研究目的
Investigating the design and performance of a 140 GHz linear to circular polarization converter based on a modified cross slot frequency selective surface with high selectivity.
研究成果
The proposed 140 GHz LP-to-CP converter based on modified cross slot FSS demonstrates flat passband characteristics with low insertion loss and high sideband selectivity, fabricated using low-cost single-layer normal PCB technology.
研究不足
Fabrication tolerance in the THz band and misalignment due to rotation of the polarization converter cause phase error and deteriorate the measured axial ratio compared to simulated results.
1：Experimental Design and Method Selection:
The design involves a square substrate integrated waveguide (SIW) cavity and two cross slots with stubs etched on the top and bottom layers of the cavity to achieve high sideband selectivity and low insertion loss.
2：Sample Selection and Data Sources:
A prototype was fabricated using normal PCB technology, consisting of 40×40 elements.
3：List of Experimental Equipment and Materials:
A substrate with εr =
4：8, tanδ = 0012, and thickness h = 254 mm was used. Simulation was carried out using Ansys HFSS. Experimental Procedures and Operational Workflow:
The transmission and reflection coefficients for TE- and TM-polarizations were measured by rotating the polarization converter 90°.
5：0°. Data Analysis Methods:
5. Data Analysis Methods: The magnitudes and phases of the two responses were displayed using a vector network analyzer (VNA).
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