Advanced Design and Fabrication of Microwave Components Based on Shape Optimization and 3D Ceramic Stereolithography Process

International audienceThe design of advanced components for space and terrestrial telecommunication systems requires both sophisticated design methodologies and manufacturing technologies for improving current component characteristics. In particular, optimizing the shape and the size of a component is a problem of primary importance for microwave engineers. Moreover, for designing RF and microwave components or antennas, the use of ceramic materials is preferable in order to satisfy both electrical and dimensional constraints. The main objective of this chapter is to demonstrate that it is possible to jointly improve the design and fabrication procedures of ceramic based advanced RF components. In this context, a ceramic 3D stereolithography based rapid prototyping technique is applied for fabricating 3D ceramic structures. As presented next, theoretical and experimental approaches are complementary and innovative components with excellent electrical performances have been designed, manufactured and characterized. Then the contribution demonstrates how an original CAD design approach based on shape optimization methods can be applied for improving electrical performance and integration of microwave and millimeter-wave devices

Mesures multiports de dispositifs passifs par analyseur de réseaux 4 ports

Dans cet article, la démarche est de proposer des activités de travaux pratiques et de projet sur la mesure de composants multipôles de Front End tels que les ponts diviseurs de Wilkinson et les circulateurs, en utilisant des analyseurs de réseaux 4 ports qui permettent une mesure vectorielle simultanée de la réponse fréquentielle en réflexion de chaque port et en transmission entre chaque port et des procédures de de-embedding des mesures

Pulsed-field array performance: A TD analysis

The pulsed-field excited array antenna performance is studied via full time-domain instruments. The directional distribution of radiated energy and the directional (system) fidelity factor are employed as performance metrics. Illustrative numerical experiments highlight the expedient radiation features that are specific to pulse-train excited, linear array antennas. The analysis provides an expedient reference for estimating the detectability of the signals radiated by pulse-train excited array antennas, as needed in ultra-high rate wireless digital transfer