研究目的
Investigating the design and performance of a substrate integrated waveguide Butler matrix with a modi?ed hybrid coupler for slot antenna array applications in 5G mmWave wireless communications.
研究成果
The designed Butler matrix with a modi?ed hybrid coupler exhibits excellent performance with wideband and ?at phase balance, facilitating the design ?exibility of Butler matrices. The slot array fed by the Butler matrix can radiate four slanted beams with acceptable measured gains and a wide azimuthal coverage between ±61?, making it an attractive candidate for 5G mmWave communications.
研究不足
The design may occupy a larger area compared to traditional Butler matrices, and the feeding ports are distributed across two different locations, which may not be suitable for all scenarios such as mobile terminals.
1：Experimental Design and Method Selection:
The study involves the design of a substrate integrated waveguide (SIW) Butler matrix with a modi?ed hybrid coupler, operating from 28 to 32 GHz. The modi?ed hybrid coupler is realized by combining a 90? hybrid coupler with a ?45? compensating phase shifter to achieve 45?/135? output phase differences.
2：Sample Selection and Data Sources:
The design is implemented on Rogers Duroid 5880 substrate with specific thickness, loss tangent, and relative dielectric permittivity. All components are optimized using the full-wave FEM simulation package, Ansoft HFSS ver.
3：List of Experimental Equipment and Materials:
Rogers Duroid 5880 substrate (thickness of 0.508 mm, loss tangent of 0.0009, relative dielectric permittivity of 2.2), Ansoft HFSS ver. 15 for simulation.
4：508 mm, loss tangent of 0009, relative dielectric permittivity of 2), Ansoft HFSS ver. 15 for simulation.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The design process includes the realization of a 90? hybrid coupler, the design of a ?45? compensating phase shifter, and the integration of these components into a modi?ed hybrid coupler. The performance of the Butler matrix is then evaluated through simulation and measurement.
5：Data Analysis Methods:
The performance of the Butler matrix and the slot array antenna is analyzed based on S-parameters, output phase differences, radiation patterns, and gain measurements.
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