Simple Calibration Technique for Arrays with Single-mode Elements Based on Mutual Impedance Matrix

Recently, applications of high-resolution Direction-of-Arrival (DOA) estimation with an array have been increasing including position estimation in smart antenna and RF-ID system. To realize high-resolution capability, superresolution technique such as MUSIC algorithm is often adopted. However, precise array calibration is necessary to realize essential performance of the algorithm. In this report, we propose a new simple calibration technique based on impedance matrix of the array. In this technique, number of the adjusted parameters, or unknowns, becomes only one for uniform array when its mutual impedance matrix is known. Performance of the proposed technique is verified by numerically and experimentally