Alternating Generation of Single and Multi-Beam Modes Using the Sequential Rotation Technique in Antenna Arrays

A simple technique for generating single and multiple beams from antenna arrays is presented. The approach is based on the sequential rotation technique. It is shown that by applying a controlled second sequential rotation, circularly polarized antenna arrays operating alternately in a single-beam mode M1 and multi-beam mode M2 in the same frequency band can be designed. Proof of the concept is provided in light of case studies. The approach can be applied to large antenna arrays following a modular principle adapted to the array size and needed applications without loss of generality.