研究目的
Investigating the use of liquid metal for continuous tuning of a bandpass filter with a wide tuning range.
研究成果
The study successfully demonstrates a continuously tunable second order bandpass filter using liquid metal, showing a wide tuning range and good agreement between simulation and measurement. This tuning mechanism is promising for future frequency-agile filter applications.
研究不足
The manual injection method limits the precision of tuning individual resonator poles. The prototype does not deploy variable couplings, affecting bandwidth consistency across the tuning range.
1：Experimental Design and Method Selection:
The study employs square substrate integrated waveguide cavity resonators, capacitively loaded with liquid metal posts. The height of these posts is adjusted to tune the resonant frequencies.
2：Sample Selection and Data Sources:
A second order bandpass filter is designed and measured to validate the concept.
3：List of Experimental Equipment and Materials:
The setup includes a calibrated N5225A vector network analyzer, Rogers TMM3 substrate, and Galinstan liquid metal.
4：Experimental Procedures and Operational Workflow:
The liquid metal is injected into the cavity vias to form posts, whose height is adjusted to tune the filter. Measurements are conducted to assess performance.
5：Data Analysis Methods:
The frequency responses of the devices are analyzed to confirm tunability and performance.
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