研究目的
To design a compact third-order SIW LTCC ?lter with improved lower stopband performance using TE201-mode and TE101-mode for negative cross coupling and bypass coupling, respectively.
研究成果
A compact third-order SIW LTCC ?lter with improved lower stopband performance was successfully designed and fabricated. The use of TE201-mode and TE101-mode in the folded-SIW cavity allowed for the introduction of three transmission zeros below the passband, improving stopband attenuation and achieving better spurious suppression performance.
研究不足
The slight shift of central frequency due to large shrink of SIW cavities and the need for precise adjustment of coupling coefficients to achieve desired transmission zeros.
1：Experimental Design and Method Selection:
Utilized TE201-mode in folded-SIW cavity for negative cross coupling and TE101-mode as a non-resonating node (NRN) for bypass coupling. A circular aperture etched on the middle metal layer was used for coupling between source and the second SIW cavity.
2：Sample Selection and Data Sources:
Designed and fabricated a ?lter sample using multi-layer LTCC technology.
3：List of Experimental Equipment and Materials:
LTCC substrate with relative permittivity of 5.9, loss tangent of 0.0025, and thickness of 0.096 mm per layer. Via-hole diameter of 0.174 mm.
4：9, loss tangent of 0025, and thickness of 096 mm per layer. Via-hole diameter of 174 mm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Simulated using High Frequency Structure Simulator (HFSS). Fabricated the ?lter and measured S-parameters.
5：Data Analysis Methods:
Compared measured S-parameters with simulated ones to validate the design.
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