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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 . For example Let /2 ; . = 60 or 120. For example Let /2 ; . Then . if m=1.

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slide12

For example

Let /2 ;

= 60 or 120

slide14

For example

Let /2 ;

Then

if m=1

slide15

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

slide19

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

slide27

For example if

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.

slide28

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.

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