研究目的
To design and demonstrate an ultra wide-stopband lowpass filter using smooth transmission line for improved stopband performance in microwave communication systems.
研究成果
The proposed filter demonstrates improved stopband performance with spurious responses suppressed up to 35 GHz, showing good agreement between simulation and measurement, and is promising for use in microwave and millimeter wave integrated circuits.
研究不足
The slight discrepancies between simulation and measurement are due to tolerances in fabrication. The method may require adjustments for different frequencies or materials.
1：Experimental Design and Method Selection:
The design involves transforming a lumped-element lowpass filter to a distributed filter using Richards transformation, with a modified stepped impedance structure based on a cosine-squared curve function to minimize discontinuities and improve stopband performance.
2：Sample Selection and Data Sources:
A 9th order Chebyshev lowpass filter prototype is used, with optimized lumped element values.
3：List of Experimental Equipment and Materials:
Microstrip lines with specific impedances (e.g., high-impedance lines at 136 Ohm, low-impedance lines at
4：6 Ohm and 5 Ohm) are fabricated. Experimental Procedures and Operational Workflow:
The filter is designed using CAD software, fabricated, and measured for S-parameters, with comparisons to simulation results.
5：Data Analysis Methods:
Simulation and measurement data are compared to validate performance, using standard microwave analysis techniques.
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