研究目的
To propose a widely tunable bandpass filter using a novel fully tunable resonator to achieve a wider tuning range and better suppression performance compared to traditional tunable filters.
研究成果
The proposed widely tunable bandpass filter with novel fully tunable resonators achieves an 86.5% frequency tuning range, low insertion loss, and excellent suppression performance, outperforming traditional designs. It demonstrates the feasibility of independent tuning of center frequency, external Q, and coupling coefficients, suggesting potential for improved communication systems.
研究不足
The insertion loss is less than 2 dB but could be affected by dielectric substrate losses; the tuning range and performance might be limited by the varactor diodes' characteristics and design complexities.
1：Experimental Design and Method Selection:
The design involves a novel fully tunable resonator derived from step impedance lines, incorporating an open ring, frequency tuning structure (using capacitor Cf), and coupling tuning structure (using capacitors Cc). The filter is designed with five such resonators to achieve wide tunability and suppression.
2：Sample Selection and Data Sources:
A specific tunable bandpass filter operating in 210-530 MHz range is designed and fabricated.
3：List of Experimental Equipment and Materials:
Substrate Rogers 4350B, varactor diodes Ma46H202 from MACOM Technology, large inductors for bias, and simulation tools like HFSS.
4：Experimental Procedures and Operational Workflow:
The resonator sizes are determined based on operating range; feed positions and slots are designed; varactor diodes are loaded; fine adjustments are made; simulation with HFSS and measurement with RS ZVB4 network analyzer are performed.
5：Data Analysis Methods:
Comparison of simulated and measured frequency responses, insertion loss analysis, and performance benchmarking against other filters.
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