A Low-Profile Broadband Circularly Polarized Metasurface Antenna Aperture Coupled by Shorted Annular-Ring Slot

A low-profile (LP) metasurface antenna is proposed for broadband circularly polarized (CP) operations. The metasurface radiator, formed by a 5 × 5 array of square patches, has a microstrip line fed at its bottom through a shorted annular-ring slot centered on the ground plane. First, the characteris...

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Bibliographic Details
Published in:International journal of antennas and propagation 2022-08, Vol.2022, p.1-9
Main Authors: Liu, Shuangbing, Yang, Lixia, Chen, Qian, Wu, Xianliang
Format: Article
Language:English
Subjects:
Antennas
Bandwidths
Broadband
Circular polarization
Ground plane
Metasurfaces
Microstrip transmission lines
Radiation
Radiators
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Summary:A low-profile (LP) metasurface antenna is proposed for broadband circularly polarized (CP) operations. The metasurface radiator, formed by a 5 × 5 array of square patches, has a microstrip line fed at its bottom through a shorted annular-ring slot centered on the ground plane. First, the characteristic mode analysis (CMA) methodology is employed to examine the intrinsic modes of the metasurface. Subsequently, a pair of mutually orthogonal modes is selected and excited by the feeding structure with a 90° phase difference to produce CP radiation. For the purpose of verification, a prototype antenna is developed, and the obtained data reveal that the antenna exhibits an impedance bandwidth of 43.9% ranging from 4.8 to 7.5 GHz (S11
ISSN:1687-5869
1687-5877
DOI:10.1155/2022/8517646