1- A two-element array made of two /2 side by side dipoles with spacing equal to

Question

1- A two-element array made of two /2 side by side dipoles with spacing equal to .125 , the two elements are fed by currents equal in magnitude but having a phase difference such that : I2=I1 e(j.75) :

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 .

2- A medium wave antenna mast is 50 m high and is operating at 1 MHz with a top loading the effective height is equal to 45 meters :

i- find the radiation resistance .
ii- with input power = 100 Kw , find the input current given that the ground resistance = 2.5 ohm .
iii- find the radiated E field at 30 Km from the antenna .

3- A 10 GHz radio link is established between two antennas separated by 40 Km , find the necessary height of the antennas , assume equal antenna heights and standard atmospheric conditions.

Explanation / Answer

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