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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Nature Portfolio
2021-07-01
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Series: | Scientific Reports |
Online Access: | https://doi.org/10.1038/s41598-021-93975-2 |
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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 |
collection | DOAJ |
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. |
first_indexed | 2024-12-18T04:42:19Z |
format | Article |
id | doaj.art-105db3f4e4324c87995e18773cfac7f4 |
institution | Directory Open Access Journal |
issn | 2045-2322 |
language | English |
last_indexed | 2024-12-18T04:42:19Z |
publishDate | 2021-07-01 |
publisher | Nature Portfolio |
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series | Scientific Reports |
spelling | doaj.art-105db3f4e4324c87995e18773cfac7f42022-12-21T21:20:41ZengNature PortfolioScientific Reports2045-23222021-07-0111111310.1038/s41598-021-93975-2A dielectric free near field phase transforming structure for wideband gain enhancement of antennasFoez Ahmed0Muhammad U. Afzal1Touseef Hayat2Karu P. Esselle3Dushmantha N. Thalakotuna4School of Electrical and Data Engineering, University of Technology Sydney (UTS)School of Electrical and Data Engineering, University of Technology Sydney (UTS)School of Engineering, Macquarie UniversitySchool of Electrical and Data Engineering, University of Technology Sydney (UTS)School of Electrical and Data Engineering, University of Technology Sydney (UTS)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.https://doi.org/10.1038/s41598-021-93975-2 |
spellingShingle | 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 Scientific Reports |
title | 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_short | 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 |
url | https://doi.org/10.1038/s41598-021-93975-2 |
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