A New Wideband Mutual Coupling Compensation Method for Adaptive Arrays Based on Element Pattern Reconstruction

Abstract

A new mutual coupling compensation method for wideband adaptive arrays is proposed. The new method is developed by combining the element pattern reconstruction method and the system identification method. The element pattern reconstruction method is valid and effective in the mutual coupling compensation for adaptive arrays such as dipole arrays and microstrip arrays. Each entry of the wideband compensation matrix is represented as an analytical expression against frequency. The polynomial coefficients and orders of all entries are obtained via the system identification method. The new wideband compensation method is characterized by the good adaptability of element structures and polarizations owing to the advantages of element pattern reconstruction method. A wideband microstrip array is designed to test the validity and effectiveness of the wideband compensation method.

A New Wideband Mutual Coupling Compensation Method for Adaptive Arrays Based on Cubic Hermite Interpolation

“…The frequency bandwidth of the isolated element covers about 2.25 octaves with VSWR ≤ 2.2. Besides, the center frequency is 368.5 MHz, and the relative bandwidth reaches 78%, which is much more than the relative bandwidth in previous methods [14,15]. The VSWR of the array state is terrible compared with that of the isolated state, which shows that the performance of the array is deteriorated by the mutual coupling of the antenna elements.…”

“…It is shown that various feature points are chosen corresponding to different curves. The curve fitting represents the complex-curve fitting method which was employed in [14,15]. Three interpolation methods are compared, of which the Cubic is the method employed in this paper; the Linear is the linear interpolation; the Spline is the cubic spline interpolation.…”

“…The system identification method was verified as an available one to obtain the wideband mutual coupling compensation matrix [12,13]. And this method has been combined with RMIM and EPR methods to get the analytical expression for each entry of the wideband compensation matrix against frequency, respectively [14,15]. However, when there is more than one extreme point in the entry curves of the wideband compensation matrix against frequency, the system identification method is almost invalid.…”

Wideband Direction of Arrival Estimation in the Presence of Unknown Mutual Coupling

“…The technique combines interferometry and a modified multiple signal classification (MUSIC) method to mitigate mutual coupling effects. In [20,21], narrowband MCMs at some discrete frequencies are calculated firstly based on the receiving mutual impedance method or the element pattern reconstruction method, then, utilizing the system identification methods, a wideband calibration matrix is obtained, which can be used to compensate the mutual coupling effects at all frequencies. An analysis of wideband DOA estimation taking account of mutual coupling effects is presented in [22,23,24].…”

Mutual coupling calibration for wideband adaptive arrays via Fourier-Bessel series

“…Therefore, Wang's method is also more suitable for the arrays composed of wire elements. An improved wideband mutual coupling calibration method was introduced to cover more element structures [10]. The 978-1-4673-65 44-4/15/$31.00 ©2015 IEEE element pattern reconstruction and complex curve-fitting are combined in this method [7,II].…”