Contribution à la conception de structures et dispositifs passifs en guide d’onde intégré au substrat.

Abstract

In recent years, modern technological developments in the field of telecommunications and the use of increasingly high frequencies leading to the design of increasingly miniaturized circuits and devices have prompted investigations for more and more efficient technologies. The substrate integrated waveguide technology is currently the most promising avenue as an alternative to passive planar devices. SIWs offer the advantage of eliminating radiation losses, and significantly reducing insertion losses, and improving the quality factor. The production costs are low, consumer substrates such as FR4 or LTCC printed circuit boards are suitable for the implementation of SIWs, which therefore have better quality/price ratios. In this thesis, the work is directed towards the proposal of new efficient techniques for the design, optimization, realization and adjustment of microwave filters that overcome the limitations of existing techniques. More concretely, our contributions will revolve around two components: In the first part, we were interested in the design of compact and high-performance SIW wide-bandpass filters, for high-speed applications, in particular for 5G applications. Based on the technique of multimode resonators, new SIW filters broadband have been developed. This technique solves the size and integration problems of current filters while maintaining equivalent electrical performance. In the second part, to reduce the volume of communication systems, a new approach to design a SIW filter tunable in central frequency and bandwidth with a good quality factor, easy integration and a wide tuning range is proposed.