The effects of reinforced concrete walls/floors on wireless personal communications systems (PCS)

The reinforced concrete (RC) wall/door of a building is typically made up of a wire mesh embedded in a thick layer of concrete cement for structural reinforcement. The mesh may consists of straight wires joined perpendicularly to give a planar periodic array of square grid for structural reinforcement. When the array is illuminated by electromagnetic waves, its inherent periodicity would exhibit certain reflection characteristics depending on the size of the grid and the concrete properties. The paper shows that such a gridded RC structure would enhance the reflection in a wireless personal communications systems (PCS) environment. The present study gives a brief theoretical formulation for the gridded RC structure using the Floquet modal theorem and discusses its predicted reflective characteristics.