It is defined as the direction of electric field vector in the EM wave radiated by the transmitting antenna.
ii) Antenna Gain:-
Antenna gain is defined as the ratio of the power density radiated in a particular direction to the power density radiated to the same point by the reference antenna.
It is mathematically given by,
P = power density at some point with the given antenna
Pref = power density at same point with the reference antenna
iii)Antenna Resistance:- Radiation resistance is the AC antenna resistance and is equal to the ratio of the power radiated by the antenna to the square of the current at its feed point. It is