Question

9) A cell phone in a poor signal strength area is broad one in a poor signal strength area is broadcasting a signal of frequency . with a power of 2.95 W. The signal is broadcast omnidirectionally. a) Determine the intensity of the signal at a distance of 1.25 km from the cell phone. Determine the inter b) Determine the intensity of the signal at a distance of 5.75 cm from the cell phone the caller's head). nude Determine the rms magnitude of the electric field at a distance of 5.75 cm from the cell phone.

Answer 1

2.95V (250m 0. 15 x l0Wm I A 2.95W 5.75xl0 I 892.24 W/m2 A c) FLEms -CE E I I CE 2 2. 892.24 W/m2 Erns E C 8.85xl012 3x108 Erms 579.71 v/m Dy

Answer 2

The mobile station is located at the cell boundary. The radius of the cell is 2 km. The distance to the cell using the same frequency is 12 km. The link requires a minimum of 18dB to operate. Calculate the S/I ratio (γ = 4, N = 12) to find if that power is achieved