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need some help answering antenna questions

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MilK

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antenna question...

hi,

need some help answering some antenna questions...

2 isotropic radiators at x = -d and x = +d on the horizontal x-y plane. for primary radiation lobes to be in +/- y directions, the radiators are fed by 100Mhz sources having equal amplitudes with no phase difference.

1) a strong signal is arriving from distant radar station at φ = 60 deg.( φ is angle with x-axis). find value of d for minimize interference posed by distant radar station.

2)determine the power levels in the side lobes(if any) relative to the power in each primary lobe.

3)the 2 isotropic radiators are replace with 2 half-dipoles(with their axes vertical to x-y plane) does the result of part 1 & @ need to be re-computed?

thks in adv
 

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