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提出了一种新型的单层双频双圆极化天线单元及其阵列。天线单元由工作在低频的外部环形贴片和工作在高频的内部矩形贴片套叠构成。通过在两贴片上长宽比与切角的调节实现了低频左旋圆极化(LHCP)和高频右旋圆极化(RHCP)特性。为验证该方法的正确性,设计了一个工作在11.9 GHz/17.5 GHz的双频双圆极化单元,并在此基础上设计了一个4×4的双频双圆极化天线阵列。
A new single-layer dual-frequency dual-circular polarization antenna unit and its array are proposed. The antenna unit consists of an outer ring patch that operates at low frequencies and an inner rectangular patch that operates at high frequencies. Low-frequency LHCP and RHCP characteristics were achieved by adjusting the aspect ratio and the cut angle on the two patches. In order to verify the correctness of the method, a dual-frequency dual-circular polarization unit operating at 11.9 GHz / 17.5 GHz was designed. Based on this, a 4 × 4 dual-frequency dual-circular polarization antenna array was designed.