Spoof Surface Plasmon Polaritons Power Divider with large Isolation.

Area of Science:

• Electromagnetics and Wave Propagation
• Metamaterials and Plasmonics
• Microwave Engineering

Background:

• Spoof surface plasmon polaritons (SSPPs) offer unique waveguiding properties at microwave frequencies.
• Efficient manipulation and splitting of SSPPs are crucial for advanced microwave circuit design.
• Existing structures often face limitations in bandwidth, efficiency, or isolation.

Purpose of the Study:

• To design and demonstrate a novel periodic corrugated metal structure for SSPPs.
• To develop a high-efficiency, wideband plasmonic waveguide using oval-ring shaped cells.
• To construct a well-isolated power divider based on SSPPs waveguides for microwave applications.

Main Methods:

• Design of a plasmonic waveguide using periodic corrugated metal structures with oval-ring cells.
• Integration of coplanar waveguides (CPWs) for signal feeding and extraction.
• Co-design of stepped-impedances and a central resistor for impedance matching and port isolation in the power divider.

Main Results:

• The proposed plasmonic waveguide exhibits high transmission efficiency over a wide frequency range.
• The constructed power divider effectively splits SSPPs wave energy equally into two ports.
• Significant isolation between output ports is achieved from 4.5-7.5 GHz due to the integrated resistor.

Conclusions:

• The developed periodic corrugated metal structure effectively supports and propagates SSPPs.
• The designed plasmonic waveguide and power divider demonstrate promising performance for microwave applications.
• Experimental validation confirms the predicted characteristics, paving the way for future SSPPs-based devices.