A dielectric free near field phase transforming structure for wideband gain enhancement of antennas

Abstract The gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its abil...

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Autores principales:	Foez Ahmed, Muhammad U. Afzal, Touseef Hayat, Karu P. Esselle, Dushmantha N. Thalakotuna
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/105db3f4e4324c87995e18773cfac7f4
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spelling	oai:doaj.org-article:105db3f4e4324c87995e18773cfac7f42021-12-02T16:31:47ZA dielectric free near field phase transforming structure for wideband gain enhancement of antennas10.1038/s41598-021-93975-22045-2322https://doaj.org/article/105db3f4e4324c87995e18773cfac7f42021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93975-2https://doaj.org/toc/2045-2322Abstract The gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its ability to correct the aperture phase distribution of a resonant cavity antenna (RCA) over a much wider bandwidth is demonstrated. As opposed to printed multilayered metasurfaces, all the cells in crucial locations of the DF-PTS have a phase response that tracks the phase error of the RCA over a large bandwidth, and in addition have wideband transmission characteristics, resulting in a wideband antenna system. The new DF-PTS, made of three thin metal sheets each containing modified-eight-arm-asterisk-shaped slots, is significantly stronger than the previous DF-PTS, which requires thin and long metal interconnects between metal patches. The third advantage of the new DF-PTS is, all phase transformation cells in it are highly transparent, each with a transmission magnitude greater than − 1 dB at the design frequency, ensuring excellent phase correction with minimal effect on aperture amplitude distribution. With the DF-PTS, RCA gain increases to 20.1 dBi, which is significantly greater than its 10.7 dBi gain without the DF-PTS. The measured 10-dB return loss bandwidth and the 3-dB gain bandwidth of the RCA with DF-PTS are 46% and 12%, respectively.Foez AhmedMuhammad U. AfzalTouseef HayatKaru P. EsselleDushmantha N. ThalakotunaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Foez Ahmed Muhammad U. Afzal Touseef Hayat Karu P. Esselle Dushmantha N. Thalakotuna A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
description	Abstract The gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its ability to correct the aperture phase distribution of a resonant cavity antenna (RCA) over a much wider bandwidth is demonstrated. As opposed to printed multilayered metasurfaces, all the cells in crucial locations of the DF-PTS have a phase response that tracks the phase error of the RCA over a large bandwidth, and in addition have wideband transmission characteristics, resulting in a wideband antenna system. The new DF-PTS, made of three thin metal sheets each containing modified-eight-arm-asterisk-shaped slots, is significantly stronger than the previous DF-PTS, which requires thin and long metal interconnects between metal patches. The third advantage of the new DF-PTS is, all phase transformation cells in it are highly transparent, each with a transmission magnitude greater than − 1 dB at the design frequency, ensuring excellent phase correction with minimal effect on aperture amplitude distribution. With the DF-PTS, RCA gain increases to 20.1 dBi, which is significantly greater than its 10.7 dBi gain without the DF-PTS. The measured 10-dB return loss bandwidth and the 3-dB gain bandwidth of the RCA with DF-PTS are 46% and 12%, respectively.
format	article
author	Foez Ahmed Muhammad U. Afzal Touseef Hayat Karu P. Esselle Dushmantha N. Thalakotuna
author_facet	Foez Ahmed Muhammad U. Afzal Touseef Hayat Karu P. Esselle Dushmantha N. Thalakotuna
author_sort	Foez Ahmed
title	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
title_short	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
title_full	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
title_fullStr	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
title_full_unstemmed	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
title_sort	dielectric free near field phase transforming structure for wideband gain enhancement of antennas
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/105db3f4e4324c87995e18773cfac7f4
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A dielectric free near field phase transforming structure for wideband gain enhancement of antennas

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