe, and Selleri, Stefano

Subjects
*TRANSFORMATION optics, *MAXWELL equations, *CLOAKING devices
Abstract

Transformation optics is a powerful tool allowing remapping a generic domain into another yet maintaining a correspondence of the solution of Maxwell's equations within the two domains. Transformation optics has been used in the past to conveniently solve for modes in a generic waveguide by transforming its cross‐section into a circular one. Such a transformation needs particular care in enforcing boundary conditions in the transformed, circular, domain. In this paper, a theoretical treatment of boundary conditions is presented, allowing for an accurate computation of all field components in a generic waveguide. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Modes computation in arbitrarily shaped waveguides by a transformation optics approach.

Author

Gentili, Gian Guido, Giannetti, Giacomo, Khosronejad, Misagh, Pelosi, Giuseppe, and Selleri, Stefano

Subjects
*TRANSFORMATION optics, *COORDINATE transformations, *CLOAKING devices, *FILLER materials, *WAVEGUIDES
Abstract

This article applies a new method to analyze modes in empty waveguides having perfectly conducting walls and a rather generic cross‐section. The method is based on a coordinate transformation that maps the generic profile of the waveguide cross‐section to a circular waveguide (CW) filled with an anisotropic material. Modes in this latter waveguide can be represented as a series over the corresponding free‐space CW modes. This representation is particularly useful if used as a modal expansion over the port of a 2.5D or 3D device treated with a transformation optics approach. The method is particularly efficient when the waveguide is "similar" to a CW. Applications are shown to the analysis of some waveguides of arbitrary cross‐section with a view on practical applications. [ABSTRACT FROM AUTHOR]

Published
2021
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12. Sviluppo e progettazione di un sistema di movimentazione a carrelli magnetici

Author

Giannetti, Giacomo, thesis supervisor: Tani, Angelo, Giannetti, Giacomo, and thesis supervisor: Tani, Angelo

Abstract

La presente tesi riguarda lo sviluppo di un sistema automatico sulla base della tecnologia ACOPOStrak, un sistema di movimentazione innovativo e la metodologia del virtual commissioning per poter migliorare l'efficienza e l'affidabilità dei processi di automazione industriale. L’ACOPOStrak, noto per la sua flessibilità e capacità di gestire complessi flussi di lavoro, è stato implementato come parte di un sistema più ampio, il quale è stato soggetto a un approccio di virtual commissioning. La prima parte del lavoro si focalizza sull'analisi dettagliata delle caratteristiche e delle potenzialità dell'AcoposTrak permettendo lo sviluppo di un sistema di produzione industriale, sul quale sono state effettuate delle analisi di produttività per ottenere la configurazione di funzionamento ottimale. Successivamente, è stata implementata una strategia di virtual commissioning, permettendo la simulazione accurata del sistema automatizzato prima della sua effettiva implementazione fisica. Questo approccio ha fornito un ambiente virtuale per testare, ottimizzare e validare il sistema prima che entrasse in produzione. I risultati ottenuti indicano un significativo miglioramento nell'efficienza operativa, riduzione dei tempi di inattività, costi e aumento della precisione nel posizionamento degli shuttles. Inoltre, l'integrazione di tecniche di virtual commissioning ha dimostrato di ridurre i costi associati alle fasi di debug e test post-implementazione. Le conclusioni derivanti da questo lavoro possono essere utilizzate come base per ulteriori ricerche e implementazioni in contesti industriali diversificati.

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