Since the rollout of 5G networks in 2018 or 2019, the need for more base stations to support the higher frequencies required for faster connections has led Japanese companies to develop transparent glass antennas that turn windows into base stations. This innovative technology, created by AGC and NTT Docomo, offers a solution to the challenge of installing more visible equipment in shared spaces. The transparent antenna uses conductive materials sandwiched between glass sheets to improve durability and reduce the disruption of radio signals passing through the window. This advancement in 5G infrastructure could potentially expand coverage and improve connectivity for users.
https://spectrum.ieee.org/5g-antenna-transparent-window