Abstract
Abstract : An optimization of the reradiated field from a linear Van Atta reflector consisting of four equispaced parallel half-wave dipoles is made. Before the optimization process is discussed, a further and more extensive theoretical investigation than the one given in Scientific Report no. 2 (AD-613 607) is made. A general expression for the reradiated field is established so that it is possible to study the influence of asymmetries in the location of the dipoles, unequal length of the transmission lines, and a mismatch between the dipoles and the transmission lines. In particular, the dependence of the reradiation pattern on the length and the characteristic impedance of the transmission lines, the imaginary part of the dipole impedances, and the spacing between the dipoles, is investigated. The reradiation pattern is optimized so that the back-scattering, as a function of the angle of incidence, has its largest minimum value. The optimization is performed both when coupling is neglected and when it is taken into account. In the optimization consideration is given to the shape of the reradiation pattern near the direction back in the direction of propagation of an incident wave.
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