Transparent 5.8 GHz filter based on graphene

Wang, Jinchen; Guan, Yifei; He, Shiyuan

doi:10.1109/mwsym.2017.8058955

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…where ρ is the resistivity of ITO films. Equations (1) and (3) show the tradeoff between optical transparency and sheet resistance, illustrating that thinner ITO film results in higher optical transparency, but larger sheet resistance. Therefore, thin films with a smaller sheet resistance are usually obtained at the expense of losing a certain transparency.…”

Section: Antenna Design and Configurationmentioning

confidence: 99%

“…For instance, these devices are relatively thicker and heavier, and also they are not suitable for applications requiring optical transparency, such as windows, display panels, and solar cells. Therefore, in recent years the microwave components designed with transparent and conductive thin films printed on transparent substrates have obtained great interest from researchers [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Another example of using optically transparent antennas in solar applications is described in [2], where a reflectarray is proposed by using transparent and conductive films (TCFs). The most commonly used TCFs include fluorine-doped tin oxide (FTO), silver-coated polymer (AgHT), graphene, and indium tin oxide (ITO) [1,4,6]. Optically transparent devices possess the merits of low thickness, light weight, high optical transparency, and aesthetic value.…”

Section: Introductionmentioning

confidence: 99%

“…Optically transparent devices possess the merits of low thickness, light weight, high optical transparency, and aesthetic value. The realization of optically transparent devices will solve many issues in military and civilian areas including solar energy harvesting applications, and they have been applied in filters, absorbers, antennas, reflectarrays and so on [1][2][3][4]7].…”

Section: Introductionmentioning

confidence: 99%

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An On-Glass Optically Transparent Monopole Antenna with Ultrawide Bandwidth for Solar Energy Harvesting

Cai

2019

Electronics

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An on-glass optically transparent monopole antenna with ultrawide bandwidth is presented in this work, and the proposed antenna is of ring shape and coplanar waveguide fed structure. Optically transparent indium tin oxide (ITO) thin film with a thickness of ~160 nm is used as the conductive layer, which is sputtered on an optically transparent glass substrate. An impedance bandwidth of 6 GHz from 1 to 7 GHz is achieved, with a return loss lower than −10 dB, meaning a fractional bandwidth of 150%. The proposed antenna exhibits reasonable radiations of omni-directionality in the H plane and bi-directionality in the E plane. Like other transparent antennas discussed in literature, the antenna gain is relatively low (−4 dBi at 5 GHz). In order to optimize the antenna performance, multi-film approach is proposed to reduce its sheet resistance, and the result shows that the antenna gain at 4 GHz can be improved from −8 dBi to 5 dBi when optimizing the sheet resistance from 10 Ω/sq to 0.01 Ω/sq. The designed antenna possesses a high optical transparency, which makes it easy to integrate to the surface of windows or display panels, and it can be applied for solar energy harvesting and many other ultra-wideband applications, with little chance of detection.

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Section: Antenna Design and Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An On-Glass Optically Transparent Monopole Antenna with Ultrawide Bandwidth for Solar Energy Harvesting

Cai

2019

Electronics

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“…However, the metal mesh film structures presented in previous studies do not have a sufficiently satisfactory microwave performance to support the development of a low-loss transparent bandpass filter. Wang et al first proposed an optically transparent graphene microstrip bandpass filter [9]. However, the use of a complicated manufacturing process, the use of an expensive material, and the incompatibility with the standard semiconductor process for fabricating the graphene-based filter must be overcome.…”

Section: Introductionmentioning

confidence: 99%

New Transparent Bandpass Filter Using Aluminum Thin-Film Micromesh Structure

Tai

Lin

et al. 2019

IEEE Access

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In this study, we present the new transparent coplanar waveguide (CPW) bandpass filter using aluminum (Al) thin film micromesh structure. The filter is prepared by the semiconductor process of dc sputtering and standard lift-off technology. In order to achieve the high-performance transparent bandpass filter, the new aluminum thin film micromesh structure with low resistivity to 10 −8 -cm, uniform Al thin film thickness to 3µm, high optical transparent to 78% and simple manufacturing process has been proposed. The transparent bandpass filter is designed at 2.4 GHz with 3-dB fractional bandwidth (FBW) of 5%, the minimum insertion loss (−20 log |S 21 |) of 1.8 dB and the return losses (−20 log |S 11 |) of 25 dB. The simulated and measured results of the transparent bandpass filter are in good agreement. The proposed transparent bandpass filter is showing a simple coplanar waveguide configuration, low thin film resistivity, high thin film transmittance, high filter performance, and small circuit size.

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