Broadband Circular Polarizer Based on Plasmon Hybridizations

This paper presents a broadband circular polarizer with a ring/disk cavity structure, which is a broadband application of plasmon hybridizations. The proposed design can convert a linearly polarized wave to a circularly polarized wave from 12.66 GHz to 17.43 GHz within a bandwidth of 30%. The broadband polarization conversion characterization results from the different plasmon hybridization modes induced in the ring/disk cavity. The proposed broadband circular polarizer is demonstrated by both full-wave simulation and measurement.

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Research of the impact of coupling between unit cells on performance of linear-to-circular polarization conversion metamaterial with half transmission and half reflection

International Journal of Modern Physics B ◽

10.1142/s0217979218501242 ◽

2018 ◽

Vol 32 (10) ◽

pp. 1850124

Author(s):

Mengchao Guo ◽

Kan Zhou ◽

Xiaokun Wang ◽

Haiyan Zhuang ◽

Dongming Tang ◽

...

Keyword(s):

Electrical Circuit ◽

Circuit Model ◽

Polarization Conversion ◽

Equivalent Electrical Circuit ◽

Circularly Polarized ◽

Unit Cells ◽

Linearly Polarized ◽

Electrical Circuit Model ◽

Equivalent Electrical Circuit Model ◽

The Impact

In this paper, the impact of coupling between unit cells on the performance of linear-to-circular polarization conversion metamaterial with half transmission and half reflection is analyzed by changing the distance between the unit cells. An equivalent electrical circuit model is then built to explain it based on the analysis. The simulated results show that, when the distance between the unit cells is 23 mm, this metamaterial converts half of the incident linearly-polarized wave into reflected left-hand circularly-polarized wave and converts the other half of it into transmitted left-hand circularly-polarized wave at 4.4 GHz; when the distance is 28 mm, this metamaterial reflects all of the incident linearly-polarized wave at 4.4 GHz; and when the distance is 32 mm, this metamaterial converts half of the incident linearly-polarized wave into reflected right-hand circularly-polarized wave and converts the other half of it into transmitted right-hand circularly-polarized wave at 4.4 GHz. The tunability is realized successfully. The analysis shows that the changes of coupling between unit cells lead to the changes of performance of this metamaterial. The coupling between the unit cells is then considered when building the equivalent electrical circuit model. The built equivalent electrical circuit model can be used to perfectly explain the simulated results, which confirms the validity of it. It can also give help to the design of tunable polarization conversion metamaterials.

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Design of Transmission Polarization Metasurface Converter

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1035.718 ◽

2021 ◽

Vol 1035 ◽

pp. 718-723

Author(s):

Bo Wen Han ◽

Si Jia Li ◽

Xiang Yu Cao ◽

Jun Gao

Keyword(s):

Simple Structure ◽

Axial Ratio ◽

Polarization Conversion ◽

Current Analysis ◽

Polarization Converter ◽

Circularly Polarized ◽

Polarized Waves ◽

Relative Bandwidth ◽

Linearly Polarized ◽

Simulation Results

The transmission polarization metasurface converter is an effective method to realize the polarization manipulation of the transmission waves, and it is also the research hotspot of metasurfaces. A new broadband transmissive polarization converter was proposed based on the metasurfaces converted incident linearly polarized waves into circularly polarized waves of transmission. The top and bottom layers of the unit were axisymmetric metal patches. The top and bottom layers of metal patches were overlapped and the shape was like an arrow. The thickness of the substrate was 4mm. The polarization conversion mechanism of metasurface was illustrated by parameter optimization and current analysis. The simulation results show that when the metasurface works in the frequency band of 6.71GHz~8.45GHz, the linearly polarized incident wave can be converted into a circularly polarized transmitted wave with axial ratio less than 3dB, and the relative bandwidth can reach 23%. The designed polarization converter has a simple structure and the potential application value in electromagnetic wave control of radio frequency devices.

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