研究目的
To design and develop a wide-band filtering three-port coupler with inherent DC-blocking function for applications in wideband communication systems, featuring improved bandwidth, filtering performance, and isolation.
研究成果
The proposed wide-band filtering three-port coupler with inherent DC-blocking function demonstrates a 49% bandwidth with excellent filtering performance, high isolation, and good agreement between simulation and measurement. It is suitable for applications in multi-feed circularly polarized antennas and modern wireless communication systems, offering advantages in miniaturization and integration.
研究不足
The coupler's performance may be affected by junction discontinuities and fabrication tolerances, and while it offers wide bandwidth and filtering, further optimization could enhance isolation and stopband rejection. The design is specific to microwave frequencies and may not be directly applicable to other frequency ranges without modification.
1：Experimental Design and Method Selection:
The coupler is designed using a combination of a wideband filtering power divider and a wideband coupled-line phase shifter. Theoretical analysis involves even-/odd-mode analysis to derive S-parameters and optimize circuit parameters.
2：Sample Selection and Data Sources:
A prototype operating at 3 GHz is designed, simulated using Advanced Design System (ADS) software, fabricated on a Rogers RO4350B substrate, and measured using a vector network analyzer.
3：List of Experimental Equipment and Materials:
Substrate (Rogers RO4350B with dielectric constant
4：48, thickness 524 mm, loss tangent 0037), vector network analyzer (ROHDE&SCHWARZ ZVA8), and lumped resistors. Experimental Procedures and Operational Workflow:
The circuit is designed with specific impedances and dimensions, simulated in ADS, fabricated as a PCB, and measured for S-parameters and phase difference.
5：Data Analysis Methods:
S-parameters and phase differences are analyzed to evaluate bandwidth, return loss, isolation, and filtering performance, with comparisons to simulations and other referenced works.
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