Minimizing field scattered by slender dipoles

The problem of minimizing the field scattered by a single dipole or dipole array is characteristic of dual-frequency antenna arrays colocated in a single aperture, where one of the arrays is a dipole array and is positioned above the other. It is also characteristic of efforts to reduce the effective scattering surface area of dipole antennas. The problem of reducing dipole antenna scattering is solved by means of active suppression. This is accomplished by feeding to those dipoles on which the external electromagnetic impinges, an energy at the same frequency as the incident field via additional feed circuits. A reduction in the overall current induced in the dipoles can be achieved in the additional feed circuits by the appropriate choice of the amplitude and phase of the excitation. The formulation of the problem of such excitation is simplified by using simulation in the form of several e.m.f. sources connected to the dipole sections through matched circulators and feed lines with a specific characteristic impedance. An algorithm is derived for the choice of the optimal values of the e.m.f.'s and the results of a confirming numerical analysis are shown graphically.