Antenna system problem

Описание: -An antenna used for transmitting has a power gain of 20, directive gain of 22, and an input power of 200 𝑊. Determine
-EIRP in 𝑊, 𝑑𝐵𝑚 and 𝑑𝐵𝑊
-Power density at a distance of 5 𝑘𝑚 from the antenna along the direction of maximum radiation.
-Antenna efficiency
Radiated power from an antenna
-Radiation resistance and antenna effective resistance if current at feedpoint is 2 𝐴.

An antenna has a radiation resistance of 80 ohms, effective (ohmic) resistance of 10 ohms, directive gain of 30, and input power of 50 watts. Determine the following:
Antenna Efficiency
-Antenna Power Gain in ratio and in 𝑑𝐵
-Radiated Power in 𝑊, 𝑑𝐵𝑚 and 𝑑𝐵𝑊.
-EIRP in 𝑊, 𝑑𝐵𝑚 and 𝑑𝐵𝑊.
-Power density 3 𝑘𝑚 away from the antenna in the direction of maximum radiation
-Antenna Current