Radio Propagation in an Office Environment at 140 GHz and 28 GHz

In this paper, we compare the radio propagation channel characteristics between the 28 and 140 GHz bands in an open office environment and provide reflection/penetration losses of several common materials in the office obtained from measurements at these two frequencies. The paper concludes that the excess loss, i.e. the loss additional to Friis free space path loss, is very similar between 28 and 140 GHz as long as the measurements are conducted in open areas. In closed meeting rooms the excess loss is drastically increased due to the noticeably higher wall penetration losses at 140 GHz.