Publikationen

Within the project KERAMIS (Ceramic Microwave Circuits for Satellite Communications), which is funded by the German Ministry of Education and Technology, a consortium of six companies, research institutes and universities are developing ceramic based microwave circuits and modules for satellite applications. Examples of them are a Reconfigurable Switch Matrix and Hermetic Microwave Packages. - Our investigations are focused on developing, manufacturing and optimizing several types of broadband line transitions, different types of microwave interconnections to other modules or to the motherboard and matching networks and Filters. - Fodel® inks from DuPont were used to realize these multi-layer LTCC elements. Some of these elements include laser-structured micro-vias. - All line transitions and microwave interconnections are required to have a wide bandwidth and a very good impedance matching over the desired frequency range. The bandwidth limitations of the used arrangements depending on their geometrical properties was analyzed, evaluated and optimized and was applied to : - &hahog; design a LGA connection and a coplanar-embedded coplanar-coplanar line transition - &hahog; demonstrate the need for fine line structuring techniques, such us the well known Fodel® Technology, and micro vias when the modules are supposed to work at frequencies over 20 GHz (depending on the application) - 3D S-Parameter Simulations as well as S-Parameter measurements of all manufactured structures are going to be presented and explained.