The goal was to be able to manufacture small robust coils with complex geometries and improved signal output.Ī crucial element for its performance is the quality factor of the embedded coil. The purpose of this paper is a presentation of eddy current sensing coils for the turbo charger speed measurement, which were manufactured with the Low Temperature Co-fired Ceramic (LTCC) technology. This work presents an entirely additive manufacturing-based approach to fabricate electronic components including substrates, interconnects, and RF elements for high temperature applications. It was found that the dielectric loss increased as the temperature increased. The substrate dielectric constant slightly increased for temperatures up to 450☌ and significantly increased for temperatures between 450☌ - 750☌. The printed gold structures showed excellent stability and adhesion after aging at temperatures up to 750☌. A 3D printed conformal broadband antenna was successfully fabricated and tested at temperatures up to 850☌. Furthermore, the microwave dielectric constant and loss tangent of the alumina substrate were extracted through measurements of the scattering parameters of transmission lines up to 750☌. The gold ink printability and its adhesion to the ceramic substrate were assessed. An aerosol jet printing technique that can deposit an ink stream down to 10 µm was utilized to fabricate gold-based electronic structures. The substrate is alumina-based with a purity level of 99.8% and was fabricated through photopolymerization digital light processing (DLP). Here, the electronic system is represented by gold-based electrical structures that have been printed on 3D printed ceramic substrates. The current work presents a major advancement toward development of additively printed electronics made for high temperature applications. There is a rapidly growing interest in the development of electronics microsystems that can maintain functionality in high temperature environments, particularly in power generation and aircraft engines where the operating temperatures can exceed 500☌.
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