Contribuição ao método iterativo das ondas para a análise de estruturas RSIW.

Abstract

In this thesis is presented a new formulation of the iterative wave method (WCIP), which is developed with based on the concept of auxiliary source and allows analyze circuits that contain metallic vias with varying heights. With this new modeling it is possible to apply the WCIP method in the study of structures with the RSIW (Ridge Substrate Integrated Waveguide) technology, considering that the geometry of RSIW structures has in its composition metallic vias and metallic posts that are inserted in the dielectric. In these structures, the posts have a lower height than the substrate and vias. In the modeling developed and presented in this thesis, two auxiliary sources are employed to represent the state of the cells that form the structure of the circuit‟s implemented using RSIW technology. The coupling between the two sources is realized in the modal domain. Therefore, we present the modeling that relates the dual quantities, the scattering and reflection parameters, and the iterative process. In addition, designs of bandpass filters, operating in the S band, with RSIW technology were developed. An interdigital RSIW cavity has been proposed to optimize the transmission parameter. These designs were simulated with HFSS and implemented on printed circuit boards. For the construction of the components was used FR4, and copper wires for metallization of the vias and silver paint to metalize the posts of the ridge. Finally, the components were subjected measurement to the laboratory to obtain the scattering parameters, thereby, the simulated and measured results were analyzed. Consistent results were verified between design, simulation and measurement. Therefore, the developed projects can be used for the validation of the developed modeling as soon as it is implemented in Matlab.