研究目的
Investigating the design and performance of a novel dual-band substrate integrated waveguide (SIW) ?lter with high selectivity and good out-of-band rejection performance.
研究成果
The proposed SIW cavity is a candidate for the design of compact planar dual-band filters. Filter III exhibits an excellent out-of-band rejection performance with the first and second transmission zeros independently controlled to desired values by tuning the dimensions of open loop resonators. All of the filters are fabricated on a 0.508 mm-thickness F4B substrate based on the proposed SIW cavity.
研究不足
The measured in-band return losses are 5～10 dB smaller than the simulation ones. The center frequencies have a relative offset to higher frequency, and the bandwidths of the first passband are larger than that of the simulation while the second passbands are nearly the same. The unsatisfactory return loss may be attributed to slight impedance mismatch between the feeding section and the SMA connectors caused by manual welding and the effective conductivity of fabricated filters which is less than that of the simulation.
1：Experimental Design and Method Selection:
The design involves an orthogonal input/output (I/O) feeding structure connected to the SIW cavity to split resonant frequencies of degenerate modes. The filter is modeled with a multi-path circuit formed by three modes (TE101, TE201, and TE102) and weak cross coupling between I/O ports.
2：Sample Selection and Data Sources:
Several filter prototypes are designed and fabricated for demonstration. The performance is validated using measured results.
3：List of Experimental Equipment and Materials:
A 0.508 mm thick Rogers 5880 substrate is used with a relative permittivity of 2.2 and dielectric loss tangent of 0.0009. The diameter of the vias is 1 mm, and the space between two vias is 1.5 mm.
4：508 mm thick Rogers 5880 substrate is used with a relative permittivity of 2 and dielectric loss tangent of The diameter of the vias is 1 mm, and the space between two vias is 5 mm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The filters are analyzed and designed using full-wave EM simulator software (Ansoft HFSS). The fabricated filters are measured using an Agilent 8722ES network analyzer.
5：Data Analysis Methods:
The simulated and measured frequency responses are compared to validate the design and analysis.
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