Design of smart antenna using planar phased-array antenna for wireless communication systems

The consideration of smart antenna system using an 8×8 planar phased-array antenna offers the synthesis of a needed beam pattern which is not obtainable with a single patch antenna element. In this research work, a high performance planar phased-array antenna has been designed using an 8×8 square grid of z-controlled antenna monopoles with a length of 0.482λ. The considered element spacing is 0.315λ and the average directivity of 22.0 dBi. The uniform current distributions and binomial current distribution has been used for the design. To minimize the side lobe level characteristic to a lower one of -20 dB with reference to the main beam, the binomial current distribution is preferred for the work. This approach for the synthesis of antenna´s beam pattern reduces multiple interferences by installing nulls in the course of signals interference and putting the central beam pattern in the track of the targeted signals in phase and amplitude regulation.