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Axial ratio bandwidth enhanced circularly polarized transmitarray antenna with a flat gain response
Optics Express
|October 27, 2022
Summary
A novel circularly polarized transmitarray antenna (CPTA) uses parasitic patches to achieve a wide 27.1% axial ratio bandwidth. This broadband antenna offers a high gain and flat performance, ideal for advanced wireless systems.
Area of Science:
- Electromagnetics and Antenna Engineering
- Metamaterials and Metasurfaces
- Wireless Communication Systems
Background:
- Transmitarray antennas (CPTAs) are crucial for modern wireless systems, but achieving wide axial ratio (AR) bandwidth remains a challenge.
- Metasurfaces offer a promising approach to enhance antenna performance, particularly in terms of bandwidth and polarization control.
- Parasitic elements can be integrated into antenna designs to introduce additional resonant modes and broaden operational bandwidths.
Purpose of the Study:
- To propose and demonstrate a novel broadband circularly polarized transmitarray antenna (CPTA).
- To enhance the axial ratio (AR) bandwidth of the CPTA using a receiver-transmitter metasurface loaded with parasitic patches.
- To achieve a wide operational bandwidth with stable gain and efficient phase shifting capabilities.
Main Methods:
- A split-ring-shaped parasitic patch was designed and integrated into the receiver/transmitter metasurface to generate an additional resonant mode.
- The Pancharatnam-Berry phase principle was utilized by cascading receiver and transmitter elements with the same polarization and rotating cells to achieve a 2π phase shift.
- A CPTA prototype was designed, fabricated, and experimentally validated using a self-made circularly polarized patch antenna.
Main Results:
- The proposed receiver/transmitter patches exhibited a broadened 3-dB axial ratio (AR) bandwidth from 6.64% to 15.61%.
- The fabricated CPTA prototype achieved a wide 3-dB AR bandwidth of 27.1% (12.1–15.9 GHz) and an impedance bandwidth of 20.6% (12.5–15.2 GHz).
- A maximum gain of 25.6 dBi at 13.1 GHz was recorded, with a flat gain performance over an 18.8% 3-dB gain bandwidth (12.5–15.1 GHz).
Conclusions:
- The developed CPTA demonstrates significantly improved AR bandwidth compared to conventional designs.
- The integration of parasitic patches effectively broadens the antenna's operational bandwidth and enhances gain flatness.
- The proposed CPTA, with its simple design and superior performance, shows considerable potential for diverse wireless communication applications.
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