Development of a Ku-band filter

The article is devoted to the comprehensive development of a dual-mode waveguide filter for the Ku-band, featuring an elliptic amplitude-frequency response. The relevance of the work is driven by the growing requirements for satellite communication equipment, such as increased selectivity, reduced mass and size, lower passband losses, and ensuring group delay flatness. The work details the fundamental advantages of the dual-mode waveguide filter compared to classical single-mode counterparts, the chief among them being the ability to achieve high selectivity with half the number of resonators. The design method based on the application of modern computer-aided design systems is described: CST Filter Designer for coupling matrix synthesis and initial analysis, Fest3D for accelerated electromagnetic synthesis, and CST Studio Suitе for final modeling and optimization of the filter geometry. The simulation results for a fifth-order dual-mode waveguide filter are presented, confirming that its characteristics meet the specified requirements. The effectiveness and simplicity of the proposed methodology are demonstrated, as well as the high accuracy of the correlation between the simulated and experimental data. The developed filter shows high potential for application in advanced satellite communication systems.