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A complementary split-ring array for compact decoupling 2 x 2 circularly polarized antenna

机译：紧凑型解耦2×2圆极化天线的互补分体环阵列

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摘要

In this letter, a complementary split-ring array (CSRA) for decoupling compact (edge-to-edge spacing of 0.078 lambda(0)) 2 x 2 circularly polarized (CP) microstrip antenna is proposed. The CSRA is the ground plane with the etched split-ring array (SRA) which is composed of 12 split-rings. Each element is surrounded by four etched split-rings, and the two adjacent elements share the same etched split-ring between them. The decoupling mechanism of the CSRA is to alter the amplitude and phase of the original coupling field and make the polarization of the adjusted coupling field mismatch with the receiving field. To verify the idea, the 2 x 2 CP antennas with and without CSRA are simulated and measured. The experimental results show that the maximum mutual coupling reduction is 29.6 dB for S-12, 23.6 dB for S-14, and 5.6 dB for S-13. Meanwhile, the impedance bandwidth and radiation characteristics remain almost unchanged. The measured results agree well with the simulated results, which showed new light on application of the proposed CSRA for multiple-input-multiple-output systems.
机译：在这封信中，提出了一种用于解耦紧凑型（边到边间距为0.078λ（0））2×2圆极化（CP）微带天线的互补裂环阵列（CSRA）。CSRA是带有蚀刻裂环阵列（SRA）的地平面，该阵列由12个裂环组成。每个元件由四个蚀刻的开口环包围，两个相邻元件之间共享同一个蚀刻的开口环。CSRA的解耦机制是改变原始耦合场的振幅和相位，使调整后的耦合场的偏振与接收场不匹配。为了验证这一想法，对带有和不带有CSRA的2 x 2 CP天线进行了仿真和测量。实验结果表明，S-12、S-14和S-13的最大互耦降低分别为29.6dB、23.6dB和5.6dB。同时，阻抗带宽和辐射特性几乎保持不变。实测结果与仿真结果吻合较好，为CSRA在多输入多输出系统中的应用提供了新的思路。

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