研究目的
To design and verify a four-way spoof surface plasmon polariton (SSPP) splitter/combiner with oval-ring periodic structures for high-efficiency conversion and equal division of electromagnetic waves in microwave and terahertz ranges.
研究成果
The proposed four-way SSPP splitter/combiner successfully achieves equal division of electromagnetic waves into four paths with high efficiency and ultra-wide bandwidth. It has potential applications in microwave integrated circuits and wireless communication systems, facilitating further development of SSPP-based components.
研究不足
The difference between simulated and measured results (about 1 dB for some parameters) is attributed to fabrication tolerances and metal roughness. The design is limited to microwave and terahertz frequencies and may require optimization for other applications.
1：Experimental Design and Method Selection:
The design involves a four-way SSPP splitter/combiner using a single coplanar waveguide (CPW) connection junction with oval-ring periodic structures. The dispersion curves were calculated using the eigenmode solver in CST software to analyze wave propagation.
2：Sample Selection and Data Sources:
A fabricated circuit on a printed circuit board with copper material and a substrate of relative permittivity
3：55 was used. List of Experimental Equipment and Materials:
Equipment includes CST software for simulation, Agilent N5230A vector network analyzer for measurements, SubMiniature version A connectors, and 50-ohm matching loads. Materials include copper (thickness
4：017 mm) and substrate (thickness 8 mm, relative permittivity 55). Experimental Procedures and Operational Workflow:
The circuit was fabricated and connected to connectors. S-parameters were measured by connecting ports to the vector network analyzer and loads, with near-field distributions simulated in CST.
5：Data Analysis Methods:
S-parameters and near-field distributions were analyzed to assess performance, including insertion loss, bandwidth, and power division equality.
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