Microwave Subsurface Imaging of Composite Structures Using Complementary Split Ring Resonators

Govind, Greeshmaja; Tiwari, Nilesh Kumar; Agrawal, K.K.; Akhtar, M. Jaleel

doi:10.1109/jsen.2018.2859228

Cited by 35 publications

(24 citation statements)

References 23 publications

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“…Such type of CSRR based sensors could be utilized for imaging purposes by making the detection possible at multiple points on the surface of test structure which are then compiled into two‐dimensional images for better visualization. In addition to studies on subsurface flaws in metallic test structures, dielectric as well as composite structures with concealed defects have also been meticulously investigated . The method is advantageous compared with other microwave techniques owing to its higher sensitivity and low fabrication cost.…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that the circular CSRR structure is more sensitive toward the change in permittivity compared with a square CSRR of the same dimension . However, for the microwave imaging of various structures, only simple rectangular and circular CSRR geometries have been used till now …”

Section: Introductionmentioning

confidence: 99%

“…This method, incorporating two additional parameters, compared with the frequency shift alone based formulations discussed in Refs. 12 and 13, could model the quantitative imaging scenario better and hence provided improved reconstructions. The proposed nondestructive testing technique finds application in detecting flaws under paint coating, inspection of composite surfaces for maintenance, biomedical imaging of subcutaneous tumor cells, quality assessment of wood, crack detection in metals, etc.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to studies on subsurface flaws in metallic test structures, 11 dielectric as well as composite structures with concealed defects have also been meticulously investigated. 12,13 The method is advantageous compared with other microwave techniques owing to its higher sensitivity and low fabrication cost. Thus, with the use of planar resonant sensors, it is possible to image electrically small structures which otherwise cannot be imaged accurately using alternate methods.…”

Section: Introductionmentioning

confidence: 99%

“…4 However, for the microwave imaging of various structures, only simple rectangular and circular CSRR geometries have been used till now. 11,12 The work presented in this article is mainly focused on determining the subsurface flaws in dielectric structures using CSRR sensors of fractal geometries. Sensors that use CSRRs of square Sierpinski fractal geometries of first and second orders are proposed for imaging of dielectric structures, and their performances are studied in detail.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

Govind

Akhtar

2018

Int J RF Microw Comput Aided Eng

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In this paper, newly proposed complementary split ring resonator (CSRR) structures of fractal geometries are used for microwave imaging of coated dielectric structures in order to detect concealed voids or similar inclusions. The proposed fractal‐based CSRR structures are found to display improved sensitivity as compared to the conventional square CSRR sensors of same cross‐sectional dimensions, and thus appear to be more appropriate for imaging applications. Detailed analyses of different orders of square Sierpinski fractals have been carried out. Raster scanning of the test region is performed and various parameters such as the magnitude and phase at unloaded resonant frequency, along with the shift in resonant frequency when loaded with the test structure are measured. Furthermore, both qualitative and quantitative images of the test structure are retrieved in terms of all the three measured parameters. Simulation and experimental results demonstrate the applicability of the proposed sensor for microwave imaging.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

Govind

Akhtar

2018

Int J RF Microw Comput Aided Eng

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Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Sun

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the developing of interdigital capacitor (IDC) based symmetric coplanar waveguide (CPW) sensor to characterize the complex permittivity of unknown dielectric sheets. The symmetric structure is realized by using two identical 3 dB CPW dividers where each branch is loaded with an IDC unit. The proposed method is designed using three, five, and seven fingers of the IDC unit, and the measurement sensitivity is analyzed accordingly. The permittivity of tested samples is extracted by the genetic algorithm. To validate the robust sensing performance of the proposed method, simulation and experimental tests are performed and analyzed, and the accuracy is compared with published values. The proposed method gives the maximum error of 3.42%. With the feature of high-sensitivity, the proposed sensor can be used as an excellent candidate for determining the permittivity of materials in microwave frequencies.K E Y W O R D S coplanar waveguide, high sensitivity, interdigital capacitor, permittivity extraction, symmetric sensor

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Design of slot radiating RF planar sensor for homogeneity check of dielectric discontinuity

Banerjee

Akhtar

2023

Micro & Optical Tech Letters

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In this paper, a 2.8-GHz RF planar sensor with radiating slots is proposed for effective checking of discontinuity in homogeneous dielectric samples. The slots etched in the ground plane reduce the effective area for sample placement, which increases in the case of a conventional ring at the desired frequency. Several forms of discontinuity are analyzed and measured with the help of varying geometrical configurations of Teflon, wood, and polyethylene samples with varying permittivity. It is observed that due to the uniform distribution of fields among all the radiating slots any sort of configurational discontinuity is detected by the sensor in terms of the shift in resonant frequency and S 21 transmission notch. The simulations are carried out using CST-MWS and the equivalent model is developed using ADS. The numerical analysis is carried out using Origin software and the measurement is carried out using Taconic TLY-5 substrate by photolithographic etching.

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Microwave Subsurface Imaging of Composite Structures Using Complementary Split Ring Resonators

Cited by 35 publications

References 23 publications

Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Design of slot radiating RF planar sensor for homogeneity check of dielectric discontinuity

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