Achieving optimal performance for multiple parameters simultaneously is a formidable task. Notably, there is still no significant work available in literature that is simultaneously focused to achieve desired optical transparency and flexibility for a MIMO antenna with closely spaced antenna elements. Optimization to achieve required transparency, flexibility, resonance frequency, impedance matching, isolation and radiation performance simultaneously, is a distinct and complex challenge because these performance metrics varies with the variation of the parameters of the square lattice of the wired metal mesh to achieve desired transparency as well. Dragoman, M. et al. A tunable microwave slot antenna based on graphene. Appl. Phys. Lett. 106, 153101 (2015). 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. You can reinstall Display adapters to fix transparent or translucent box on screen in Windows 11. Here is the guide: When done, it will let you configure and use this setting for the appearance and performance of Windows on your computer.

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). Hashiba, J., Kawajiri, T., Shibuya, R. & Ishikuro, H. Shield effects of metal plate and mesh in wireless power delivery system. Proc. 2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) 235–237 (IEEE, 2015).The \('w'\) and \('l'\) parameters also directly impacts impedance matching (S11 and S22) of each antenna element. It can also be observed that impedance matching of MIMO antenna elements varies randomly with variation of square lattice parameters. So, careful \('w'\) and \('l'\) adjustments are also needed to achieve proper impedance matching as well as required optical transparency. Isolation Suggested Read: How to Force Close Program in Windows 11 Without Task Manager Fix 3: Restart your PC 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

Altering \('w'\) and \('l'\) values also affects the resonance frequency of each antenna element. Precision control of these parameters is necessary to achieve desired resonance frequency. Precisely managing \('w'\) and \('l'\) for accurate resonance frequency control is another challenge. It can be observed that increasing \('l'\) can lower the resonance frequency, while increasing \('w'\) may raise it. So, striking the right balance is crucial. Impedance matching The \('w'\) and \('l'\) adjustments also influence the coupling between antenna elements. Sensitivity in \('w'\) and \('l'\) is required to optimize isolation. It can be derived in general from above parametric analysis that the isolation (S21 and S12) between antenna elements decreases with increase in \('w'\) and \('l'\). So, careful fine tuning of these parameters also needed to achieve desired isolation as well as other performance metrics. The use of metallic mesh (MM) has been viewed as a promising technique for transparent and flexible applications owing to its superior transparency, conductivity, and malleability. The full potential of MM structures in contemporary radio frequency devices has not been completely investigated yet. In general, micro-structured MM films have found applications in solar cells, electromagnetic interference shielding 11, and all-solid-state supercapacitors 12. However, there are only a few reported instances of stiff antennas using MMs as conductive electrodes in RF devices. There were reports of low efficiency and poor transparency in these MM antennas, as indicated in 13 and 14. Grande, M. et al. Gain and phase control in a graphene-loaded reconfigurable antenna. Appl. Phys. Lett. 115, 133103 (2019). Figure 7 displays the simulated and measured radiation patterns in both orthogonal planes at 4.5 GHz for one of the elements of the transparent patch antenna.In Fig. 5, parametric analysis is presented to investigate the effect of the square lattice dimensions \('w'\) and \('l'\) of a wired metal mesh on optical transparency, resonance frequency, impedance matching (S11) and isolation (S21). The parametric analysis performance is also summarized in Table 2. The purpose of this analysis is to demonstrate optimization steps for square lattice dimensions of the wired metal mesh to optimize performance of a MIMO antenna with closely spaced antenna elements, while maintaining suitable optical transparency and flexibility. Optical transparency In this work, the offset edge fed plays a crucial role in achieving higher isolation between the patch antenna elements and good impedance matching.The fed point for both of the antennas is intentionally shifted or offset from the center of the antenna elements. By optimizing the offset position of the edge fed, higher isolation between the closely spaced patch elements as well as required impedance matching for each antenna and feed line can be achieved. Step 3: Select the Uninstall device option, and then select the Attempt to remove the driver for this device box.

You must be logged in as an administrator to make the required changes. Let us see the details. 1] Via Performance options 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. 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). Jensen, M. A. & Wallace, J. W. A review of antennas and propagation for MIMO wireless communications. IEEE Trans. Antennas Propag. 52, 2810–2824 (2004). 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).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). I agree that this doesn’t actually resolve the root of the problem, but if you are in a rush, restarting your computer may temporarily get rid of the white blank box issue in Windows 11. If the weird white box appeared out of no where, a restart often fixes the issue right away. Fix 4: Disable startup programs you don’t need