Wideband and high-gain circularly polarised microstrip antenna design using sandwiched metasurfaces and partially reflecting surface

In this study, the authors propose a new type of metasurface, namely a sandwiched anisotropic metasurface, for converting a linearly polarised elliptical patch antenna into a wideband circularly polarised antenna. A partially reflecting surface (PRS) as a superstrate is further used to enhance the g...

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Bibliographic Details
Published in:IET microwaves, antennas & propagation antennas & propagation, 2019-02, Vol.13 (3), p.305-312
Main Authors: Srivastava, Kunal, Kumar, Ashwani, Chaudhary, Prashant, Kanaujia, Binod K, Dwari, Santanu, Verma, Anand K, Esselle, Karu P, Mittra, Raj
Format: Article
Language:English
Subjects:
3 dB axial ratio bandwidth
antenna performance
antenna radiation patterns
bandwidth 1.01 GHz
bandwidth 1.33 GHz
broadband antennas
combined metasurface
design rules
electromagnetic wave polarisation
frequency 3.08 GHz to 4.56 GHz
gain 7.0 dB to 7.84 dB
high‐gain circularly polarised microstrip antenna design
impedance matching
linearly polarised elliptical patch antenna
low‐cost substrate FR‐4
metamaterial antennas
microstrip antennas
microwave metamaterials
noise figure 3.0 dB
partially reflecting surface
peak gain varies
PRS superstrate
PRS‐based patch antenna
Research Article
sandwiched anisotropic metasurface
sandwiched metasurfaces
wideband circularly polarised antenna
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Summary:In this study, the authors propose a new type of metasurface, namely a sandwiched anisotropic metasurface, for converting a linearly polarised elliptical patch antenna into a wideband circularly polarised antenna. A partially reflecting surface (PRS) as a superstrate is further used to enhance the gain of the antenna. The design rules of the antenna are also presented. The combined metasurface and the PRS-based patch antenna is designed on a low-cost substrate FR-4. The realised 3 dB axial ratio bandwidth (ARBW) of the antenna is 1.01 GHz (3.55–4.56 GHz), its impedance matching bandwidth is 1.33 GHz (3.08–4.41 GHz), and its peak gain varies from 7 to 7.84 dB within the band. By placing the PRS superstrate above the antenna, gain further improves to 9.32 dBi without degrading the performance of the antenna. Measured results are presented to validate the antenna performance and results are compared against a large number of similarly available antenna.
ISSN:1751-8725
1751-8733
DOI:10.1049/iet-map.2018.5061