Abstract
Phased
array antennas consist of several radiating elements arranged and
interconnected to produce directional radiation pattern.
Array
antennas have wide application in radar and radio communication, to day arrays
at microwave frequencies and above are used extensively in mobile and sat
communication systems.
The
phased array antenna offers a unique capability of electronic scanning of the
main beam in the space by changing the phase of the exciting currents in each
element of the array.
Array
antennas can be classified according to their distribution such as linear,
planar, circular and conformal array.
In this
thesis all types of array are considered, some significant design parameters
that affect the radiation patterns and directivity were evaluated and
discussed. These parameters includes shapes, dimensions of the antenna array,
as well as the number of the radiating elements, in addition to the current
excitation amplitudes and phases.
A
mat-lab programs have been prepared to compute and plot the radiation patterns
and their directivity in three dimensions and in tow dimension for various
cases of the design parameters.
A
numerical results of the directivity and half power beam width with the
variation of the different design parameters can give the suitable and optimal
solution of the array antenna design for different application.
Application
of array was considered in the base station of the mobile system for an
objective to increase revers link capacity by using adaptive circular array
antenna.
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