Measurements on point-to-point transmission at street level were performed in downtown Denver, CO, with RF probes that operated in the upper microwave and lower millimeter-wave bands. All probes were mounted on self-contained vehicles, thus permitting a variety of path scenarios. Information on performance of SHF/EHF channels when propagating in an urban environment on both line-ofsight and non-line-of-sight paths is presented.

A propagation experiment at 96 GHz over a line-of-sight (LOS) path provided data on attenuation characteristics of atmospheric water vapor. Two consecutive time periods (three days in May and one and one-half days in August 1986) with a total of about 100 h of data on signal level and meteorological conditions were analyzed with respect to absolute humidity (3-21 g/m3) and temperature (4-32°C) variations. Experimental details, the data analysis, and a comparison with model predictions are discussed. The field experiment tends to uphold the validity of the millimeter-wave propagation model MPM.

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