研究目的
To introduce a sharp compact stopband filter based on unbalanced dual composite right left handed D-CRLH unit cell for suppressing undesired signals in WLAN frequencies and applications in C-band.
研究成果
A sharp bandstop filter based on D-CRLH unit cell has been successfully designed and implemented, demonstrating a sharp stopband at C band with a transmission coefficient below -30 dB at 4 GHz and a 3 dB bandwidth extending from 3 GHz to 5 GHz. The filter's compact size and performance have been confirmed through circuit model, 3D electromagnetic simulation, and practical measurements.
研究不足
The filter response is affected by substrate losses, and the equivalent circuit was assumed lossless which may not fully represent practical scenarios.
1：Experimental Design and Method Selection:
The filter design is based on D-CRLH unit cell configuration, utilizing image parameter method and insertion loss method to determine cutoff frequencies.
2：Sample Selection and Data Sources:
The filter is designed for WLAN frequencies and C-band applications.
3：List of Experimental Equipment and Materials:
FR4 substrate with relative dielectric permittivity of
4：4 and thickness of 6 mm. Experimental Procedures and Operational Workflow:
The filter was synthesized using a patch capacitor, microstrip inductor, and an air gap capacitor, followed by full wave simulation and practical measurements.
5：Data Analysis Methods:
The filter response was analyzed using circuit model, 3D electromagnetic simulation, and practical measurements.
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