A study of field strength height profiles caused by multipath fading

The height dependence of the field strength was studied on a line-of-sight link, 43 km in length, at 9.3 GHz. At the receiving site, 14 antennas were mounted one above the other at 2 m spacing. Height profiles with deep fades or marked enhancements of the signal caused by multipath propagation were investigated. The parameters of a propagation model with two or three partial waves were evaluated from the measured data. These parameters were the amplitudes, the differences of the angles of incidence, and the phase differences. Only a small part of the events is covered by the two-path model. The three-path model proves to be much more adapted to this purpose.