Broadside Array

It is a linear array composed of half wave dipoles spaced by one half wavelength.

1. Government Engineering College, Bharuch Antenna And Wave Propagation presentation

2. Broadside Array Prepared by : X Y Z 6 th Sem (E.C-A)

3. Broadside Antenna It is a stacked collinear antenna. It is composed of half wave dipoles spaced from one another by one half wavelength. In Broadside array antenna two or more elements are usually combined in this type of antenna. Each is connected to the other antenna and also to the transmission line. The cross over transmission line ensures the correct signal phasing. This antenna produces highly directional radiation pattern. The pattern will be broadside or perpendicular to the plane of the array.

4. Construction & Working of Broad-side 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 . Hence, the radiation pattern of the antenna is perpendicular to the axis on which the array exists.

5. A broadside array looks like a ladder. A uniform broadside array is a linear array. The elements of a uniform broadside array contribute EM fields of equal amplitude and phase

6. The following diagram shows the broad side array, in front view and side view, respectively.

7. The broad side array is strongly directional at right angles to the plane of the array. However, the radiation in the plane will be very less because of the cancellation in the direction joining the center . Like collinear antenna type, broadside antenna is bi-directional in radiation. The radiation pattern has a very narrow beam width and also very high gain.

8. Broad side array with λ/4 spacing Typical antenna lengths in the broad side array are from 2 to 10 wavelengths. Typical spacings are λ/2 or λ. The feed points of the dipoles are joined as shown in the figure.

9. Frequency range The frequency range, in which the collinear array antennas operate is around 30 MHz to 3GHz which belong to the VHF and UHF bands.

10. Radiation Pattern The radiation pattern of this antenna is bi-directional and right angles to the plane. The beam is very narrow with high gain.

11. Radiation Pattern The beam is a bit wider and minor lobes are much reduced. The antenna array in its simplest form, having a number of elements of equal size, equally spaced along a straight line or axis, forming collinear points, with all dipoles in the same phase, from the same source together form the broad side array

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