研究目的
To design an E-plane Rotman-lens for a two-dimensional multi-beam antenna using multi-layer substrate integrated waveguide in the millimeter-wave band and evaluate its E-plane beam-forming performance.
研究成果
The E-plane beam-forming performance was successfully evaluated using array factors derived from simulated S-parameters, achieving a scan angle of approximately 30 degrees in the E-plane, which confirms the feasibility of the designed Rotman-lens for millimeter-wave applications.
研究不足
The total substrate thickness was limited to 5mm due to fabrication facility constraints. The scan angle was approximately 30 degrees, and deviations from design beam-directions were observed (e.g., +28.5 degrees instead of +30 degrees).
1：Experimental Design and Method Selection:
The study involved designing an E-plane Rotman-lens with five input and output ports in a five-layer substrate using substrate integrated waveguide (SIW) technology. The design rationale was to achieve beam-forming for millimeter-wave communication systems. Theoretical models included the Rotman-lens phase shifter principles. Methods involved electromagnetic simulation to obtain S-parameters and calculation of array factors.
2：Sample Selection and Data Sources:
The sample was the designed E-plane Rotman-lens structure. Data sources were simulated S-parameters from electromagnetic simulations.
3：List of Experimental Equipment and Materials:
Substrate with dielectric constant of 2.81, thickness of 1mm per layer, total thickness limited to 5mm. Metal patterns etched between substrates. No specific equipment brands or models mentioned.
4：81, thickness of 1mm per layer, total thickness limited to 5mm. Metal patterns etched between substrates. No specific equipment brands or models mentioned.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Designed the lens with specific input and output contours (radii 4.0mm and 7.3mm), target scan angle from -30 to +30 degrees, design frequency 79GHz. Simulated the S-parameters, extracted output amplitude and phase, and calculated normalized array factors for beam directions.
5：0mm and 3mm), target scan angle from -30 to +30 degrees, design frequency 79GHz. Simulated the S-parameters, extracted output amplitude and phase, and calculated normalized array factors for beam directions.
Data Analysis Methods:
5. Data Analysis Methods: Array factors were calculated from simulated S-parameters to evaluate beam-forming performance and scan angles.
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