Cellular Signal Loss Through Concrete Walls

Cellular phones uses radio waves to communicate. It is observed that when inside a closed structure, there is a drop in cellular signal strength. Structures are usually built with concrete walls. To test if concrete affects the cellular signal strength, the researcher tested four types of concrete walls with different wall thickness, specifically 75 min, 1OO mm, 125 mm, and 150 mm. The first series oftests were conducted inside the four concrete samples at ground ]evel. The following day, another series of tests were done outside the concrete samples made, still on ground level. Another series of tests were conducted inside the fourconcrete samples atunderground level. And lastly, series oftests conducted outside the four concrete samples at underground level. Applying t-tests to compare the cellular signal strength inside and outside the four concrete walls, results showed that there is a significant difference between the inside and outside cellular signal strength of concrete walls. The cellular signal strength is lesser when inside the concrete wall. Results also showed that there is a significant difference between the inside cellular signal strength of the four concrete samples with different wall thickness. The thicker the wall, the lesser the cellular signal strength acquired. Results also showed that there is a significant difference between the cellular signal strength at ground and at underground level. Cellular signal strength is lesser at underground level than at ground level.