SOLVED Numerical's - Antenna Theory - Page 2.
3) A certain antenna with an efficiency of 95% has maximum radiation intensity of 0.5 W/sr. Calculate its directivity when (a) The input power is 0.4 W (b) The radiated power is 0.3 W SOLUTION: a) P rad = η r P in = (0.95) (0.4) = 0.38 4) Evaluate the directivity of an antenna with normalized radiation intensity SOLUTION: 5) Determine the maximum effective area of a Hertzian dipole of length 10 cm operating at 10 MHz. If the antenna receives 3 µW of power, what is the power density of the incident wave? SOLUTION: For the hertzian dipole, G d = 1.5 sin 2 θ By definition, P r = A e P ave