Adaptive nulling of a linear dipole array in the presence of mutual coupling

Abstract

This article proposes a novel mutual impedance matrix model for compensating mutual coupling effects in adaptive array with application to adaptive nulling of interference signals. In the new method, extreme care has been taken into account for both self impedance and mutual impedance, relating to the mutual coupling effects. Numerical simulation results demonstrate the robustness and capability of this technique. By using the new method, it is found that both the accuracy of the positioning and depth of the nulls are significantly improved. Performance comparisons of the new methodology and several other previous techniques via a number of simulation are presented. V C 2013 Wiley Periodicals, Inc.Int J RF and Microwave CAE 24:30-38, 2014.

Mutual coupling compensation for a practical VHF/UHF Yagi‐Uda antenna array

“…By using the currents and voltages on the Yagi-Uda antenna terminals, the Yagi-Uda antenna array as an (P + 1)-terminal linear time invariant (LTI) network can be described. Thus, (4) will be formulated as follows [20,21]…”

“…I P = V P /Z L indicates the induced current at the terminals of the Yagi-Uda antenna. As pointed out in [20,21], the effect of induced current on the pth Yagi-Uda antenna because of scattered fields from other Yagi-Uda antennas are formulated by adding Z p, p t term as self-impedance into the mutual coupling equations. Hence, the new MIM contains some self-impedance terms.…”

“…Mutual coupling among the array elements can significantly degrade the performance of high-resolution DOA estimation techniques mentioned above and associated signal processing algorithms [6][7][8][9][10][11]. Hereupon, this undesired effect has attracted the attention of many researchers who work in this context [6,[12][13][14][15][16][17][18][19][20][21]. The present study focuses on the methods which use mutual impedance matrices (MIMs) to compensate the mutual coupling effects.…”

“…This paper investigates the decoupling methodology for compensating mutual coupling effects in a practical VHF/ UHF Yagi-Uda antenna array by using a new MIM model. As pointed out in [20,21], the scheme of the above-mentioned references is not precise, and some mutual coupling terms have been ignored. In the new method, extreme care has been taken to account for both self-impedance and mutual impedances, relating to mutual coupling effects.…”

“…In the new method, extreme care has been taken to account for both self-impedance and mutual impedances, relating to mutual coupling effects. As shown in [20,21] these newly calculated MIM can, more efficiently, eliminate the mutual coupling effects in a ULA with application to DOA estimation and related topics, such as adaptive nulling. In this work, a new MIM for compensating mutual coupling effects in VHF/UHF Yagi-Uda antenna array and decoupling methodology is introduced.…”