Experimental investigation of controlling coverage of wireless LAN by using partitions with absorbing board

For a wireless communication system to work effectively without electromagnetic interference, the electromagnetic environment needs to be controlled. We experimentally investigated methods for controlling the electrical field strength and the delay spread so as to achieve communications without electromagnetic interference in selected regions for a 2.4-GHz-ISM-band wireless LAN system. Several indoor environments in which partitions with electromagnetic absorbing board were placed around desks were used. The transmission loss and delay spread were investigated experimentally, and the BER and throughput characteristics were measured. We found that the coverage of a wireless LAN could be controlled by using partitions with absorbing boards. We identified several requirements for controlling the coverage that should be useful in designing indoor wireless communication systems