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Difference between Broadside and End fire array
In this post, we will see & learn about the basic difference between Broadside and End fire array. First of all the basic definitions of broadside and end-fire array.
Broadside Array
Broadside array is an array that gives a radiation pattern whose main beam is perpendicular to the axis of the array.
In a wider sense, broadside array is a linear or a planar array antenna whose direction of maximum radiation is perpendicular to the line or plane of the array.
End-fire array
An end-fire array is an array that gives a radiation pattern whose main beam is along the axis of the array.
In a wider sense, the end-fire array is a linear or planar antenna whose direction of maximum radiation is along the line or in the plane of the array.
Difference between Broadside and End fire array
| S.No. | Broad side array | End fire array |
| 1. | The array is said to be broadside array if the direction of maximum radiation is perpendicular to the array axis. | The array is said to an end-fire array if maximum radiation is along the array axis. |
| 2. | In broad side, phase difference α = 0 | In end fire, phase difference between adjacent element is α= -βd |
| 3. | General equation for pattern maxima is (θmax)minor=cos-1 | General expression for pattern maxima is, (θmax)minor=cos- |
| 4. | general Expression for pattern minima is, (θmax)minor=cos-1 П | Genaral expression for pattern minima is, θ min =2sin-1 |
| 5. | Half power beamwidth is given by, HPBW= degree | Half power beamwidth is given by, HPBW=53.3 |
| 6. | Directivity of broad side array is , D=2 | Directivity of end fire array is, D= 4 |
| 7. | Beamwidth between first nulls is, BWFN= degree | Beamwidth between first nulls is BWFN=114.6 degree |
| 8. | In broad side array, all elements are equally spaced along the array axis and fed with current of equal magnitude and same phase. | In End fire array, all elements are equally spaced along the array axis and fed with current of equal magnitude but their phases are different. |
| 9. | The radiation pattern of the broadside array is bidirectional | The radiation pattern of the broadside array is Unidirectional |
| 10. | In broad side array, φ =βdcosθ+α (since α=0) Therefore φ =βdcosθ | In end fire array, φ =βdcosθ+α (since α=-βd) Therefore φ =βd(cosθ-1) |
