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  • 1.
    Alayon Glazunov, Andres
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    A survey of the application of the spherical vector wave mode expansion approach to antenna-channel interaction modeling2014In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 49, no 8, p. 663-679Article in journal (Refereed)
    Abstract [en]

    This paper provides an overview of recent advances in the modeling, analysis, and measurements of interactions between antennas and the propagation channel in multiple antenna systems based on the spherical vector wave mode expansion of the electromagnetic field and the antenna scattering matrix. It demonstrates the importance and usefulness of this approach to gain further insights into a variety of topics such as physics-based propagation channel modeling, mean effective gain, channel correlation, propagation channel measurements, antenna measurements and testing, the number of degrees of freedom of the radio propagation channel, channel throughput, and diversity systems. The paper puts particular emphasis on the unified approach to antenna-channel analysis at the same time as the antenna and the channel influence are separated. Finally, the paper provides the first bibliography on the application of the spherical vector wave mode expansion of the electromagnetic field to antenna-channel interactions.

  • 2.
    Ellgardt, Anders
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Norgren, Martin
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    A study of edge effects in triangular grid tapered-slot arrays using coupling coefficients2010In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 45, p. RS2005-Article in journal (Refereed)
    Abstract [en]

    Edge effects for tapered-slot elements in triangular grid array antennas are studied by using finite difference time domain codes. The S parameters for finite-by-infinite arrays are computed and evaluated for two different edge models and, to evaluate the edge effects, the results are compared with the S parameters for the infinite array. As expected, the largest difference between the results occurs for the elements closest to the edges, because of the missing coupling from nearby elements and the perturbed element currents due to the edge geometry. By using the proposed method it is possible to distinguish between these two edge effects. A method to combine the finite-by-infinite array results and the infinite array results is presented and used to characterize the perturbation caused by the truncation of the infinite array.

  • 3.
    Frid, Henrik
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering.
    Malmström, Johan
    Saab Surveillance, Stockholm, Sweden.
    Jonsson, B. Lars G.
    Determining Direction‐of‐Arrival Accuracy for Installed Antennas by Postprocessing of Far‐Field Data2019In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 54, no 12, p. 1204-1221Article in journal (Refereed)
    Abstract [en]

    Direction‐of‐arrival (DoA) estimation accuracy can be degraded due to installation effects, such as platform reflections, diffraction from metal edges, and reflections and refraction in the radome. To analyze these effects, this paper starts with a definition of the term installation error related to DoA estimation. Thereafter, we present a postprocessing method, which can be used to determine the DoA estimation accuracy for installed antennas. By computing synthetic signals from the installed far‐field data, it is possible to analyze the installation errors described above, in addition to analyzing array model errors. The method formulation is general, thus allowing generic array configurations, installation configurations, and direction‐finding algorithms to be studied. The use of the presented method is demonstrated by a case study of a wideband four‐quadrant array. In this case study, we investigate the installation errors due to a single‐shell radome. Thereafter, the effects of platform reflections are also analyzed, for an antenna placement in the tail of a fighter aircraft. Simulation results are presented for both the monopulse and the MUltiple SIgnal Classification direction‐finding algorithms.

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  • 4. Gustafsson, M.
    et al.
    He, Sailing
    KTH, Superseded Departments, Electromagnetic Theory.
    An optimization approach to two-dimensional time domain electromagnetic inverse problems2000In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 35, no 2, p. 525-536Article in journal (Refereed)
  • 5.
    He, Sailing
    et al.
    KTH, Superseded Departments, Electromagnetic Theory.
    Popov, M.
    Romanov, V.
    Explicit full identification of a transient dipole source in the atmosphere from measurement of the electromagnetic fields at several points at ground level2000In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 35, no 1, p. 107-117Article in journal (Refereed)
  • 6.
    Persson, Patrik
    et al.
    KTH, Superseded Departments, Electromagnetic Theory.
    Rojas, Roberto G.
    High-frequency approximation for mutual coupling calculations between apertures on a perfect electric conductor circular cylinder covered with a dielectric layer: Nonparaxial region2003In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 38, no 4, p. 1079-Article in journal (Refereed)
    Abstract [en]

    An asymptotic Green's function technique is presented for the calculation of the surface fields on a perfect electric conductor circular cylinder covered with a dielectric layer. The sources are apertures located on the perfect electric conductor surface. This method is very efficient and valid for large cylinders in terms of wavelengths. The new representation is obtained via Watson's transformation and integral contour deformations. The efficiency of the method results from the circumferentially propagating representation of the Green's function as well as the efficient numerical evaluation of various integrals. Numerical results are presented showing good agreement when compared to other solutions as well as measurements.

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