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Development of UWB High-Gain Vivaldi Array Antenna for Microwave Imaging of Construction Materials and Composite Structure

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 10455

Special Issue Editors

Dr. Mahdi Moosazadeh

E-Mail Website
Guest Editor
Department of Electrical and Electronic Engineering, The University of Melbourne, Melbourne, VIC 3010, Australia
Interests: Array antenna; high-gain antenna; microwave imaging; NDT&E
Prof. Dr. Andrey Miroshnichenko

grade E-Mail Website
Guest Editor
School of Engineering and Information Technology, University of New South Wales Canberra, Northcott Drive, Campbell, ACT 2600, Australia
Interests: nanophotoncis; nonlinear optics; optoelectronics; light-matter interaction; fano resonances
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The rapid development of microwave non-destructive testing and evaluation (NDT&E) of materials and structures has increased the demand for improved microwave measurement methods and techniques. The use of ultra-wideband (UWB) measurement systems is of particular interest for civil engineering applications as it can detect defects and damages in construction materials and composite structures using imaging methods and techniques. The development of UWB high-gain Vivaldi array antennas for these systems with proper dimensions and high performance is one of the major challenges. The success of applying the UWB microwave technique is dependent on the operating frequency utilized for specified material under test.

Dr. Mahdi Moosazadeh
Prof. Dr. Andrey Miroshnichenko
Guest Editors

Manuscript Submission Information

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Keywords

  • antenna array
  • microwave imaging
  • Vivaldi antenna
  • non-destructive testing and evaluation (NDT&E)
  • construction materials and composite structure

Published Papers (2 papers)

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Research

17 pages, 7242 KiB  
Article
Vivaldi Antenna Arrays Feed by Frequency-Independent Phase Shifter for High Directivity and Gain Used in Microwave Sensing and Communication Applications
by Jiwan Ghimire, Feyisa Debo Diba, Ji-Hoon Kim and Dong-You Choi
Sensors 2021, 21(18), 6091; https://doi.org/10.3390/s21186091 - 11 Sep 2021
Cited by 11 | Viewed by 3321
Abstract
This paper describes a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer using a unique combination of power splitters based on binary T-junction power splitter topology, frequency-independent phase shifter, and a T-branch. The proposed [...] Read more.
This paper describes a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer using a unique combination of power splitters based on binary T-junction power splitter topology, frequency-independent phase shifter, and a T-branch. The proposed antenna system consists of six Vivaldi antennas, three on the left, and three on the right arm. Each arm connects with T-junction power divider splitter topology, given that the right arm is linked through a frequency-independent phase shifter. Phase shifters ensure that the beam is symmetrical without splitting in a radiating plane so that highly directive radiation patterns occur. The optimal return losses (S-parameters) are well enriched by reforming Vivaldi’s feeding arms and optimizing Vivaldi slots and feeds. A novel feature of our design is that the antenna exhibits the arrangements of a T-junction power splitter with an out-of-phase feeding mechanism in one of the arms, followed by a T-branching feeding to even arrays of proper Vivaldi antenna arrangement contributing high realized gain and front-to-back ratio up to 14.12 dBi and 23.23 dB respectively applicable for not only ultra-wideband (UWB) application, also for sensing and position detecting. The high directivity over the entire UWB frequency band in both higher and lower frequency ranges ensures that the antenna can be used in microwave through-wall imaging along with resolution imaging for ground penetration radar (GPR) applications. The fabricated antenna parameters are in close agreement with the simulated and measured results and are deployed for the detection of targets inside the voids of the concrete brick. Full article
(This article belongs to the Special Issue Development of UWB High-Gain Vivaldi Array Antenna for Microwave Imaging of Construction Materials and Composite Structure)
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17 pages, 5545 KiB  
Article
Compact Dual-Polarized Vivaldi Antenna with High Gain and High Polarization Purity for GPR Applications
by Hai-Han Sun, Yee Hui Lee, Wenhao Luo, Lai Fern Ow, Mohamed Lokman Mohd Yusof and Abdulkadir C. Yucel
Sensors 2021, 21(2), 503; https://doi.org/10.3390/s21020503 - 12 Jan 2021
Cited by 20 | Viewed by 5762
Abstract
A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the low-end operating frequency and improve the port isolation with a compact antenna size. [...] Read more.
A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the low-end operating frequency and improve the port isolation with a compact antenna size. The directivity of the antenna is enhanced by the oblique position of the radiators and the implementation of a square loop reflector. Experimental results demonstrate that the antenna has very good impedance matching, port isolation, and dual-polarized radiation performance, with low dispersion characteristics across band of interest from 0.4 GHz to 3.0 GHz. GPR measurements with the designed antenna show that the antenna maintains good detection capability even for objects buried in a highly conductive soil. Full article
(This article belongs to the Special Issue Development of UWB High-Gain Vivaldi Array Antenna for Microwave Imaging of Construction Materials and Composite Structure)
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