研究目的
To propose a supercompact and ultrawideband (UWB) bandpass filter for spoof surface plasmonic polariton (SSPP) mode, reducing the electrical size dramatically compared to traditional structures.
研究成果
The proposed supercompact UWB bandpass filter based on SSPP waveguide, utilizing meander-line unit structures, demonstrates significant size reduction and wide bandwidth. The filter's performance, verified by experiments, shows good agreement with simulations, indicating potential applications in miniaturized microwave-integrated circuits.
研究不足
The adjustment of the low-frequency cutoff frequency is limited due to the way of capacitive coupling, which needs to be improved in future work.
1：Experimental Design and Method Selection
The methodology involves using meander-line technology to reduce the electrical size of the SSPP structure and constructing a supercompact UWB bandpass filter. The design rationale includes adjusting the upper cutoff frequency by changing the meander-line design and determining the lower cutoff frequency through capacitive coupling of the feeding structure.
2：Sample Selection and Data Sources
The samples include three different SSPP units (Units A-C) with varying designs to explore dispersion characteristics and surface current distributions. Data sources include simulations and experimental measurements.
3：List of Experimental Equipment and Materials
The equipment includes a vector network analyzer (Agilent N5230C) for measurements. Materials include Rogers RO4350B substrates with specific thicknesses and dielectric properties.
4：Experimental Procedures and Operational Workflow
The procedure involves designing SSPP units, simulating their dispersion curves and surface current distributions, constructing the bandpass filter, and measuring its performance. The workflow includes adjusting geometric parameters to control filter characteristics.
5：Data Analysis Methods
Data analysis involves comparing simulated and measured S-parameters, dispersion curves, and group delays to evaluate filter performance.
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