Far Field Pattern Calculation for Antenna Array with Displacement and Rotation of Elements Using Characteristic Mode Analysis

In practice, mechanical errors of the array antenna affect its radiation performance. This paper proposes a method of calculating distorted array antenna radiation pattern based on the theory of characteristic mode (TCM). This method simultaneously considers the translation error and posture deflection error of array elements. A 9*5 array antenna is taken as example to verify the correctness of this method.