A two-element array made of two λ/2 side by side dipoles with spacing equal to .125 λ , the two elements are fed by currents equal in magnitude but having a phase difference such that : I2=I1 e(j.75π) :
i- find the input resistance of each dipole (neglect self and mutual reactances).
ii- find the gain pattern of the array.
iii- sketch the gain pattern .