Branch : Computer Science and Engineering
Subject : Wireless Communication
Signal Penetration into Buildings
Signal Penetration into Buildings
- The signal strength received inside of a building due to an external transmitter is important for wireless systems that share frequencies with neighboring buildings or with outdoor systems.
- RF penetration has been found to be a function of frequency as well as height within the building.
- The antenna pattern in the elevation plane also plays an important role in how much signal penetrates a building from the outside
- Measurements in Liverpool showed that penetration loss decreases with increasing frequency. Penetration attenuation values of 16.4 dB, 11.6 dB, and 7.6 dB were measured on the ground floor of a building at frequencies of 441 MHz, 896.5 MHz, and 1400 MHz, respectively
- Measurements by Turkmani showed penetration loss of 14.2 dB, 13.4 dB, and 12.8 dB for 900 MHz, 1800 MHz, and 2300 MHz, respectively.
- Measurements made in front of windows indicated 6 dB less penetration loss on average than did measurements made in parts of the buildings without windows
- According to Walker results showed that building penetration loss decreased at a rate of 1.9 dB per floor from the ground level up to the fifteenth floor and then began increasing above the fifteenth floor
- Turkmanireported penetration loss decreased at a rate of 2 dB per floor from the ground level up to the ninth floor and then increased above the ninth floor
- Measurements have shown that the percentage of windows, when compared with the building face surface area, impacts the level of RF penetration loss, as does the presence of tinted metal in the windows
- Metallic tints can provide from