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Isolated Gain Enhancement for Dual-Band C-Metaloop Antennas Using a Coplanar Compound Method

Hisamatsu Nakano Orcid Logo, Tomoki Abe Orcid Logo, Amit Mehta Orcid Logo, Junji Yamauchi Orcid Logo

IEEE Transactions on Antennas and Propagation, Volume: 71, Issue: 7, Pages: 5616 - 5625

Swansea University Author: Amit Mehta Orcid Logo

Abstract

When the circumference of a round metaloop antenna (RoMLA), made of C-type meta-atoms, is one guided wavelength (1λ g ) of the current on the loop, the RoMLA radiates a left-hand CP wave at frequency f N and a right-hand CP wave at frequency f H in the direction normal to the antenna plane. These CP...

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Published in: IEEE Transactions on Antennas and Propagation
ISSN: 0018-926X 1558-2221
Published: Institute of Electrical and Electronics Engineers (IEEE) 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa63351
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Abstract: When the circumference of a round metaloop antenna (RoMLA), made of C-type meta-atoms, is one guided wavelength (1λ g ) of the current on the loop, the RoMLA radiates a left-hand CP wave at frequency f N and a right-hand CP wave at frequency f H in the direction normal to the antenna plane. These CP waves have different maximum gains. This paper discusses enhancement in the small gain, not affecting the inherent large gain. Such uncorrelated enhancement in the gain, named the isolated gain enhancement (IsoGE), differs from conventional correlated gain enhancement (non-IsoGE). For IsoGE, a parasitic ring is inserted into the open space of the RoMLA, while maintaining the low-profile RoMLA structure on the order of λ 0 /100 with λ 0 being the free-space operating wavelength. It is found that the ring finally transformed into a round patch is effective for the IsoGE, where the induced current on the patch contributes to increasing the small gain. The analysis, for the first time, shows that the axial ratio and VSWR are, respectively, less than 3 dB and 2 across the 3-dB gain bandwidths around f N and f H , as desired. Furthermore, the insertion of a square parasitic patch within the open space of a square metaloop antenna is also found to be effective for the IsoGE.
Keywords: Antennas, Gain, Metamaterials, Dual band. Loop antennas, Compounds, Extremities, circular polarization, dual-band metaloop antenna, meta-atom, uncorrelated gain enhancement
College: Faculty of Science and Engineering
Funders: This work was supported in part by the Japan Society for the Promotion of Science (JSPS) KAKENHI under Grant JP21K04068.
Issue: 7
Start Page: 5616
End Page: 5625