研究目的
Designing a compact dual-band branch-line coupler for mobile phone applications using multilayer PCB technology to achieve size reduction and high isolation with flexible frequency ratio.
研究成果
The compact dual-band branch-line coupler designed in this study achieves significant size reduction (over 90%) and operates efficiently at 2.4/3.5 GHz with a 2 dB power division ratio. Its design advantages include arbitrary power division ratio, flexible operating frequencies, and aligned phase differences, making it suitable for microwave systems and wireless communication.
研究不足
The study focuses on a specific frequency range (2.4/3.5 GHz) and power division ratio (2 dB), which may limit its applicability to other frequencies or ratios without further optimization.
1：Experimental Design and Method Selection:
The study employs multilayer PCB technology and miniaturization units to design a compact dual-band branch-line coupler. Theoretical models and optimization techniques are used for design and verification.
2：Sample Selection and Data Sources:
The coupler is designed to operate at 2.4/3.5 GHz, with parameters calculated based on theoretical expressions and optimized for physical requirements.
3：4/5 GHz, with parameters calculated based on theoretical expressions and optimized for physical requirements.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Rogers3010 substrate with εr=3 and tanδ=0.003 is used. The design involves microstrip lines and strip-line structures.
4：003 is used. The design involves microstrip lines and strip-line structures.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The coupler is simulated and optimized using ADS Momentum, with physical parameters listed for replication.
5：Data Analysis Methods:
Simulated S-parameters and phase differences are analyzed to verify the coupler's performance.
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