Multi-input-multi-output (MIMO) antenna systems are used to enhance spectral efficiency and channel capacities of 5G and IoT infrastructure 1, 2. Transparent and flexible MIMO antennas serve as a key element to maintain compatibility with devices of varying shapes and sizes while minimizing their visual impact. The optical transparency may help to increase visual aesthetics of 5G-enabled base stations, smartphones, tablets and wide range of IoT devices, from environmental sensors to home automation devices. While the flexibility of the antenna design might make it suitable for integration into flexible communication modules or boards that can be adapted to various types of IoT sensor nodes and devices with different form factor. During the past few years, State-of-the-art flexible and transparent MIMO antennas have been developed using advanced nanotechnology. Researchers have explored various conductive and optically transparent materials, including AgHTs (silver-coated polymers), IZTO (indium zinc thin oxide), ITO (indium tin oxide), and graphene, for their potential use in the development of transparent and flexible antennas for wearable applications. However, AgHTs suffer from high surface resistance and low radiation efficiency for antennas 6 , 7 despite having good flexibility. Furthermore, IZTO and ITO materials are not suitable for future transparent and flexible applications due to their brittleness and high levels of loss when bent, as referenced in 8. Roll-to-roll production of monolayer graphene has been successfully demonstrated, boasting high transparency, electron mobility, and scalability. However, the transfer of large, high-quality graphene films remains a significant challenge, as mentioned in 9 and 10. You must be logged in as an administrator to make the required changes. Let us see the details. 1] Via Performance options Pradeep, P., Jaya Sankar, K. & Chandra Sekhar, P. A compact semi-circular slot MIMO antenna with enhanced isolation for sub-6 GHz 5g WLAN applications. Wirel. Pers. Commun. 125, 3683–3698 (2022).

Equation ( 1) reveals that O.T of a transparent antenna can be enhanced by increasing \('l'\) and decreasing \('w'\) due to decrease in coverage of copper, which may reduce radiation performance of antenna. So, balancing \('w'\) and \('l'\) to maximize O.T without sacrificing overall MIMO antenna performance with closely spaced antenna elements is a challenging task. Resonance frequency Desai, A., Palandoken, M., Kulkarni, J., Byun, G. & Nguyen, T. K. Wideband flexible/transparent connected-ground MIMO antennas for sub-6 GHz 5G and WLAN applications. IEEE Access 9, 147003–147015 (2021).Generally, when two antennas are placed in close proximity to each other, these tend to couple or interact with each other, which can lead to poor isolation between the antennas. To overcome this issue, some decoupling structures and techniques are usually employed in literature to achieve better isolation. However, a decoupling structure between antenna elements may cause larger separation between antennas and may also increase power loss, which may limit compactness of MIMO antenna and may also reduce radiation efficiency. Yan-Jun, S., Hao, C., Song-hang, W., Yan-Bing, L. & Li, W. Study on electromagnetic shielding of infrared/visible optical window. Mod. Appl. Sci. 9, 231 (2015). When you export your image, it will be processed as a PNG which you can save directly to your device or share on social media! This image file will have fully or partially transparent sections that you removed in the Studio, so it's ready to overlay on other images or videos or use as a custom emoji in platforms that use them.

Park, J. et al. An optically invisible antenna-on-display concept for millimeter-wave 5G cellular devices. IEEE Trans. Antennas Propag. 67, 2942–2952 (2019). You can restart your graphics driver to fix transparent or translucent box on screen in Windows 11 using either Windows shortcut or Device Manager. Here are the Detailed steps: Malek, M., Hakimi, S., Rahim, S. A. & Evizal, A. Dual-band CPW-fed transparent antenna for active RFID tags. IEEE Antennas Wirel. Propag. Lett. 14, 919–922 (2014). There are 4 applicable ways to fix the transparent or translucent box on screen in Windows 11. Way 1: Restart Graphics DriverFor example, startup processes such as driver update apps (e.g. NVIDIA GeForce Experience driver update), welcome screen, hardware companion software, notifications from programs such as Steam client (e.g. when loading for VR headset or running Big Picture Mode), antivirus or anti-malware programs, etc. could appear as a white square box on the screen when it fails to load. A center fed conventional MIMO antenna configuration with same geometrical parameters and spacing between antenna elements as those of the proposed MIMO antenna is also analyzed to verify reason for enhanced isolation due to offset fed configuration and shown in Fig. 3. Scattering parameters for the center fed conventional MIMO antenna are shown in Fig. 4b. It can be seen that the isolation for conventional center fed configuration is only 8 dB. The surface current distribution for conventional center fed MIMO antenna is also shown in Fig. 4a. It can be seen that when antenna-1 is excited and antenna-2 is matched to a 50 \(\Omega \) impedance, a symmetric current distribution is observed on antenna-1 due to center fed excitation. However a significant surface current coupling from antenna-1 to antenna-2 can also be observed, which confirms poor isolation performance for the center-fed configuration. In addition to the previous analysis, the proposed transparent MIMO antenna is evaluated for its performance using measures such as radiation pattern, Envelope Correlation Coefficient (ECC), Channel Capacity Loss (CCL), Total Active Reflection Coefficient, and Mean Effective Gain (MEG). Radiation pattern Suggested Read: How to Force Close Program in Windows 11 Without Task Manager Fix 3: Restart your PC Hong, S., Kang, S. H., Kim, Y. & Jung, C. W. Transparent and flexible antenna for wearable glasses applications. IEEE Trans. Antennas Propag. 64, 2797–2804 (2016).