1.A base stationcellular communicationsystems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm^2) at a distance of 100 meters? This will determine the safe level for human exposure to electromagnetic radiation.
2.The radiation intensity is represented by
U = U. sin(π sin θ), 0 ≤ θ ≤ π/2 and 0 ≤ φ ≤ 2π
= 0 elsewhere
Find the directivity