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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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Arrays of point sources

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


Arrays of point sources

For example

Let /2 ;

= 60 or 120


Arrays of point sources

For example

Let /2 ;

Then

if m=1


Arrays of point sources

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


Arrays of point sources

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


Arrays of point sources

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.


Arrays of point sources

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
Endfire array antenna