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  • 1.
    Colombi, Davide
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Thors, Björn
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Jonsson, B. Lars G.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Experimental whole-body SAR assessments by means of surface scan with no phase information2011In: 33rd Annual Meeting of the Bioelectromagnetics Society, 2011Conference paper (Refereed)
  • 2.
    Persson, Patrik
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Thors, Björn
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    RCS reduction of antennas integrated in an infinite PEC plane2005In: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 2005, p. 74-77Conference paper (Refereed)
  • 3.
    Thors, Björn
    et al.
    KTH, Superseded Departments, Alfvén Laboratory.
    Josefsson, L.
    Rojas, R. G.
    The RCS of a clylindrical array antenna coated with a dielectric layer2004In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 52, no 7, p. 1851-1858Article in journal (Refereed)
    Abstract [en]

    The scattering properties of dielectric coated waveguide aperture antennas mounted on circular cylinders are investigated. Both the single element antenna and the array case are treated. The array antenna consists of 4 x 32 rectangular apertures placed in a rectangular grid on the surface of an infinitely long circular cylinder. The problem is formulated in terms of an integral equation for the aperture fields which is solved with the method of moments using rectangular waveguide modes as basis and test functions. An efficient uniform asymptotic technique is used to calculate the excitation vector and the backscattered far-field. The asymptotic solution is valid for large cylinders coated with thin dielectric layers away from the paraxial (i.e. near axial) region. A similar asymptotic solution is used to calculate the mutual coupling in the nonparaxial region. For the self coupling terms and for the mutual coupling in the paraxial region a planar approximation is used with a corresponding spectral domain technique. Numerical results are presented as a function of frequency, angle of incidence, cylinder radius, and electrical thickness of the coating.

  • 4.
    Thors, Björn
    et al.
    KTH, School of Electrical Engineering (EES).
    Steyskal, Hans
    KTH, School of Electrical Engineering (EES).
    Holter, H.
    Broad-band fragmented aperture phased array element design using genetic algorithms2005In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 53, no 10, p. 3280-3287Article in journal (Refereed)
    Abstract [en]

    In this paper, a synthesis procedure to design thin broad-band fragmented aperture array elements is described. The arrays are assumed to be infinite periodic and the elements consist of a conducting pattern etched on a dielectric backed by a groundplane. A genetic algorithm (GA) is used to design the conducting pattern, relative permittivity, and thickness of the dielectric substrate with respect to array scan and bandwidth performance. The fitness function in the GA is evaluated using a finite-difference time-domain code with periodic boundary conditions. For a substrate thicker than about 0.1 lambda(L) (lambda(L)=wavelength at the lowest frequency in the frequency band investigated), it was found that a bandwidth of at least one octave can be obtained for arrays scanned within 45 degrees from broadside.

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