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Continuously tunable low-loss phase shifter using weak-dispersion spoof surface plasmon polaritons.
Optics Letters
|December 13, 2024
Summary
We developed a low-loss phase shifter using weak-dispersion spoof surface plasmon polariton (SSPP) waveguides. This tunable device achieves significant phase shifts with minimal insertion loss, outperforming traditional designs.
Area of Science:
- Electromagnetics
- Metamaterials
- Photonics
Background:
- Traditional spoof surface plasmon polariton (SSPP) devices often suffer from high insertion loss due to reliance on strong-dispersion properties.
- Minimizing insertion loss is crucial for practical applications of SSPP-based devices.
Purpose of the Study:
- To propose and demonstrate a continuously tunable, low-loss phase shifter.
- To leverage the weak-dispersion region of SSPP waveguides for improved performance.
Main Methods:
- Investigated the relationship between waveguide length, phase shift, and insertion loss in weak-dispersion SSPP structures.
- Designed an active SSPP unit by integrating a varactor diode for continuous phase tuning.
- Fabricated and experimentally validated the proposed phase shifter design.
Main Results:
- Achieved continuous phase shifts up to 258 degrees at 8.5 GHz.
- Demonstrated exceptionally low insertion loss, below 0.016 dB per degree.
- The proposed weak-dispersion SSPP phase shifter shows superior performance compared to traditional designs.
Conclusions:
- Weak-dispersion SSPP waveguides offer a promising approach for developing high-performance, low-loss phase shifters.
- The integrated varactor enables continuous and efficient phase tuning.
- This technology has significant potential for advanced microwave and photonic systems.
