Effect of mutual coupling on the performance of adaptive arrays

Gupta, I.J.; Ksienski, A.

doi:10.1109/tap.1983.1143128

Cited by 647 publications

(437 citation statements)

References 7 publications

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“…Theoretical formulas for expressing the output SINRs of the LCMV and ESB beamformers are derived, respectively. Compared to the result presented in [25], our SINR formulas provide insights into the influence of the MC effects on the performances of the LCMV beamformer and the ESB beamformer. From our theoretical results, we note that the ESB beamformer outperforms the LCMV beamformer because the LCMV beamformer has a lower output signalto-noise power ratio (SNR) than the ESB beamformer.…”

Section: Introductionmentioning

confidence: 95%

“…Using the optimal weight vector given by (25), we obtain the interference power p io at the array output…”

Section: The Output Interference Powermentioning

confidence: 99%

“…To avoid the finite sample effects, 30000 data snapshots are taken to compute the sample correlation matriceŝ R xc ,R dd ,R ii , andR nn for the received data vector, desired signal, interferer, and noise, respectively. The optimal weight vectorsŵ LCMVc andŵ ESBc corresponding to the LCMV and ESB beamformers are obtained from (25) and (32) based onR xc , respectively. Then, the simulated SINR LCM V and SINR ESB are calculated as follows:…”

Section: Computer Simulation Examplesmentioning

confidence: 99%

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Performance Analysis of Antenna Array Beamformers With Mutual Coupling Effects

Lee

Chen²

2011

PIER B

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Abstract-Antenna array beamformers suffer from performance deterioration in the presence of mutual coupling (MC) between array sensors. In this paper, we present a theoretical analysis in terms of the output signal-to-interference-plus-noise ratio (SINR) for the performance of antenna array beamformers under MC effects. Based on the model of a distortion matrix to encapsulate the MC effects, a closed-form expression for the SINR is derived that is shown to accurately predict the SINR obtained in simulations. This theoretical formula is valid for any distortion matrix estimated from collected measurement data. The SINR formulas provide insights into the influence of the MC effects on the performances of the linearly constrained minimum variance (LCMV) beamformer and the eigenspace-based (ESB) beamformer. It is shown that the ESB beamformer outperforms the LCMV beamformer under MC effects. Moreover, we derive the formulas for computing the eigenvalues of signal correlation matrix under MC effects. Simulation results are presented for confirming the validity of the theoretical results.

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Section: Introductionmentioning

confidence: 95%

“…Using the optimal weight vector given by (25), we obtain the interference power p io at the array output…”

Section: The Output Interference Powermentioning

confidence: 99%

Section: Computer Simulation Examplesmentioning

confidence: 99%

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Performance Analysis of Antenna Array Beamformers With Mutual Coupling Effects

Lee

Chen²

2011

PIER B

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“…(5) based on Figure 3(c) [17]. These impedance matrices of the excited self-and mutual impedances are dependent on 1) the type, and 2) configuration of the array.…”

Section: The Coupling Excitationmentioning

confidence: 99%

Analysis of the Proximity Coupling of a Planar Array Quasi-Lumped Element Resonator Antenna Based on Four Excitation Sources

Olokede¹,

Adamariko²

2015

PIER B

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Abstract-In this paper, a simple-fed, low profile, 9 × 10 elements quasi-lumped planar antenna array is presented. The proposed resonator employs a quasi-lumped element resonator that uses interdigital capacitor (IDC) in parallel with a straight strip inductor shorted across the capacitor. The array elements were designed and then excited by a feed network of four coaxial probes situated at the bottom plane but separated from the ground plane using a plastic material. The entire array is divided into four sub-array lattices of 5 × 5 elements and excited by a coaxial probe located at the centre of the sub-arrays antenna structure, thus exciting the centre resonator who in turn excites the neighbouring elements via proximity coupling. The probes are connected based on Wilkinson power divider principle to provide in-phase excitation. An explicit method is introduced to quickly obtain the array factor (AF) characteristics for such proximity coupled rectangular planar array. Radiation pattern and the array factor are presented, and are further compared with those obtained by the simulation and experimental results. The proposed antenna comprises 9 × 10 elements array, each of which is 5.8 × 5.6 sq. mm in size, and the entire antenna structure is about 120 × 80 sq. mm.

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“…The widely known open-circuit voltage method [2] calculates the coupling matrix from the mutual impedances between the array elements. The self and mutual impedances can be obtained using the induced EMF method introduced by Carter in 1932 [3].…”

Section: Introductionmentioning

confidence: 99%

The Multiple Antenna Induced Emf Method for the Precise Calculation of the Coupling Matrix in a Receiving Antenna Array

Henault¹,

Antar²,

Rajan³

et al. 2009

PIER M

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Abstract-Practical antenna array designs generally require that the elements are separated by electrically short distances. The resultant mutual coupling often adversely affects the achievable performance. Various methods are available to quantify the effects of mutual coupling in arrays and improve performance through mutual coupling compensation. Mutual coupling is often described by a coupling matrix that relates the coupled and uncoupled quantities. Unfortunately, the accuracy with which the coupling matrix can be calculated is highly dependent on both the method selected and the frequency. This is a significant limitation for wideband analysis where the coupling matrix needs to be calculated accurately at all frequencies of interest. This paper introduces a novel method for the precise calculation of the coupling matrix at any frequency of interest. It is an extension of the induced EMF method to multiple array elements. The method has the important practical advantage of being independent of the numerical technique used in the analysis. Since the coupling matrix is calculated by exciting the elements in the transmission mode, the method resembles well-known network analysis. However, as outlined in the paper, there are subtle differences between the two approaches, which lead to more accurate results with the new proposed method. It is also demonstrated that antennas with arbitrary geometries and illuminations are handled accurately by the method.Corresponding author: S. Henault (henault@rmc.ca). 104Henault et al.

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Effect of mutual coupling on the performance of adaptive arrays

Cited by 647 publications

References 7 publications

Performance Analysis of Antenna Array Beamformers With Mutual Coupling Effects

Performance Analysis of Antenna Array Beamformers With Mutual Coupling Effects

Analysis of the Proximity Coupling of a Planar Array Quasi-Lumped Element Resonator Antenna Based on Four Excitation Sources

The Multiple Antenna Induced Emf Method for the Precise Calculation of the Coupling Matrix in a Receiving Antenna Array

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