Síntese de uma nova tinta condutiva para circuitos de micro-ondas impressos sobre substrato de vidro e fibra de vidro

Abstract

This thesis describes the work carried out for the synthesis of new conductive ink, with a high concentration of silver particles, and its use is proposed as an alternative to the use of conventional techniques of manufacturing microwave integrated circuits. The importance of the use of conductive ink is associated with the ease, efficiency, versatility, and reduction of manufacturing costs of the integrated circuits, by using small brushes for the application on various dielectric materials. Research on the use of conductive ink has carried out in the development of microstrip antennas, bioinspired frequency selective surfaces (FSS), direct current blockers (DC blockers) and directional couplers. The simulation and the design of these circuits were performed with the software Ansys Designer and Ansys HFSS. The investigation of the behavior of frequency scattering parameters these circuits, which allowed the evaluation of aspects related to transmission, reflection, coupling, radiation and electromagnetic wave filtering. In order to validate the results of the simulations and to compare the experimental results, prototypes of these circuits with copper laminates and with surfaces painted were fabricated and measured. The good agreement observed between the simulated and measured results for the prototypes of microwave integrated circuits painted with silver ink confirms the efficiency and versatility of the printing procedure with the use of the synthesized conductive ink.