Application of the modal transmission-line method to radiowave propagation through building walls

The modal transmission-line (MTL) method is used to analyse the transmission coefficient of building walls, which is an important parameter for the accurate planning of microcellular mobile networks. For that, the buildings walls are modelled as multilayer periodic structures. After a description of the extended MTL theory, the newly developed MTL method is applied to reinforced-concrete walls. From a comparison of the MTL results with previously published theoretical results obtained by the finite-element method, it is concluded that the MTL method is very well suited because it is accurate as well as computational-time efficient.