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Path Loss Modeling of Line-of-Sight Microwave Urban Propagation with Low-Height Antenna Mobile Stations
Koichi TAKAHASHI Hironari MASUI Satoshi TAKAHASHI Kouzou KAGE Takehiko KOBAYASHI
IEICE TRANSACTIONS on Electronics
Publication Date: 1999/07/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Microwave and Millimeter Wave Technology)
mobile communication, radio propagation, path loss, excess loss, low antenna height,
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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 dα formula instead of d2 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 dα formula to assess the path loss characteristics.