Roll-to-Roll Printed Transparent Applique Antennas

Song, Hang; Schaffner, James H.; Bekaryan, Arthur; O’Connor, Kevin; Tombs, T. N.; Talty, Timothy; Carper, Duane; Yasan, Eray

doi:10.1109/apusncursinrsm.2018.8608397

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…On the other hand, Metal Mesh (MM), as one of the TCFs, has been mainly used in touch sensors on display and electromagnetic shield in the past. Recently, the use of MM to design transparent antennas has gained increasing attention from the industry owing to its low resistivity [1], [2], [7], [8], [27], [28], [29], [30], [31]. MM can be made from manufacturing methods, such as subtracting method by photo-lithography, additive method by plating up, printing, transfer method, etc., these process similar to the general fine pattern for PCB or Integrated Circuit (IC) manufacturing.…”

Section: B Transparent Conducting Films and Metal Meshmentioning

confidence: 99%

Optically Transparent Antenna for Smart Glasses

Morimoto

Shiu

Huang

et al. 2023

IEEE Open J. Antennas Propag.

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The optically transparent antenna technology has been gaining attention in consumer electronic industry owing to its potential to release the antenna volume constraints in compact mobile devices. Earlier studies have been heavily focused on the transparent antenna integration to the display for smartphone applications, for example, to improve its spatial coverage of 5G mm-wave at the forehead side. To our knowledge, the application of the transparent antenna technology to smart glasses and augmented reality glasses, especially considering the constraints from the coexistence with optical features in the lens stack-up, has remained unexplored. Thus, for the first time, we suggest a feasible existence solution between antennas and the RF lossy layers in the lens stack-up, to reduce the negative impacts on antenna performances. A slot loop antenna formed by metal-mesh based transparent antenna film and metallic glass frame has been investigated. Experimental results of such an antenna on human head phantom shows a total efficiency better than −4.5 dB in 2.4 GHz band. Even though it is demonstrated through a 2.4 GHz antenna example, the same principle can be applied to any other sub-6 GHz antenna applications, i.e., LTE, WiFi, GNSS, etc.

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Section: B Transparent Conducting Films and Metal Meshmentioning

confidence: 99%

Optically Transparent Antenna for Smart Glasses

Morimoto

Shiu

Huang

et al. 2023

IEEE Open J. Antennas Propag.

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“…Typically, the mesh structures require a line width of less than 30 µm to become optically transparent. [ 69,108 ] Such a fine resolution is beyond the abilities of some of the printing technologies. Traditionally, printing technologies, such as inkjet, EHD, flexographic, and gravure printing, have been used to print metal nanoparticles‐based transparent meshes.…”

Section: Printable Materials For Transparent Rf Electronicsmentioning

confidence: 99%

“…The sheet resistance of the resulting meshes can be lowered to tens or hundreds of mΩ sq −1 . [ 69,108,122,123 ] For example, Cui and co‐workers [ 124 ] proposed a strategy to produce metal meshes with a sheet resistance less than 1 Ω sq −1 at a transmittance of 88% via the combination of nanoimprinting and coating, which is completely compatible with R2R process. Another work from Kodak demonstrated micro‐wire structures, which were fabricated by the flexographic printing of a seed layer and electroplating of the Cu layer.…”

Section: Printable Materials For Transparent Rf Electronicsmentioning

confidence: 99%

“…Meanwhile, the sheet resistance is about 0.3 Ω sq −1 (corresponding to an electrical conductivity of 2.5 × 10 6 S m −1 ). [ 69,108 ] Chen and co‐workers [ 122 ] fabricated a high‐performance Cu mesh via a combination of imprinting, blading, and selective electroplating (Figure 6e), which are all compatible with R2R process. The produced Cu mesh had fine features with a line width down to 4 µm, exhibiting ultra‐high electrical and optical performance with an ultra‐low sheet resistance of 0.03 Ω sq −1 at an optical transmittance of 86%.…”

Section: Printable Materials For Transparent Rf Electronicsmentioning

confidence: 99%

“…R2R printing technologies have been reported for the mass production of transparent antennas as well. Song and co‐workers [ 108 ] presented an optically transparent long‐term evolution (LTE) antenna, fabricated via R2R flexographic processes. The high‐conductivity metallic meshes had a sheet resistance of ≈0.4 Ω sq −1 , ensuring an antenna gain that was 2 dB less compared with the solid metal counterpart.…”

Section: Printed Transparent Rf Electronicsmentioning

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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