Path Loss Modeling of Line-of-Sight Microwave Urban Propagation with Low-Height Antenna Mobile Stations (Special Issue on Microwave and Millimeter Wave Technology)

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A model that combines free-space loss (proportional to the square of distance d) and excess loss has been known to assess the microwave line-of-sight (LOS) path loss in street microcell environments. The excess loss represents the effects of shadowing obstacles. We measure the path loss at the 3.35, 8.45, and 15.75 GHz frequencies in an urban environment, and analyze the distance characteristics of the pass loss for mobile antenna heights of 2.7, 1.6, and 0.5 m. Results show that using a new model that bases on a d^α formula instead of d^2 in the conventional model produced a better fit to the measured data. They also show that lowering the mobile antenna to a height of 0.5 m made it possible to virtually ignore the excess loss factor and, instead, use the d^α formula to assess the path loss characteristics.
社団法人電子情報通信学会の論文
1999-07-25