研究目的
To design a wideband high-temperature superconducting (HTS) filter using a novel coplanar spiral resonator structure (CSRS) that offers stronger coupling strength than conventional CPW structures, enabling low-frequency wideband filter applications.
研究成果
The CSRS enables the design of wideband HTS filters with strong coupling and excellent performance, including a 50% fractional bandwidth and minimal insertion loss. The structure's advantages over conventional CPW and microstrip designs are validated through simulation and measurement.
研究不足
The study focuses on low-frequency applications and may require further optimization for higher frequency bands. The fabrication process, while detailed, may present challenges in scaling or mass production.
1：Experimental Design and Method Selection:
The study introduces a novel CSRS for designing wideband filters, analyzing its coupling characteristics compared to conventional CPW structures. Full-wave electromagnetic simulation software Sonnet is used for simulations.
2：Sample Selection and Data Sources:
The filter is fabricated on a 500-nm-thick YBCO thin film deposited on a 0.5-mm-thick LaAlO3 substrate.
3：5-mm-thick LaAlO3 substrate.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Agilent 5072A vector network analyzer for measurements, standard photolithography and ion-beam etching for fabrication.
4：Experimental Procedures and Operational Workflow:
The filter design involves adjusting resonator parameters for enhanced coupling, followed by fabrication and measurement at 65K.
5：5K.
Data Analysis Methods:
5. Data Analysis Methods: Coupling coefficient and external quality factor are calculated to evaluate filter performance.
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