Split ring metamaterial unit-based dual-frequency circularly polarized plane reflective array antenna

Abstract

The invention discloses a split ring metamaterial unit-based dual-frequency circularly polarized plane reflective array antenna. The antenna is provided with a dual-frequency composite plane reflective array and a circularly polarized horn feeding source arranged below the dual-frequency composite plane reflective array, wherein the reflective array comprises grounding metal, an interlayer dielectric substrate, and a metal split ring array plane which is formed by low-frequency and high-frequency split ring units in alternate arrangement and has a center winding two-dimensional array structure; the array plane adopts a multi-partition sub-array parallel structure; and the feeding source comprises a rectangular waveguide, a rectangular waveguide transitional section, a circular waveguide with angle of chamfer, a circular waveguide transitional section, and a circular opening waveguide, wherein the opening of the circular opening waveguide is changed from narrow to wide. The working bandwidth of the reflective array can be improved based on the multi-resonant characteristic of the split ring metamaterial units; by virtue of the multi-partition sub-array parallel design method, the modeling speed and efficiency of the array plane can be effectively improved; and partition processing and shaping of the large-scale plane array can be facilitated.

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