This letter presents a scannable directional modulation secure communication method based on a single-sideband time-modulated array. By optimizing the modulation parameters that generate equivalent amplitude-phase weighting for each antenna element in the radio frequency channel, the main beam of the first-order harmonic and nulls of higher order harmonics are simultaneously steered toward the desired direction. This enables efficient transmission of signals with bandwidths exceeding the modulation frequency. Furthermore, in contrast to conventional approaches, the proposed method incorporates the degree of harmonic energy aliasing across all orders at nontarget directions into the optimization objective, thereby enhancing signal distortion and ensuring robust information security at these directions. Numerical simulations validate the feasibility of the proposed method. Experimental results demonstrate that the communication bit error rate decreases to as low as 1 x 10(-4 ) at the target communication direction, whereas it exceeds 30% at all nontarget directions within -40 degrees to 40 degrees.
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