Synthesis methods for multilayer substrate integrated waveguide filters in the context of 5G communication systems

This thesis aims to explore a new method for the dimensioning and the design of passive RF Filters in mm frequency (Ka-Band, above 27 GHz). This Ka-band has been mostly unemployed for several good reasons, but the demand for 5G networks, and consequently for higher Data Rate performances, has brought new interest in it. The design of an RF filter in a multilayer PCB SiW technology will provide an interesting example of the procedure that will be presented step by step. This device has to be integrated into massive MIMO System for a 5G BS (Base Station). The implemented filter is of all poles type thus to have the minimum possible topological complexity and the more straightforward possible manufacturing process. As we will see these are vital characteristics given the large tolerances of the technologies used in the example provided here. Techniques of synthesis based on optimization or intensive use of EM (Electromagnetic) FEM (Finite Element Method) are sometimes very useful or even indispensable when dealing with a project like these, ambitious from a technological standpoint of view and for band and bandwidth specs. The main difficulty to overcome is to engine a way to model the charging effect in the resonators, and to address how the dispersion affects the behavior of the single aperture in the structure. The accuracy of the developed procedure has been verified via EM Monte Carlo Simulation.

lo scopo di questa tesi è esplorare un nuovo metodo di dimensionamento di un Filtro RF passivo nella banda SHF. Questa banda EM è stata grandemente sottoimpiegata per diverse rafioni ma la domanda per reti di quinta generazione e di conseguenza per performance maggiori di Data rate ha portato nuovo interesse in essa.Il progetto di un filtro RF in tecnologia PCB SIW fornirà un interessante esempio della nuova procedura che verrà presentata passo per passo. Questo dispositivo deve essere integrato in un massive mimo system per una Stazione base di quinta generazione.