Directivity
Evaluation of a Hemispherical Conformal Phase Array Antenna. By: Dr. Zamel A-K Al-Uzbaky
Abstract- Phased
array antennas consist of several radiating elements arranged and
interconnected to produce directional radiation pattern. A conformal antenna is
an antenna that conforms to something; it conforms to a prescribed shape.
Conformal 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. Conformal Array antennas have wide
application in radar and radio communication, to day arrays at microwave
frequencies and above are used extensively in mobile and satellite
communication systems.
In this paper cylindrical conformal array
antennas are considered, some significant design parameters that affect the
radiation patterns and directivity were evaluated and discussed. These
parameters includes radius of the hemispher, the number of rings M, number of
element radiators N in each ring as well as the spacing between the rings d,
and the scanning angle
,
in addition to the current excitation amplitudes and phases. A MATLAB programs
have been established to compute and plot the radiation patterns in polar plane
and in three dimensions plane(3-D) for different design parameters. A numerical
results of the directivity and half power beam width have been deduced from the
antenna pattern for different. The obtained results give to the designers a
suitable and optimal solution in the applications related to conformal phase array
antenna .
Keyword : Phase Array Antenna, Conformal Array
Antenna, Directivity.
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