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Arrays of point sourcesPowerPoint Presentation

Arrays of point sources

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### Arrays of point sources

n Elements Uniform Linear Arrays of point sources

Geometric series

CASE 1:- n Elements Uniform Linear Arrays of point sources – BROADSIDE ARRARY

Thus +41.4 , -41.4 are the 4 minor lobe maxima of the array of 4 Isotropic sources, in phase, spaced /2 apart.

CASE 2:- n Elements Uniform Linear Arrays of point sources – END-FIRE ARRAY

Same Equation of Normalize resultant Field Pattern

For an array to be end fire, the phase angles is such that makes the maximum

radiation in the of array i.e. Thus for an array to be and

or 180

n=4, d=/2,

Thus +75.5 & -75.5 are the 4 minor lobe maxima of the array of 4 Isotropic sources, 180 deg out of phase, spaced /2 apart.

NOTE:- Here the complementary angle , as has been used in broadside case, is not

required. Because the beam width of a end fire array is larger than broadside.

Endfire array antenna

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