Automatic Design of Uncorrelated Antennas Using Theory of Characteristic Mode

In this work, a simple and efficient method to design uncorrelated antennas automatically is proposed based on the theory of characteristic mode, which set no limits on the shape of the antennas. Through theoretical derivation, we relate the correlation between antennas to the feeding vectors of the antennas, and provide guidelines for designing uncorrelated antennas. Beginning with the platform of a mobile handset and the excitation of the first antenna, the feeding of the other antennas, which can provide the least correlation with the predetermined ones, can be calculated numerically, until the maximum number of the antennas is achieved. Following the procedure, a multi-antenna system is designed step by step for the mobile handset at the center frequency of 2.6 GHz.