New mutual coupling compensation method and its application in DOA estimation

Abstract

A new mutual coupling compensation method based on a new mutual impedance matrix, as well as its application to dipole arrays, are proposed. This new mutual impedance matrix is deduced by electromotive force (EMF) method, based on the current distribution obtained by the characteristic basis function method. It appears in a concise and explicit formulation that facilitates the numerical calculation. The compensation performance is demonstrated and evaluated through its application in direction of arrival (DOA) estimation. Numerical results show that the proposed method exhibits excellent compensation performance compared with conventional mutual impedance matrix approaches.

Archives of Electrical Engineering

“…To calculate the output voltage of an antenna array in the presence of the mutual coupling effect, the corresponding mutual impedance matrix must be obtained and the array voltage segments could be calculated using Equation (3). Regarding the first and the second-order characteristics of basic function, the elements of the mutual impedance matrix of an array element can be obtained as follows [23]:…”

Tacking mutual coupling in antenna arrays for wireless communications

“…In fact, the need to handle mutual coupling problems differently in transmitting and receiving arrays has been noted before in [3] and [4]. More recently, some theoretical studies (for example [5], [6]) also indicated a more accurate characterization of mutual coupling in DOA estimation arrays by using a "receiving-mode" defined mutual impedances rather than the conventional mutual impedances. The basic difference between the receiving mutual impedance and the conventional mutual impedance lies in the fundamental causes of the coupling defining in these two mutual impedances.…”

“…Applying (5) to all antenna elements in the array ( 1, 2, , k N = ), the relationship between the uncoupled voltages k U and the received voltages (i.e., coupled voltages) k V can be written in a matrix equation as: Note that (6) is different from the equation derived by using the conventional mutual impedance method (CMIM) (see for example [11]) which results in the following typical equation relating the open-circuit voltages ok V to the received terminal voltages k V (this is same as the k V in our formulation (6) above).…”