Nanoparticle-coated Vivaldi antenna array for gain enhancement

Faeghi, Pouya, Ghobadi, Changiz, Nourinia, Javad and Virdee, Bal Singh (2023) Nanoparticle-coated Vivaldi antenna array for gain enhancement. Applied Physics A, 129 (217). pp. 1-12. ISSN 1432-0630

Text Final Aplied Physic A 2022-11-3.pdf - Accepted Version Restricted to Repository staff only until 28 February 2024. Download (1MB) | Request a copy

Abstract / Description

A novel technique is described to significantly enhance the gain of a Vivaldi antenna (CVA) array by a factor of four (6 dB) without compromising its size and radiation characteristics. This is achieved by loading the antenna with Complementary Split Ring Resonators (CSRR) and periodic array of open loop meander-line unit cells. The unit cells are designed to exhibit properties of anisotropic zero-index metamaterial (AZIM) over a frequency range of the antenna. The inclusion of CSRR and AZIM in the antenna design is shown to effectively expand its aperture size with the advantage of not impacting on the overall size of the antenna. Moreover, the antenna is excited with a novel feedline consisting of hair-comb radial-stubs (HCRS) that matches the impedance the 50-Ω feedline with the radiating elements of the antenna to thereby maximize power transfer. The proposed antenna array was fabricated to validate its performance. The peak measured gain of the array is 7.49 dBi at 177 degrees in the E-plane and its sidelobes are 10 dB below the peak gain. The 3-dB beamwidth of the array is 32.8 degrees. Furthermore, it is shown for the first time that by depositing a thin film of Graphene/copper nanoparticles onto the CSRR, the array’s gain is increased to 10 dBi at 180 degrees with sidelobe reduction of better than 15 dB.

Item Type:	Article
Additional Information:	This version of the article has been accepted for publication, after peer review, and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s00339-023-06505-4
Uncontrolled Keywords:	Conventional Vivaldi antenna, miniaturization, gain enhancement, metamaterial, hair-comb radial-stub feed
Subjects:	600 Technology 600 Technology > 620 Engineering & allied operations
Department:	School of Computing and Digital Media
Depositing User:	Bal Virdee
Date Deposited:	16 Mar 2023 10:32
Last Modified:	16 Mar 2023 10:32
URI:	https://repository.londonmet.ac.uk/id/eprint/8411

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