Question

A lossless antenna with directive gain of 8 dBi is fed with a 2 W power. The total radiated power of the antenna will be:
i. 16 W
ii. 8 W
iii. 4 W
iv. 2 W

Answer 1

The directive gain of the antenna cannot cause more total power to be radiated than the power fed to it. The directive gain concentrates the radiated power in specific directions, but reduces the radiated power in other directions relative to an isotropic antenna.