Upcoming 5G networks will operate in a higher frequency portion of the wireless spectrum: somewhere between 30 GHz and 300 GHz. Data can travel at lightning-fast speeds in this area (known to some as the ‘millimeter wave spectrum’), but it doesn’t go very far. Think of it as akin to sustaining a sprint versus a 5K race. Average speed may be far faster for a sprint, but it’s only sustained over 50 or 100 yards.

To ensure reliability, 5G broadband networks will feature far more antennas, all in the interest of avoiding obstacles. In the future, mini-antennas will be placed throughout homes and businesses to accommodate 5G devices.
To know more about 5G engineering

Or visit this link or this one