Effects of mutual coupling on interference mitigation with a focal plane array

Warnick, Karl F.; Jensen, M.A.

doi:10.1109/tap.2005.852278

Cited by 38 publications

(32 citation statements)

References 26 publications

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“…The receiver noise R rec can be modeled using the network approach of [12], [13]. Array mutual coupling leads to correlation of front end amplifier noise and R rec is in general non-diagonal.…”

Section: B Noise Modelmentioning

confidence: 99%

Signal Processing for Phased Array Feeds in Radio Astronomical Telescopes

Jeffs

Warnick

Landon

et al. 2008

IEEE J. Sel. Top. Signal Process.

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Abstract-Relative to traditional waveguide feeds, phased array feeds (PAFs) for radio telescopes can increase the instrument field of view and sky survey speed. Unique challenges associated with PAF observations, including extremely low signal levels, long-term system gain stability requirements, spatially correlated noise due to mutual coupling, and tight beamshape tolerances, require the development of new array signal processing techniques for this application. We propose a calibration and beamforming strategy for PAFs including interference mitigation with power spectral density (PSD) estimation bias correction. Key efficiency metrics for single-feed instruments are extended to the array case and used to verify performance of the algorithms. These techniques are validated using numerical simulations and experimental data from a 19 element PAF on the Green Bank 20-Meter Telescope.

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Section: B Noise Modelmentioning

confidence: 99%

Signal Processing for Phased Array Feeds in Radio Astronomical Telescopes

Jeffs

Warnick

Landon

et al. 2008

IEEE J. Sel. Top. Signal Process.

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“…Consider a discrete set of incident fields, with the th field generating the open-circuit voltage and current . Finding the load impedance that on average matches the active impedances associated with all excitations means finding the solution minimizing the objective function (5) where is the active impedance for the th excitation. Setting the derivative of (5) with respect to equal to zero and solving (with the help of (2) and (3)) leads to (6) (7) where and denotes the th element of the matrix inside the brackets.…”

Section: B Stochastic Field Matchingmentioning

confidence: 99%

Uncoupled Matching for Active and Passive Impedances of Coupled Arrays in MIMO Systems

Jensen

Lau

2010

IEEE Trans. Antennas Propagat.

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Abstract-Impedance matching for coupled antenna arrays has received considerable attention in the research community. Because optimal matching requires implementation of a coupled network, leading to high complexity and often narrow operation bandwidth, new research has focused on the development of uncoupled matching networks with good performance. This paper explores traditional uncoupled impedance matching techniques for coupled arrays, specifically matching to the array active and passive impedances, within the context of multiple-input multiple-output communication. The concept of matching to the array active impedance is extended to the case where the propagating field is specified stochastically, and the performance of this solution is compared to that of traditional solutions using simulations. While emphasis is placed on matching for maximum power transfer, the paper concludes with a discussion on matching for minimum amplifier noise figure.

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“…In such applications, spatial arrays of radio frequency (RF) antennas are used to form the focal plane arrays (FPAs) of paraboloidal dishes, in rectangular aperture arrays (AAs) and in long baseline arrays (LBAs) [2]. In many applications, the signals of interest (SOIs) are narrowband although broadband SOIs are increasingly relevant.…”

Section: Introductionmentioning

confidence: 99%

On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters

Liyanage

Bruton

Agathoklis

2009

2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

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A 3D space-time filtering method is proposed for attenuating undesirable electromagnetic signals that propagate at or close to light speed across the surface of the plane that contains an array of antennas. Such signals may include the so-called radio frequency interference (RFI) that emanate from sources that lie well outside the directions of arrival (DOAs) of the signals of interest (SOIs). They may also include the intra-plane inter-antenna signals that result from the undesirable electromagnetic mutual coupling that exists between rectangularly-spaced antennas in aperture arrays (AAs) and in the focal plane arrays (FPAs) of paraboloidal dishes. Such signals have 3D space-time spectra possessing regions of support (ROSs) that are close to the surface of the 3D spectral light cone. They can therefore be attenuated by means of 3D space-time filters having 3D stopbands that include and encompass the surface of this light cone. Such a 3D space-time filter is described here and used to evaluate the validity of the proposed approach. Numerical results confirm that the proposed method significantly attenuates broadband RFI signals and moderately suppresses mutual coupling.

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Effects of mutual coupling on interference mitigation with a focal plane array

Cited by 38 publications

References 26 publications

Signal Processing for Phased Array Feeds in Radio Astronomical Telescopes

Signal Processing for Phased Array Feeds in Radio Astronomical Telescopes

Uncoupled Matching for Active and Passive Impedances of Coupled Arrays in MIMO Systems

On the attenuation of interference and mutual coupling in antenna arrays using 3D space-time filters

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