No abstract

as an essential part of the IoT network has attracted much attention in many areas such as wearable applications. Fully optical transparency becomes one of the necessities for these devices, e.g., a recent study reported an under-screen transparent antenna array, which was utilized in the assembly of next-generation cellphones. [1] The real-time noninterruptive transparent and flexible wireless communicational devices are needed in a wide range of scenarios. For example, transparency is in exact need in applications such as smart contact lenses for not blocking the user's vision while enabling the noninvasive method for continuous medical diagnosis. [2,3] Furthermore, on top of transparency, flexibility is also a very important ingredient, especially for wearable devices. Excellent flexibility of such wireless electronics is also necessary in order to closely match the curvature of the eyeballs, reducing the discomfort of patients. [4] To fabricate transparent and flexible wireless devices, the main challenge remains the realization of transparent and flexible antenna. Therefore, the demand of transparent and flexible antenna has been rapidly growing in recent years.The demand of emerging transparent and flexible wireless electronic devices is ever-increasing for Internet of Things (IoT) scenarios, like noninvasive healthcare, real-time wearable electronics, etc. However, as an essential part of the IoT wireless communicational devices, radio frequency (RF) antennas are still hampered by poor-flexibility, low-conductivity, and weaktransparency. Here, based on the unique electronic and optical properties of graphene, a method to obtain these appealing features concurrently through promoting synergistic effect between two-dimensional (2D) and one-dimensional (1D) materials is studied. It is found that this method could not only successfully maintain transparency and flexibility, but also greatly enhance the overall performance of the antenna. The fabricated antenna exhibits a 75% light transmittance, from 5.6 to 12.8 GHz ultrawide bandwidth and outstanding durability and stability. Moreover, a transparent and flexible radio frequency identification (RFID) tag is also designed and demonstrated with a remarkable reading distance. These findings show that the method by promoting synergistic effect of hybrid materials has great potential in the design of next generation novel and high-performance wireless electronics.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

Dual-band meander line antennas for radio location and 5G are successfully demonstrated with carbon nanotubes, graphene flakes and Ag nanowires.