Telekom said it was the first use of the technology in a real world setting in Europe, with speeds of more than 2 gigabits per second to a customer device, as well as a latency of 3 milliseconds on commercial sites.
The antennas are manufactured by China's Huawei Technologies Co Ltd [HWT.UL].
"This is a very decisive developmental step on the way to the global launch of 5G, which is planned for 2020," Telekom board member Claudia Nemat said in a statement.
When Telekom starts commercial rollouts of 5G networks in 2020, it is expected to be in slices of new bandwidth to enable specialised services for connected cars, pre-booking parking spots and even smart trash cans.
Europe is expected to take a slower approach to 5G network deployments than operators in South Korea and Japan, where rollout is due next year, followed quickly by the United States where Telekom is the majority owner of No. 3 ranked mobile carrier T-Mobile.
(Reporting by Emma Thomasson; editing by Jason Neely)