ABSTRACT

A dual-band 2$$\times$$1 multiple-input-multiple-output (MIMO) antenna based on substrate integrated waveguide (SIW) cavity for both satellite (in K-band) and 5G applications is proposed. Initially, the SIW cavity consisting of metallic vias on all four sides is implemented. For MIMO configuration, this cavity is divided into two smaller SIW cavities using a row of metallic vias and excited using the coaxial feed. By etching an asymmetric cross-slot (AXS) with tuned dimensions on top of the SIW cavity, a dual-sense of circular polarization (CP) in both frequency bands is obtained. The fabricated prototype of the proposed SIW antenna shows impedance bandwidth (IBW) of 15.36% (22.60-26.36 GHz; Band-I), 4.64% (29.04-30.42 GHz; Band-II). The completely overlapping axial-ratio bandwidth (ARBW) with IBW of 15.16% (22.62-26.33 GHz), 3.10% (29.20-30.12 GHz) with a peak gain of 12.47, 7.71 dBi is obtained in Band-I and II, respectively. The proposed antenna shows front-to-back ratio (FBR) of more than 20 dB in both resonating frequency bands. The measured results of the proposed MIMO antenna agree well with the simulation.

摘要

双频2$$\times$$1 个基于基板集成波导 (SIW) 腔的多输入多输出 (MIMO) 天线，用于两个卫星（K中）-band）和5G应用被提出。最初，实现了由所有四个侧面上的金属通孔组成的 SIW 腔。对于 MIMO 配置，该空腔使用一排金属通孔分为两个较小的 SIW 空腔，并使用同轴馈电进行激励。通过在 SIW 腔顶部蚀刻具有调谐尺寸的非对称十字槽 (AXS)，可以获得两个频带中的圆极化 (CP) 双重感。所提出的 SIW 天线的制造原型显示阻抗带宽 (IBW) 为 15.36% (22.60-26.36 GHz; Band-I), 4.64% (29.04-30.42 GHz; Band-II)。在 Band-I 和 II 中分别获得了 IBW 为 15.16% (22.62-26.33 GHz)、3.10% (29.20-30.12 GHz)、峰值增益为 12.47、7.71 dBi 的完全重叠的轴向比带宽 (ARBW)。所提议的天线在两个谐振频带中显示出超过 20 dB 的前后比 (FBR)。所提出的 MIMO 天线的测量结果与仿真非常吻合。