Effects of polarization, antenna directivity, and room size on delay spread in LOS indoor radio channel

This paper presents results of experiment and computer simulation based on a three-dimensional (3-D) ray-tracing method for various directional polarized antennas, where the effects of polarization, antenna directivity, and room size on delay spread (measured at 94 GHz) are investigated in the line-of-sight (LOS) indoor channel. These results indicate that the delay spread can be reduced significantly by the directional circularly polarized antenna. It is also found that the delay spread increases almost proportionally with the square root of the room floor area.