研究目的
Designing a high temperature superconducting dual-band filter with multiple transmission zeros to achieve controllable central frequencies, bandwidths, and improved out-of-band rejection.
研究成果
The designed HTS dual-band filter successfully achieves controllable center frequencies, bandwidths, and multiple transmission zeros, leading to excellent selectivity and out-of-band suppression (up to 80dB). The measured results align well with simulations, demonstrating the effectiveness of the proposed methods for advanced microwave filter applications.
研究不足
The fabrication errors in the circuit and film-making process may cause small differences between simulated and measured results. The performance is temperature-dependent, with insertion losses increasing above 83K due to loss of superconductivity.
1：Experimental Design and Method Selection:
The paper uses theoretical analysis of electric and magnetic mixed coupling and cascade quadruplet cross-coupling structures to introduce transmission zeros. A Y-shape folded tunable resonator is designed for dual-band operation with independent control of frequencies and bandwidths. Full-wave simulations are conducted to analyze current distributions, coupling coefficients, and external quality factors.
2：Sample Selection and Data Sources:
The filter is fabricated on double-sided YBCO/MgO/YBCO high temperature superconducting thin films with specific dimensions (17.2mm×14.7mm, thickness 0.5mm, dielectric constant 9.8). Data is sourced from electromagnetic simulations and measurements using a vector network analyzer at 77K.
3：2mm×7mm, thickness 5mm, dielectric constant 8). Data is sourced from electromagnetic simulations and measurements using a vector network analyzer at 77K.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a vector network analyzer for measurements. Materials include YBCO/MgO/YBCO HTS thin films, MgO substrate, and photolithography/ion etching tools for fabrication.
4：Experimental Procedures and Operational Workflow:
The resonator dimensions (e.g., h1, h2) are adjusted to control resonant frequencies. Coupling distances (e.g., d1, d2) are varied to achieve desired coupling coefficients. External quality factors are tuned using tapped line structures. The filter is fabricated, packaged, and measured at cryogenic temperatures.
5：Data Analysis Methods:
Coupling coefficients are calculated using frequency peak separations. External quality factors are extracted from 3-dB bandwidths. Roll-off ratios are computed based on attenuation levels. Simulation and measurement results are compared for validation.
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