研究目的
To design and analyze a compact band-stop filter using a complementary split ring resonator, develop an equivalent circuit model with a simplified mathematical approach for parameter extraction, and study the effects of dimensional variations on filter characteristics.
研究成果
A compact CSRR-based band-stop filter was successfully designed, simulated, and fabricated, achieving suppression at 2.4 GHz. The equivalent circuit model, using only three lumped elements, closely approximates the filter behavior. Parametric analysis showed frequency tuning capability by varying CSRR dimensions. Measured results align well with simulations, though improvements are needed for high-frequency performance.
研究不足
The equivalent circuit model assumes a lossless system, leading to minor mismatches in impedance due to unaccounted losses. The high-frequency passband shows large reflections that could be improved. Ripples in measured results may be due to cable losses.
1：Experimental Design and Method Selection:
The study involves designing a band-stop filter using a CSRR etched on the ground plane of a microstrip transmission line. An equivalent circuit model is derived based on simulated S-parameters and impedance characteristics. A stepwise mathematical approach is used to extract circuit parameters from simulation results.
2：Sample Selection and Data Sources:
The filter is designed on an FR-4 substrate with specific dimensions. Simulation data (S-parameters and impedance) are obtained using CST software.
3：List of Experimental Equipment and Materials:
FR-4 substrate (dielectric constant
4：3, thickness 6 mm), microstrip line, CSRR structure. For fabrication and measurement:
vector network analyzer (Keysight N9914A).
5：Experimental Procedures and Operational Workflow:
Design the filter geometry in CST Microwave Studio, simulate to obtain S-parameters and impedance curves, extract circuit parameters mathematically, fabricate the filter, and measure performance using a vector network analyzer.
6：Data Analysis Methods:
Analyze S-parameters (reflection and transmission coefficients) and impedance curves. Use mathematical equations to derive lumped element values (inductance, capacitance) for the equivalent circuit. Compare simulated, circuit-simulated, and measured results.
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