研究目的
To present and validate a compact leaky-wave antenna using a planar spoof surface plasmon polariton (SSPP) structure, focusing on achieving high radiation efficiency and wide beam scanning with a small number of radiation units.
研究成果
The SSPP leaky-wave array antenna demonstrates compact footprint and good radiation performance, with a beam scanning range from 0° to 51° in the E-plane from 5 to 7.5 GHz. The prototype achieves a radiation gain greater than 11.5 dBi from 5.8 to 6.8 GHz, validating the SSPP technique for microwave leaky-wave antenna applications. Future work could focus on optimizing for lower loss substrates and broader frequency ranges.
研究不足
The use of a lossy FR-4 substrate may introduce higher dielectric losses compared to low-loss substrates like Rogers5880. Fabrication imperfections and dielectric constant tolerances can cause discrepancies between simulated and measured results. The design is validated for a specific frequency range (5.5-7.5 GHz) and may not be optimized for other bands.
1：Experimental Design and Method Selection:
The design involves using SSPP techniques to create a leaky-wave antenna. A diamond SSPP unit is proposed for the feeding network and radiation elements. The methodology includes theoretical analysis of surface impedance modulation and dispersion curves to switch between confinement and radiation modes. Full-wave simulations using HFSS are employed for design optimization.
2：Sample Selection and Data Sources:
A prototype antenna is fabricated on an FR-4 substrate. The design includes a 4x4 array of SSPP radiation units and a feeding network with a four-way SSPP power-divider. Data is sourced from simulations and measurements of the fabricated prototype.
3：List of Experimental Equipment and Materials:
Equipment includes a vector network analyzer (VNA) for S-parameter measurements and a microwave chamber for radiation pattern measurements. Materials include an FR-4 substrate (thickness 0.254 mm, relative dielectric constant 4.4, loss tangent 0.02) and copper for the conductive patterns.
4：254 mm, relative dielectric constant 4, loss tangent 02) and copper for the conductive patterns.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The prototype is fabricated using printed-circuit-board technology. Measurements involve reflection coefficient (S11) using a VNA and radiation patterns in a microwave chamber. Simulations are conducted with HFSS to compare with measured results.
5：Data Analysis Methods:
Data analysis includes comparing simulated and measured S-parameters and radiation patterns. Statistical discrepancies are noted, and results are interpreted to validate the antenna's performance.
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