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A new concept for design of scanning antennas is suggested. The concept is based upon a combination of a single radiating element movement with antenna aperture synthesizing. The radiator movement may be either real or virtual one. In turn, the latter may be either mechanical or electronic one. In the paper, the case of electromechanical motion is preferably considered. Various realizations of real and virtual movements of the radiator are shortly described. Examples of the concept implementing are presented. Advantages and drawbacks of the concept are briefly discussed.

No abstract

A new principle to generate chaotic signals using the phenomenon of charge avalanche multiplication and internal feedback in multilayered semiconductor structures is suggested. Linear and nonlinear theories for the self-oscillations are developed and existence of the chaotic regime with fast decay of correlations is proven.