Spherical array of annular ring microstrip antennas Z. A. Ahmed, W. A. Godaymi.

Abstract EN

The paper discusses the analytical study of spherical arrays of annular ring micro strip antenna (ARMSA) elements excited by electric dipole.

A new empirical relation for calculating the nonunifrom current amplitude distributions of these elements has been obtained.

The relation contains the information about the current amplitude factor ( ) Δ of the antenna elements of the spherical array.

The narrow beam width and low side lobe levels can be obtained by choosing appropriate the current amplitude factor.

It is found that for current amplitude factor ( ) 5.0 = Δ the radiation pattern have narrow beam width and low side lobe levels compared with uniform current distribution array.

Circular polarization is realized by this study depends on the spherical array geometry.

By using appropriate phase of each antenna elements in spherical arrays, radiation pattern is steered without change of gain and beam width.