arrays of point sources
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
(𝝓𝒎𝒂𝒙 )𝒎𝒊𝒏𝒐𝒓=𝐜𝐨𝐬−𝟏{± 𝝀(𝟐𝒎+𝟏)𝟐𝒏𝒅 }
For example Let /2 ;
Then
if m=1
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 maximumradiation in the of array i.e. Thus for an array to be and or 180
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.
For example if n=4, d= /2,
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.
Broadside array antenna
Endfire array antenna
Parasitic array antenna
Collinear array antenna