Projeto e análise de circuladores não recíprocos para radares automotivos em ondas milimétricas

Abstract

This work presents the design, modeling, and analysis of non-reciprocal circulators operating in the 76–81 GHz frequency range, targeting applications in high-performance automotive radar systems. Employing Strontium Hexaferrite (SrFe12O19) as the ferritic material, 3-port, 4-port, and 6-port circulators were designed and simulated in a microstrip configuration. lectromagnetic simulations were performed using CST Microwave Studio (FDTD) and Ansys HFSS (FEM) software for results validation. The S-parameter analysis consistently demonstrated insertion losses below 0.8 dB and isolations exceeding 25 dB for the proposed designs, indicating the promising potential of the approach for 77 GHz applications. Additionally, the research addresses the impact of strontium hexaferrite properties on circulator performance and discusses the relevance of geometric precision for the fabrication of these devices at high frequencies. This study contributes to the development of more advanced automotive radar technologies by providing efficient and scalable solutions for signal routing and isolation in complex radar systems operating at 77 GHz.