研究目的
To present a novel design of an eight-port directional coupler with a very compact structure and simple manufacturing, working in the Ku frequency band.
研究成果
A compact H-plane short-slot rectangular waveguide coupler with equal power division, with four-input and four-output ports at the Ku-band, was designed and fabricated by additive manufacturing technology in PLA with silver coating. The results showed the potential of the introduced structure for systems requiring distribution networks with a high number of ports.
研究不足
The manufacturing tolerances led to a deviation in the measured response, especially in Ports 3 and 7. The effective conductivity considered in the simulation was 2.3 MS/m, and the gap between the lid and the main body affected the performance.
1：Experimental Design and Method Selection:
The design was based on the short-slot topology for an H-plane eight-port directional coupler, utilizing a combination of 3D printing and silver coating metallization for fabrication.
2：Sample Selection and Data Sources:
The coupler was designed with standard rectangular waveguides (WR-51) for the Ku frequency band.
3：List of Experimental Equipment and Materials:
A 3D printer with Polylactic Acid (PLA biopolymer) material and silver coating for metallization were used.
4：Experimental Procedures and Operational Workflow:
The coupler was fabricated using additive manufacturing, followed by metallization with silver coating. Measurements were performed using a Keysight E5071C ENA series network analyzer.
5：Data Analysis Methods:
Full-wave analysis was conducted using in-house implementations of numerical methods like Mode-Matching (MM) and commercial software (CST Microwave Studio).
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