研究目的
To design a multi-layered dual-mode substrate integrated waveguide (SIW) bandpass filter (BPF) with input and output ports located on the same substrate layer, enabling flexible single- and dual-band filtering responses with controllable finite-transmission zeros (FTZs).
研究成果
The paper presents a feasible multi-layered dual-mode SIW BPF with IO ports on the same substrate layer, capable of flexible single- and dual-band responses with controllable FTZs. The measured results align well with simulations, demonstrating the filter's practical applicability.
研究不足
The presence of the dominant mode TE101 deteriorates the lower stopband performance, and high modes TE103, TE301, and TE202 deteriorate the upper stopband performance. The overall size of the dual-mode SIW cavity increases by 13.5% compared to two coupled TE101-mode-based SIW cavities.
1：Experimental Design and Method Selection:
The study employs a dual-extended doublet coupling scheme for the filter design, utilizing bypass couplings between source and load. The methodology involves the use of dual-mode SIW cavities coupled by two crossed slots for independent control of inter-couplings.
2：Sample Selection and Data Sources:
The research utilizes simulations and measurements of fabricated filters to validate the design approach. The substrate used has a relative dielectric constant of 2.2, thickness of 0.787 mm, and loss tangent of 0.
3：2, thickness of 787 mm, and loss tangent of List of Experimental Equipment and Materials:
0009.
3. List of Experimental Equipment and Materials: High-frequency structure simulator (HFSS) for simulation, substrate with specified properties, and standard fabrication techniques for the filters.
4：Experimental Procedures and Operational Workflow:
The design involves adjusting structure parameters to achieve desired filtering responses, followed by fabrication and measurement of the filters to compare with simulated results.
5：Data Analysis Methods:
The analysis includes comparing simulated and measured S-parameters, group delays, and the locations of FTZs to validate the filter's performance.
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