What is the directivity of antenna having effective aperture 2 m²?

Power radiated by half-wave dipole with maximum current amplitude 5A is

What is the Beam area for Directivity to be 2 in Steradian?

What is the maximum power gain of antenna with radiation efficiency 96% and directive gain 1?

What is the radiation resistance of an antenna if it radiates 1kW and current in it is I _{r m s}=5A?

What is the maximum directive gain of antenna with radiation efficiency 96% and maximum power gain 1?

What is the Bandwidth of the antenna operating at resonant frequency 300MHz with Quality factor 20?

What is the radiation resistance of an antenna if input power to it is 1200W and current in it is 10A having a power loss of 200W?

If physical aperture of antenna is 0.01m² and aperture efficiency is 0.5, then what is the value of effective aperture?

What is the maximum power gain when the radiation resistance is 80Ω, loss resistance is 8Ω and the maximum directive gain is 1.5?