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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Main Authors: Foez Ahmed, Muhammad U. Afzal, Touseef Hayat, Karu P. Esselle, Dushmantha N. Thalakotuna
Format: Article
Language:English
Published: Nature Portfolio 2021-07-01
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.
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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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