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An ultra-compact rejection filter based on spoof surface plasmon polaritons
Shumin Zhao1,2, Hao Chi Zhang3, Jiahao Zhao4
1Beijing Innovation Center for Future Chip, State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, P.R. China.
Scientific Reports
|September 7, 2017
Summary
We developed ultra-compact rejection filters using split-ring resonators (SRRs) on spoof surface plasmon polariton (SPP) transmission lines. These filters demonstrate excellent performance, achieving high isolation for microwave and terahertz applications.
Area of Science:
- Electromagnetics and Photonics
- Metamaterials Engineering
Background:
- Spoof surface plasmon polaritons (SPPs) offer unique waveguiding properties at lower frequencies.
- Conventional filters can be bulky, limiting integration in compact devices.
- Metamaterials, such as split-ring resonators (SRRs), enable novel electromagnetic responses.
Purpose of the Study:
- To propose and analyze a novel ultra-compact rejection filter design.
- To investigate the filtering mechanism enabled by loading SRRs onto SPP transmission lines.
- To experimentally validate the performance of the proposed filter design.
Main Methods:
- Theoretical analysis using dispersion relations of SPP transmission lines with and without SRR loading.
- Fabrication of two SPP waveguides with varying amounts of metamaterial loading.
- Experimental testing using a Vector Network Analyzer (VNA) and a near-field scanning system.
Main Results:
- Dispersion analysis revealed the mechanism behind the filter's rejection characteristics.
- Simulated and measured results showed excellent agreement, validating the theoretical model.
- The fabricated filters demonstrated high isolation, below -20 dB, reaching -40 dB at rejection frequencies.
Conclusions:
- The proposed SRR-loaded SPP transmission line is an effective method for creating ultra-compact rejection filters.
- The design exhibits excellent filtering characteristics with high isolation.
- This technology holds significant potential for developing integrated plasmonic devices and circuits for microwave and terahertz frequencies.
