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Dielectric bead loading for control of currents on electrically long dipole antennas

Dielectric bead loading for control of currents on electrically long dipole antennas,10.1109/APS.2004.1330332,Timothy F. Kennedy,S. A. Long,J. T. Will

Dielectric bead loading for control of currents on electrically long dipole antennas   (Citations: 2)
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Methods for the modification and control of currents on electrically long wires have been studied in order to determine the feasibility of using existing structures as efficient radiators. Such radiators would be formed from conducting surfaces present on buildings or other structures, thus providing an additional resource in concealing antennas used for wireless communication. An element composed of dielectric beads has been successfully used to modify the current distributions on electrically long wires, such that the wires radiate similarly to a much smaller element. A simple model of a composite element made up of dielectric beads is presented, and a genetic algorithm is used to design the loading of a 4λ0 wire, such that the radiation pattern emulates that of a half-wave dipole. The simple model of the dielectric beads made it possible to run many simulations of the loaded wire using the GA. The ease with which dielectric bead loaded wires can be modeled suggests that the design of efficient radiators from existing, and more complicated, wire structures is possible.
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    • ...The modification and control of currents on electrically large wire structures has been treated previously [1]‐[11]...

    Timothy F. Kennedyet al. Modification and Control of Currents on Electrically Large Wire Struct...

    • ...Methods formodification andcontrol ofcurrents onelectrically long wires [1-5] havebeenstudied foruseasefficient radiators forwireless applications, andwere aimed atdetermining thefeasibility ofcreating antennas fromexisting conducting structures intheenvironment [1-4]...
    • ...Methods formodification andcontrol ofcurrents onelectrically long wires [1-5] havebeenstudied foruseasefficient radiators forwireless applications, andwere aimed atdetermining thefeasibility ofcreating antennas fromexisting conducting structures intheenvironment [1-4]...
    • ...Thedielectric loading was proposed in[1], andwasoriginally applied towires...
    • ...Consider thesection ofwindow frame showninFigure 1.Thewindow frame length isL=4X0, andnodielectric loading hasbeenapplied...
    • ...Theco-polarized fields, E0,forseveral values ofqp areshowninFigure 1.Notethat without modification tothecurrent distribution excited onthis structure, itcannot beused forwireless applications where ahalf-wave dipole pattern isdesired...
    • ...Figure 1.Unloaded 4kosection ofawindowframeandits co-polarized radiation pattern...
    • ...Goodresults wereobtained foradielectric withE,=36, width, w=-1.9cm, andheight, h=2.6cm...
    • ...Sixdielectric loads areapplied tothe4X0window frame showninFigure 1.The resulting loaded structure isshown inFigure 3.Theloading issymmetric with three loads placed above andbelow thecenter ofthewindow frame...

    Timothy F. Kennedyet al. Modification and control of the radiation properties of electrically l...

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