Interaction of Yagi-Uda Antennas in Antenna Arrays

The results of modeling of transmission coefficient between two Yagi-Uda antennas in antenna array are discussed in this article. The transmission coefficient S₂₁ versus wave like distance between antennas and directors number are analyzed by moment method (MoM). Both E-plane and H-plane interactions are analyzed. Tree methods for the calculation of the antenna array radiation pattern subject to interactions are discussed. The radiation pattern for full antenna array calculated by MoM. It is the first method. In the second method the radiation pattern of one active irradiator subject to other irradiator is passive, and MoM calculates it. In the third method the full antenna array is decomposed to three fragments per tree irradiators. MoM calculates the antenna pattern of one fragment subject to all (three) irradiators. The pattern of full array is calculated by theorem of antenna pattern multiplication, but system factor calculated for array consist of three fragments. One can see, that all proposed methods allow achieving the same results