Antenna diagnostics on planar arrays using a 3D source reconstruction technique and spherical near-field measurements

Jørgensen, Erik; Hess, Doren W.; Meincke, Peter; Borries, Oscar; Cappellin, Cecilia; Fordham, Jeff

doi:10.1109/eucap.2012.6206503

Cited by 14 publications

(17 citation statements)

References 11 publications

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“…4) Definition of additional derived outputs, e.g., filtered noise-free patterns radiated by the reconstructed currents. The DIATOOL software has been validated through several practical cases reported in [6], [7]. An additional example involving a typical antenna diagnostics procedure is reported below.…”

Section: Processing Of Measured Fields Using Diatoolmentioning

confidence: 99%

New modelling capabilities in commercial software for high-gain antennas

Jørgensen

Lumholt

Meincke

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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Abstract-This paper presents an overview of selected new modelling algorithms and capabilities in commercial software tools developed by TICRA. A major new area is design and analysis of printed reflectarrays where a fully integrated design environment is under development, allowing fast and accurate characterization of the reflectarray element, an initial phaseonly synthesis, followed by a full optimization procedure taking into account the near-field from the feed and the finite extent of the array. Another interesting new modelling capability is made available through the DIATOOL software, which is a new type of EM software tool aimed at extending the ways engineers can use antenna measurements in the antenna design process. The tool allows reconstruction of currents and near fields on a 3D surface conformal to the antenna, by using the measured antenna field as input. The currents on the antenna surface can provide valuable information about the antenna performance or undesired contributions, e.g. currents on a cable, can be artificially removed. Finally, the CHAMP software will be extended to cover reflector shaping and more complex materials, which combined with a much faster execution speed will make CHAMP an ideal tool for design and optimization of compact rotationally symmetric reflector systems, e.g., maritime satellite terminals.

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Section: Processing Of Measured Fields Using Diatoolmentioning

confidence: 99%

New modelling capabilities in commercial software for high-gain antennas

Jørgensen

Lumholt

Meincke

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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“…A rather general three-dimensional formulation with electric and magnetic surface current densities was presented in [4]. Based on the observation that a formulation with electric and magnetic surface current densities (sometimes also called dual-source formulation) is redundant, dual-equation formulations were introduced and discussed in [5][6][7][8][9] that work with a zero-field or Love condition for the fields in order to eliminate the redundancy of the dual-source approach. Zero-field condition means here that the fields due to the sources on a closed Huygens surface around the antenna under test (AUT) are forced to be zero within the enclosed volume.…”

Section: Introductionmentioning

confidence: 99%

“…In [5,6], very detailed investigations on solution errors are presented, as well as singular value spectra, again on the basis of the NR system of normal equations. The NR type of equations are utilized in [7,8], too, together with a Tikhonov-based formulation, where the weighting coefficient for the Love-condition constraint equations is obtained by evaluating the L-curve.…”

Section: Introductionmentioning

confidence: 99%

On the Solution of Inverse Equivalent Surface-Source Problems

Kornprobst¹,

Mauermayer²,

Neitz³

et al. 2019

PIER

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Various formulations of the inverse equivalent surface-source problem and corresponding solution approaches are discussed and investigated. Starting from the radiation integrals of electric and magnetic surface current densities, the probe-corrected inverse equivalent source formulation is set up together with different forms of side constraints such as the zero-field or Love condition. The linear systems of equations resulting from the discretized forms of these equations are solved by the normal residual (NR) and normal error (NE) systems of equations. As expected and as demonstrated by the solution of a variety of inverse equivalent surface-source problems, related to synthetic as well as realistic antenna near-field measurement data, it is found that the iterative solution of the NE equations allows for a better control of the solution error and leads in general to a slightly faster convergence. Moreover, the results show that the incorporation of the zero-field condition into the solution process is in general not beneficial, which is also supported by the structure of the NE systems of equations. If desired, Love surface current densities, or just fields in general, can more easily be computed in a post-processing step. The accuracy of the obtained near-fields and far-fields depends more on the stopping criterion of the inverse source solver than on the particular choice of the equivalent surface-source representation, where the zero-field condition may influence the stopping criterion in a rather unpredictable way.

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“…These methods have been utilized for various diagnostic purposes [1,5,8,9,1114,16,17]. The reconstructions are established by employing a surface integral representation often in combination with a surface integral equation.…”

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confidence: 99%

“…Other research groups have employed slightly dierent combinations of surface integral representations and surface integral equations to diagnose objects. Especially, radiation contributions from leaky cables are analyzed in [16], antennas are diagnosed in [1,8,9,11,17], and equivalent currents on a base station antenna are studied in [5]. A more detailed background of source reconstruction methods is found in [14].…”

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confidence: 99%