21 February 2012

Directivity Evaluation of Conformal Array Antenna By: Zamel Abud Al-Kareem Al-Youzbaki


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 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 cylinder and 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 qo, 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.

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