We performed a propagation experiment in a modem office building in Rome, Italy. The propagation measurements are based on the use of a vector network analyzer (VNA) over the band 2 - 12 GHz, with a frequency resolution of 5 MHz. We propose a novel analysis of the dependence of path loss laws on the carrier frequency and bandwidth. Our experimental results show that the path loss exponent strongly depends on the carrier frequency. The path loss exponents increase with the iincreasing carrier frequency for the line-of-sight (LOS) scenarios, while exhibit an opposite behavior for the non-line-of-sight (NLOS) data. We explain this behavior by the frequency dependence of the reflection coefficient of the walls surrounding the transmitter. Indeed, the lowest frequencies (2 - 5 GHz) are reflected, while the hlghest frequencies (up to 12 GHz) pass through the walls.
The role of path loss on the selection of the operating bands of UWB systems
CASSIOLI, DAJANA;
2004-01-01
Abstract
We performed a propagation experiment in a modem office building in Rome, Italy. The propagation measurements are based on the use of a vector network analyzer (VNA) over the band 2 - 12 GHz, with a frequency resolution of 5 MHz. We propose a novel analysis of the dependence of path loss laws on the carrier frequency and bandwidth. Our experimental results show that the path loss exponent strongly depends on the carrier frequency. The path loss exponents increase with the iincreasing carrier frequency for the line-of-sight (LOS) scenarios, while exhibit an opposite behavior for the non-line-of-sight (NLOS) data. We explain this behavior by the frequency dependence of the reflection coefficient of the walls surrounding the transmitter. Indeed, the lowest frequencies (2 - 5 GHz) are reflected, while the hlghest frequencies (up to 12 GHz) pass through the walls.Pubblicazioni consigliate
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