An Optically Transparent Near-Field Focusing Metasurface

Li, Long; Zhang, Pei; Cheng, Fei; Chang, Mingyang; Cui, Tie Jun

doi:10.1109/tmtt.2021.3061475

Cited by 60 publications

(19 citation statements)

References 49 publications

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“…The electrical ( χ 𝑒 ), and magnetic ( χ 𝑚 ) susceptibilities can be determined from the reflectivity response as indicated in Li et al, 19 from which the constitutive EM parameters, that is, effective permittivity (𝜀 𝑒𝑓𝑓 ), effective permeability (𝜇 𝑒𝑓𝑓 ) are retrieved for normal incidence. This approach is appreciated over the conventional techniques of the constituent parameter since the knowledge of 𝑆 21 for finding constitutive parameters is not required.…”

Section: Design Of Metasurface and Resultsmentioning

confidence: 99%

“…Vertical stacking of different metallic layers results in broadband absorption to some extent, at the cost of raising the device's overall thickness. Few absorbers based on the resistive sheets (conductive inks) of the dielectric substrate have also been reported 15–19 . Tuning the properties of conductive ink with required resistivity has remained a problem.…”

Section: Introductionmentioning

confidence: 99%

“…Few absorbers based on the resistive sheets (conductive inks) of the dielectric substrate have also been reported. [15][16][17][18][19] Tuning the properties of conductive ink with required resistivity has remained a problem.…”

mentioning

confidence: 99%

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Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

Shukoor

Dey

Koul

2022

Int J RF Mic Comp-Aid Eng

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This work presents a simple broadband polarization-insensitive circuit analog absorber (CAA) with wide angular stability. It comprises of dual-cut square loop resonator loaded with eight lumped resistors as top patch and an inductive grid. The normal incidence reveals a 90% absorption bandwidth of 20.51 GHz (110% fractional bandwidth) covering the entire X to K-band with a minimum flat absorption rate of 92.82%. Equivalent circuit analysis is carried out, and responses are validated with full-wave simulations. The proposed prototype is insensitive to different polarization angles under normal incidence and stable with 45 in transverse electric (TE) and transverse magnetic (TM) incidences. The design's novelty lies in using two resistors on each side of the square ring, which improves the absorptivity performance. The inductive grid enhances TM mode's angular stability. The proposed absorber is fabricated, and the measured results are in good agreement. In-band bistatic radar cross section reduction of 12.97 dBsm is obtained with the absorber using an X-band antenna. The temperature profile of the prototype is illustrated using near-in-lock infrared thermography, and 2.1 F of temperature rise is noticed in the absorption band. The proposed structure possesses a low profile, broad bandwidth, polarization insensitivity, and wide angular stability to the best of the author's knowledge.absorber, broadband, IR imaging, lumped resistor, radar cross section | INTRODUCTIONElectromagnetic (EM) wave absorption has gained significance in applications like RF energy harvesting, photodetectors, micro-bolometers, biological image sensing, EM shielding, and radar cross section (RCS) reduction in stealth technology. 1 Salisbury screen was the first traditional microwave absorber, 2 consisting of a flat resistive sheet coated on a λ g =4 ground dielectric spacer. Dependence of effective impedance on substrate thickness confines Salisbury screen to a narrow band. Jaumann absorber, 3 where stacking of different resistive on λ g =4 spacers was proposed for uniform absorption over a wideband. However, the physical size of the Jaumann screen is limiting its usage. Earlier, the EM wave absorption were also focused on pyramidal foam absorbers, carbon

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Section: Design Of Metasurface and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

Shukoor

Dey

Koul

2022

Int J RF Mic Comp-Aid Eng

View full text Add to dashboard Cite

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“…Manipulating the electromagnetic (EM) wave at will has been a long‐held dream since the discovery of Maxwell's equation. Recently, metasurfaces, spatially varying engineered subwavelength‐sized structures, have been used to control the wavefront of EM wave with unprecedented abilities by introducing phase discontinuities across the interface, [ 1 , 2 , 3 , 4 , 5 ] leading to various fascinating phenomena and novel planar device components, such as metalenses, [ 6 , 7 , 8 ] beam shapers, [ 9 , 10 ] wave plates, [ 11 , 12 ] holographic imagers, [ 13 , 14 ] and optical encryption. [ 15 ] The metasurfaces provide a flexible platform to achieve versatile wave functionalities with high performances and extraordinary capabilities that are otherwise difficult or even impossible by natural materials.…”

Section: Introductionmentioning

confidence: 99%

Angular‐Adaptive Reconfigurable Spin‐Locked Metasurface Retroreflector

et al. 2021

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Metasurface retroreflectors, which scatter the incident electromagnetic wave back to incoming direction, have received significant attention due to their compelling advantages of low profile and light weight compared with conventional bulky retroreflection devices. However, the current metasurface retroreflectors still have limitations in wide-angle and omnidirectional operations. This work proposes a high-efficiency, wide-angle, reconfigurable, and omnidirectional retroreflector composed of spin-locked phase gradient metasurface with a thickness of only 5.2 mm or 0.07 operating wavelength. The reflection phase of constituent meta-atoms can be controlled dynamically and continuously by altering their orientation states through individually addressing each mechanically rotational meta-atom, whereas the reflection handedness is kept the same as incidence. Therefore, adaptive and arbitrary momentum can be imparted to the incident wave, providing high-efficiency retroreflection over a wide continuous range from −47°to 47°. Moreover, such high-performance retroreflection is extended to omnidirectional level, enabling great degrees of freedom that are unavailable by previous researches. As a proof of concept, a retroreflective metasurface is fabricated and experimentally demonstrated at microwave frequencies. The proposed thin thickness, high efficiency, and reconfigurable metasurface retroreflector can be extended to other frequencies that may offer an untapped platform toward reconfigurable spin-based retroreflection devices for electromagnetic signal processing.

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“…Several transparent thin films such as ITO, FTO, aluminum zinc oxide (AZO), gallium zinc oxide (GZO), and silver-coated polymer (AgHT) are available to develop transparent microwave components and antennas. [1][2][3][4][5][6] However, the realized gain of these antennas is low due to the high sheet resistance of the conductive thin films. To overcome this issue, multi-layer thin films are proposed to improve the antenna properties.…”

Section: Introductionmentioning

confidence: 99%

Multilayer thin film based optically transparent dual‐band automotive windshield antenna

Potti

Alsath

Savarimuthu

et al. 2021

Int J RF Mic Comp-Aid Eng

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An optically transparent dual-band antenna operates at Long Term Evolution (LTE), WiFi, Wireless Local Area Network (WLAN), and Vehicle to Everything (V2X) communications in the automotive environment. The proposed antenna is a coplanar waveguide fed pentagonal patch with a connected ground configuration. The antenna is developed on a soda-lime glass coated with two layers of conductive oxides, viz. fluorine tin oxide (FTO) and indium tin oxide (ITO).The dual-layer conductive oxide is chosen to reduce the sheet resistance to 4 Ω/sq thereby improving the antenna radiation properties. The proposed antenna has a footprint of 50 Â 50 mm 2 . The prototype antenna is designed to operate at 1.5-3 GHz in the lower band and 4.3-7 GHz in the upper band with a percentage bandwidth of 61% and 47%, respectively. The prototype antenna is fabricated and the measured optical transmittance is greater than 72%. The antenna has measured peak gain of 0.6 and 2.7 dBi at lower and upper bands respectively. Furthermore, the on-car performance of the antenna is estimated and presented using both simulation and measurement. The study inferred that the proposed antenna is suitable for deployment on the windshield of automobiles. K E Y W O R D Sautomotive antennas, fluorine doped tin oxide (FTO), indium doped tin oxide (ITO), optically transparent antennas

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An Optically Transparent Near-Field Focusing Metasurface

Cited by 60 publications

References 49 publications

Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

Angular‐Adaptive Reconfigurable Spin‐Locked Metasurface Retroreflector

Multilayer thin film based optically transparent dual‐band automotive windshield antenna

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