Determine the directivity in decibels for an antenna that produces a power density P = 4 micro W/m^2 at a point in space when a reference antenna produces 0.4 micro W/m 2 at the same point. Determine the power gain in decibels for an antenna with a directive gain of 50 dB and an efficiency of 75% Determine the power captured by a receiving antenna for the following parameters: Power radiated Pin- 100 W Transmit antenna directive gain At= 40 dB Distance between transmit and receive antenna d = 40 km Receive antenna directive gain Ar = 23dB