Scattering Cancellation Using Dipolar Arrays
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In this talk, we present a strategy for cancelling the scattered far field of a dipole interrogating a perfect conducting plane. The interrogating dipole acts as a monostatic radar (an interrogator collocated with receiver) and for the scattering cancellation effect we are using a distribution of infinitesimal dipoles located above the target. We assume that the interrogating dipole is located at (0,0,????). The goal is to determine the current feed required for the defending dipoles to cancel the scattered far field on a patch around the interrogating dipole while having a near zero effect on the field elsewhere. We mention that the additional effect of very small fields outside a small patch around the interrogating dipole could lead to other important applications such as field focusing, for example. We shall present some numerical simulations of this strategy applied to the scattering cancellation of the interrogator’s magnetic far field, starting with the specific case of a vertical interrogating dipole, in which the cancellation was done using vertical dipoles of appropriate currents. We then consider the general case of an arbitrarily-oriented interrogating dipole. In this set-up, cancellation was achieved using dipoles oriented in the ????,j and ???? directions with appropriate currents.