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Photograph (taken from the top) of the cluster made of alumina rods that has been inversely designed to get a highly directional EM beam from a monopole antenna placed at the central cavity, whose position is highlighted by the red circle.
Performance of the directional source based on a PhC at a frequency of : (upper panel) map of the field amplitude emitted by a point source located at the slab center; (lower panel) angular dependence at from the center of the device. Simulations based on multiple scattering.
Performance of the directional source based on ID: (upper panel) map of the field intensity emitted by a point source embedded in the ID structure shown in Fig. 1; (lower panel) angular dependence at from the center of the device. Simulations based on multiple scattering.
Maps of normalized measured power as a function of frequency and angle for a monopole inside the (a) PhC and (b) ID structure.
Transverse normalized intensity profiles for the ID structure (see Fig. 1) at the frequency where the maximum is obtained. The far-field detected power in the forward (blue line), lateral (black line), and backward (red line) directions is shown.
Radiation properties of proposed directional sources: one based on a PhC and the other obtained by ID. gives the number of cylinders employed in its design, is the total radiation enhancement factor, HPAW define the half power angular width, and is the relevant radiation efficiency in the principal direction of emission (the positive axis).
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