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Broadside Antenna Array. A type of arrangement of multiple identical elements that are placed parallelly along the line normal to the antenna axes forms a broadside antenna array. It is known to be a practical antenna array configuration which is most widely used. The figure below represents the broadside arrangement of antenna array:
According to the standard definition, “An arrangement in which the principal direction of radiation is perpendicular to the array axis and also to the plane containing the array element” is termed as the broad side array.
At broadside, there is a maximum area. As the angle moves away from broadside, the area visible reduces following a cosine function. The array factor, G A (θ), was used for a 16-element linear array, with a λ/2 spacing, and a uniform radiation pattern.
LECTURE 13: LINEAR ARRAY THEORY - PART I (Linear arrays: the two-element array. N-element array with uniform amplitude and spacing. Broad-side array. End-fire array. Phased array.) 1. Introduction Usually the radiation patterns of single-element antennas are relatively wide, i.e., they have relatively low directivity.
Some antenna arrays are connected so as to produce several independent beams oriented in different directions simultaneously; phased array radar antennas and cellular telephone base stations are common examples.
2.1 Directivity of a Broadside Linear Array The maximum directivity (which occurs in the broadside direction) of a uniformly excited ESLA can be found as follows. First, the normalizedarray factor is (AF) n= sin(N 2 kdcosθ) Nsin(1 2 kdcosθ). (19) If d≪λ, we can employ the small angle approximation for the denominator, yielding (AF) n≈ ...
Array Factor of Linear Arrays with Nonuniform Amplitude Distribution. Let us consider a linear array with an even number (2M) of elements, located symmetrically along the z-axis, with excitation, which symmetrical with respect to z = 0 . For a broadside array ( β = 0) , 1 3 2 M − 1.
Antenna array can be designed so that the constructive and destructive interference in the far eld can be used to steer the direction of radiation of the antenna, or the far- eld radiation pattern of an antenna array.
Arrays of antennas are used to direct radiated power towards a desired angular sector. The number, geometrical arrangement, and relative amplitudes and phases of the array elements depend on the angular pattern that must be achieved.
The idea of antenna array design is to make the main lobe of the pattern to be much higher than the side lobes so that the radiated power of the antenna is directed along the main lobe or lobes rather than the side lobes.
