Ultra-Wideband Frequency Selective Surface With Metal Gratings for Polarization Conversion Under Arbitrary Polarized Angles
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https://doi.org/10.13052/2025.ACES.J.401005关键词:
Grating-via-grating (GVG) module, incidence stability, polarization converter, polarization insensitivity, ultra-wideband摘要
A frequency selective surface (FSS) with metal gratings (FSSMGs) is proposed for insensitive cross polarization conversion in an ultra-wide bandwidth. To obtain the ultra-wide bandwidth, a multiple-resonance structure of metal gratings are selected as the sub-units. The unit of FSSMGs is composed of four grating-via-grating (GVG) modules. Each GVG module is made up of two layers of vertically arranged metal grids, quasi-wave-guiding structures (metalized vias), and shielded floors. To ensure the FSSMGs convert waves in arbitrary polarization directions, the four GVG modules in the unit are rotationally symmetric arranged. Simulated results show that the cross-polarization transmission coefficient is greater than −1 dB in an ultra-wide band of 8.17–18.5 GHz (77.5%), in which the PCR (polarization conversion ratio) and the ECR (energy conversion ratio) are greater than 90%. Meanwhile, the designed FSSMGs is insensitive for arbitrary polarized angles. In addition, the proposed FSSMGs can operate in the band 8.17–12 GHz (38.0%) and 15–18.5 GHz (20.9%) when the incident angle is less than 45∘. To verify the simulated results, the proposed FSSMGs was fabricated and measured, and the measured results are in good agreement with the simulated ones.
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