Approximation of effective dielectric constant for FSS in layered dielectrics using conformal mapping

Pieper, Dustin F.; Donnell, Kristen M.

doi:10.1109/aps.2015.7304883

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…In the microwave and millimetre-wave regime, these sensors are interrogated with an electromagnetic wave and their response is correlated to sensing parameters. One type of these sensors are frequency selective surfaces (FSS), which are planar periodic arrays of conductive shapes or slots cut out of conductor planes that create a specific frequency response (typically resonant) to an interrogating electromagnetic wave [221,222]. While an FSS can be active or passive, passive FSSs are the focus here [223].…”

Section: Sensors and Sensingmentioning

confidence: 99%

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Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Brinker

Dvorsky

Ghasr

et al. 2020

Phil. Trans. R. Soc. A.

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Microwave and millimetre-wave non-destructive testing and evaluation (NDT&E) has a long history dating back to the late 1950s (Bahr 1982 Microwave non-destructive testing methods ; Zoughi 2000 Microwave Non-destructive testing and evaluation principles ; Feinstein 1967 Surface crack detection by microwave methods ; Ash 1973 In 3rd European Microwave Conference ; Auld 1981 Phys. Technol. 12 , 149–154; Case 2017 Mater. Eval. 75 ). However, sustained activities in this field date back to the early 1980s (Zoughi 1995 Res. Nondestr. Eval. 7 , 71–74; Zoughi 2018 Mater. Eval. 76 , 1051–1057; Kharkovsky 2007 IEEE Instrumentation & Measurement Magazine 10 , 26–38). Owing to various limitations associated with using microwaves and millimetre waves for NDT&E, these techniques did not see much utility in the early days. However, with the advent and prevalence of composite materials and structures, in a wide range of applications, and technological advances in high-frequency component design and availability, these techniques are no longer considered as ‘emerging techniques’ (Zoughi 2018 Mater. Eval. 76 , 1051–1057; Schull 2002 Nondestructive evaluation: theory, techniques, and applications ). Currently, microwave and millimetre-wave NDT&E is a rapidly growing field and has been more widely acknowledged and accepted by practitioners over the last 25+ years (Case 2017 Mater. Eval. 75 ; Bakhtiari 1994 IEEE Trans. Microwave Theory Tech . 42 , 389–395; Bakhtiari 1993 Mater. Eval. 51 , 740–743; Bakhtiari 1993 IEEE Trans. Instrum. Meas. 42 , 19–24; Ganchev 1995 IEEE Trans. Instrum. Meas. 44 , 326–328; Bois 1999 IEEE Trans. Instrum. Meas. 48 , 1131–1140; Ghasr 2009 IEEE Trans. Instrum. Meas. 58 , 1505–1513). Microwave non-destructive testing was recently recognized and designated by the American Society for Nondestructive Testing (ASNT) as a ‘Method’ on its own (Case 2017 Mater. Eval. 75 ). These techniques are well suited for materials characterization; layered composite inspection for thickness, disbond, delamination and corrosion under coatings; surface-breaking crack detection and evaluation; and cure-state monitoring in concrete and resin-rich composites, to name a few. This work reviews recent advances in four major areas of microwave and millimetre-wave NDT&E, namely materials characterization, surface crack detection, imaging and sensors. The techniques, principles and some of the applications in each of these areas are discussed. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Section: Sensors and Sensingmentioning

confidence: 99%

“…While an FSS can be active or passive, passive FSSs are the focus here [223]. FSSs have been widely used in radome and filtering applications, but have also found a role in sensing-based NDT&E [221,222]. For FSS-based sensors, typically either a material that is sensitive to the sensing parameter (e.g.…”

Section: Sensors and Sensingmentioning

confidence: 99%

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Brinker

Dvorsky

Ghasr

et al. 2020

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

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“…For the cascading unit, the total capacitance, C t (from which ɛ r , eff is calculated), of the FSS can be decomposed into a set of partial capacitances, which is described by C t = C 0 + C 1 + C 2 + C 3 , where C 0 denotes the capacitance of the adjacent strips in free space. C 1 , C 2, and C 3 are calculated in Reference and resulted from the other three dielectric layers in the unit. The revised transmission phase and magnitude both match well with the full‐wave simulation results.…”

Section: Array Designmentioning

confidence: 99%

A simple design of SIW horn fed multibeam transmitarray antenna using transmission matrix approach

Cai

Xue

et al. 2019

Micro & Optical Tech Letters

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This article develops an efficient solution to design beam‐scanning transmitarray (TA). The four‐layer unit associated with the focal planar substrate integrated waveguide (SIW) array is presented and characterized. The proposed linearly polarized TA is implemented as four‐layer sheet admittance composed of the subwavelength unit, whose transmission feature would be accurate analyzed by the equivalent circuit model. The phase layout of TA is optimized by using the PMM method in order to achieve a wide scanning behavior and reduce the scan loss. Arc‐shaped SIW horn antenna array is adopted as the feeding source. Artificial impedance surfaces printed on either side against the low‐profile substrate results in a greatly enhanced radiation performance. The TA and feeds presented at 20 GHz are both fabricated using standard PCB processing. The measured results show a greatly improved ±45° scan range with the gain loss of 0.73 dBi by switching the SIW horn antenna. Good radiation and bandwidth characters are performed in all states of operation for both ports, confirmed the effectiveness of proposed design process.

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Approximation of effective dielectric constant for FSS in layered dielectrics using conformal mapping

Cited by 2 publications

References 4 publications

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

A simple design of SIW horn fed multibeam transmitarray antenna using transmission matrix approach

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