研究目的
To design a high-temperature superconducting bandpass filter based on split ring resonator structures for compact and high-performance microwave applications.
研究成果
The designed HTS filter based on SRR structures operates at 2.515GHz with low insertion loss (0.1dB) and good selectivity (rectangle coefficient 1.22), showing agreement between simulation and measurement, confirming SRR's suitability for HTS filter applications.
研究不足
Potential frequency shifts due to differences in substrate permittivity values and fabrication tolerances; the filter is designed for specific frequencies and may not be easily scalable or tunable.
1：Experimental Design and Method Selection:
The filter was designed using an eight-pole prototype with SRR structures to achieve good skirt selectivity and compact size. Theoretical models and coupling matrix methods were employed for design optimization.
2：Sample Selection and Data Sources:
A YBCO thin film on an MgO substrate was used, with specific dimensions and material properties.
3：List of Experimental Equipment and Materials:
YBCO thin film, MgO substrate (εr=
4：78, thickness 5 mm, loss tangent 4e-4), Sonnet software for simulation, CST software for initial design, Agilent N5244A PNA-X Network Analyzer for measurements. Experimental Procedures and Operational Workflow:
The filter was simulated using Sonnet software with dielectric and conductor losses considered. It was fabricated and tested at 70K using the network analyzer to measure S11 and S21 parameters.
5：Data Analysis Methods:
Data were analyzed to determine center frequency, fractional bandwidth, rectangle coefficient, return loss, and insertion loss, with comparisons to simulated results.
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