Variable permittivity dielectric material loaded stepped-horn antenna
Variable permittivity dielectric material loaded stepped-horn antenna
Variable permittivity dielectric material loaded stepped-horn antenna
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27input of the <strong>horn</strong> B° are obtained for any incident field A° using following formulasEquation (2.72) uniquely determines the aperture field. Since we know the aperture fields,exact solution of magnetic current distributions on the aperture can be found using either(2.62) or (2.64). Antenna characteristics then can be calculated using the equivalent magneticcurrent density.2.4 Half-Space AdmittanceThe expressions for the magnetic field are constructed by means of the electric vectorpotential and magnetic scalar potential which ensures that Maxwell's equations and theradiation condition are satistified. Also, image theory is invoked, thereby causing the fieldexpressions to satisfy the boundary conditions on the screen. Half-space magnetic field canbe obtained from