Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding

Yang, Yiming; Li, Weiwei; Salama, Khaled N.; Shamim, Atif

doi:10.1109/tap.2020.3032827

Cited by 47 publications

(38 citation statements)

References 53 publications

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“…Few papers have been reported so far in transparent FSS structures manufactured via printing technologies. In recent work by Li and co‐workers, [ 17 ] a single‐layer, dual‐band, optically transparent FSS is proposed. This FSS structure was fabricated via the screen‐printing of AgNWs.…”

Section: Printed Transparent Rf Electronicsmentioning

confidence: 99%

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

“…Another example is a transparent frequency selective surface (FSS), which is a periodic structure for selectively shielding from unwanted frequency bands while allowing the bands of interest to pass through. [ 12–17 ] Other examples of transparent RF electronics include RF circuits, [ 18 ] EM absorbers, [ 19–21 ] RF shielding, [ 22–25 ] and RF energy harvesting. [ 26,27 ]…”

Section: Introductionmentioning

confidence: 99%

“…Another example is a transparent frequency selective surface (FSS), which is a periodic structure for selectively shielding from unwanted frequency bands while allowing the bands of interest to pass through. [12][13][14][15][16][17] Other examples of transparent RF electronics include RF circuits, [18] EM absorbers, [19][20][21] RF shielding, [22][23][24][25] and RF energy harvesting. [26,27] A highly suitable approach to realize this new form of mechanically flexible and optically transparent RF electronics is via printing technologies.…”

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confidence: 99%

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confidence: 99%

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Optically Transparent and Flexible Radio Frequency Electronics through Printing Technologies

Akhter

Vaseem

et al. 2022

Adv Materials Technologies

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on several nonplanar objects and worn by humans, they must be mechanically flexible. Moreover, to maintain the abundance of such wireless devices in a smart city and still maintain the aesthetics, it is desirable that they be optically transparent. Finally, to afford this IoT revolution, in which billions of devices are required, the cost of an individual device must be extremely low. As displayed in Figure 1, this new form of transparent RF electronics can help in many smart city applications without affecting the functions of the existing structures where they will be deployed. For example, specially designed periodic structures, namely reconfigurable intelligent surfaces (RIS), can enhance the 5G and beyond communication by increasing the coverage area, spectrum, and energy efficiency. [7] Transparent RIS integrated on buildings, cars, and train windows can optimize the reflection and transmission characteristics of the 5G signal according to the user positions via tunable and switchable devices. [8] Transparent antennas on cars can provide diverse connectivity for radio, GPS, television, smartphones, and so on while maintaining aesthetics. [9][10][11] This can likewise serve as a mainstream technology for autonomous cars, which would rely on radar antennas on the car body. Another example is a transparent frequency selective surface (FSS), which is a periodic structure for selectively shielding from unwanted frequency bands while allowing the bands of interest to pass through. [12][13][14][15][16][17] Other examples of transparent RF electronics include RF circuits, [18] EM absorbers, [19][20][21] RF shielding, [22][23][24][25] and RF energy harvesting. [26,27] A highly suitable approach to realize this new form of mechanically flexible and optically transparent RF electronics is via printing technologies. Printed electronics (PE), as the name suggests, are electronic devices manufactured using traditional printing technologies. Compared with conventional fabrication techniques, such as milling, photolithography, and etching, [11,18,20,28,29] printing has many merits that make it suitable for the subsequent generations of electronics, such as ease of mass production with simple procedures, lower costs, higher throughput, and the ability to work with flexible materials and substrates. PE technologies allow for the direct deposition of various materials, including conductors, semiconductors, and dielectrics, among others, on different flexible substrates to form 2D and 3D patterns. PE has been widely

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Section: Printed Transparent Rf Electronicsmentioning

confidence: 99%

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Another example is a transparent frequency selective surface (FSS), which is a periodic structure for selectively shielding from unwanted frequency bands while allowing the bands of interest to pass through. [12][13][14][15][16][17] Other examples of transparent RF electronics include RF circuits, [18] EM absorbers, [19][20][21] RF shielding, [22][23][24][25] and RF energy harvesting. [26,27] A highly suitable approach to realize this new form of mechanically flexible and optically transparent RF electronics is via printing technologies.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Optically Transparent and Flexible Radio Frequency Electronics through Printing Technologies

Akhter

Vaseem

et al. 2022

Adv Materials Technologies

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Flexible and Large‐Scale Liquid Metal Frequency‐Selective Surfaces: Enhanced Tuning through Mechanical Reconfiguration

Wang,

Ma,

Wang

et al. 2024

Adv Eng Mater

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The tuning capability is crucial for broadening the application possibilities of frequency‐selective surfaces (FSSs). Flexible and stretchable FSSs have attracted widespread research interest due to their ability for adhering to curved surfaces conformally and reconfiguring electromagnetic (EM) wave transmission performance mechanically. However, conventional metal FSSs lack sufficient flexibility and deformability due to material constraints, resulting in diminished durability and limited EM tuning range. In this article, a design approach for flexible liquid metal FSS (LMFSS), which can conform to curved structures and achieve a wide range of EM wave tuning via mechanical stretching without structural damage, is presented. The fabrication of LMFSS is simplified using silicone elastomer curing and liquid metal inkjet printing, avoiding the complexities of traditional microchannel techniques. In the experimental results, it is demonstrated that the designed LMFSS achieves a tuning range of up to 16% under biaxial stretch strains not more than 25%. The tuning mechanism is explored through mechanical–EM simulations and equivalent circuit analyses. Additionally, the tuning phenomenon observed in another flexible LMFSS in this study underscores the portability of the design approach and tuning mechanism. In this research, a promising direction for tunable flexible LMFSS applications is offered.

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Conformal ultra‐miniaturized frequency selective surface for medical shielding applications

Viswanathan,

Kanagasabai,

Mohammed

2024

Int J Communication

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SummaryThis article presents a novel wearable frequency selective surface (FSS) for shielding the communication link of implantable devices with the external environment. The proposed shield blocks a dual‐band frequency operating at 404 MHz and 2.45 GHz in the medical implant communication service (MICS) and industrial, scientific, and medical (ISM) bands. The two distinct stop bands provide a high‐frequency band ratio of 6.02 in an ultra‐miniaturized physical form factor of 0.024λo × 0.024λo, with at least 76.96% miniaturization when compared to the existing art. Each of the unit cells is imprinted on a conformal 50 μm polyester substrate in a symmetrical configuration. The polyester adheres with jean to realize its compatibility with wearable applications. The designed shield system offers a low profile of only 0.00146λo. By suppressing the grating lobe, the proposed shield achieves a high angular stability of 80° and polarization insensitivity of 90° in both transverse electric (TE) and transverse magnetic (TM) modes. The FSS is fabricated and measured results validate its performance. To evaluate the physical insight, an equivalent circuit model (ECM) analysis is done. To ensure durability, the proposed shield system is tested with Amitech SDR04.

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Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding

Abstract: His research interests include synthesis of functional materials, printed electronics, and radio frequency devices.

Cited by 47 publications

References 53 publications

Optically Transparent and Flexible Radio Frequency Electronics through Printing Technologies

Optically Transparent and Flexible Radio Frequency Electronics through Printing Technologies

Flexible and Large‐Scale Liquid Metal Frequency‐Selective Surfaces: Enhanced Tuning through Mechanical Reconfiguration

Conformal ultra‐miniaturized frequency selective surface for medical shielding applications

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