In this paper, a multiband THz Multi-Input Multi-Output (MIMO) antenna is designed with dimensions of 80×100×10.8μm³. The antenna is made-up on a gold-plated Arlon AD410 substrate with a relative permittivity of 4.1.It operates at three resonant frequencies, namely 1.45THz, 2.25THz, and 3.25THz, achieved through the integration of Complementary Split-Ring Resonator (CSRR) and Substrate Integrated Waveguide (SIW) technologies. The two-element MIMO configuration of the antenna ensures exceptional performance, offering high throughput with data rates of 25.23Gbps for the Quadrature Phase Shift Keying (QPSK) scheme and 56.68Gbps for the 16-Quadrature Amplitude Modulation (QAM) scheme. It also exhibits remarkable channel capacity, approximately 8.2bps/Hz at Signal-to-Noise Ratio (SNR) = 20dB, surpassing the capabilities of single-element antennas. Moreover, it demonstrates excellent diversity performance for judging the MIMO antenna performance. This is evident through the following key metrics: Envelope Correlation Coefficient (ECC) < 0.02, indicating that less than 1 % of power is transferred from the excited antenna to the second 50Ω terminated antenna when antenna-1 is excited; Directive Gain (DG) >9.95dB; Total Active Reflection Coefficient (TARC) < -10dB, ensuring that a minimum of 90 % of the power is delivered to the patch port; and Channel Capacity Loss (CCL) < 0.35 bits/sec/Hz, guaranteeing reliable wireless communication. The antenna boasts peak gains of 3.83dBi, 4.06dBi, and 6.82dBi at 1.45THz, 2.25THz, and 3.25THz, respectively, along with a radiation efficiency of approximately 37, 58, and 51 % at the corresponding frequencies. Notably, the first two bands (1.34-1.51THz and 2.20-2.28THz) exhibit narrow bandwidths with quality factors above 80, making them particularly suitable for sensing applications in biomedical. Band-1 offers an average sensitivity of 3222.22 GHz/RIU and an FOM of 17.89, while Band-2 provides an average sensitivity of 2578.68 GHz/RIU and an FOM of 14.38. These characteristics make it well-suited for near-field Nano-communications and sensing applications.

本文设计了一种尺寸为80×100×10.8μm3的多频段太赫兹多输入多输出（MIMO）天线。该天线采用镀金 Arlon AD410 基板制成，相对介电常数为 4.1。它工作在三个谐振频率，即 1.45THz、2.25THz 和 3.25THz，通过集成互补开环谐振器（ CSRR）和基板集成波导（SIW）技术。该天线的两元件 MIMO 配置可确保卓越的性能，为正交相移键控 (QPSK) 方案提供高吞吐量，数据速率为 25.23Gbps，为16 正交幅度调制 (QAM) 方案提供 56.68Gbps 的数据速率。它还具有卓越的信道容量，在信噪比 (SNR) = 20dB 时约为 8.2bps/Hz，超越了单元件天线的能力。此外，它还表现出出色的分集性能，可用于判断 MIMO天线性能。通过以下关键指标可以明显看出这一点： 包络相关系数 (ECC) < 0.02，表明当天线 1 被激励时，不到 1% 的功率从受激励天线传输到第二个 50Ω 端接天线；定向增益（DG）>9.95dB；总有源反射系数（TARC）< -10dB，确保至少90%的功率传递到接线端口；信道容量损失 (CCL) < 0.35 位/秒/赫兹，保证可靠的无线通信。该天线在1.45THz、2.25THz和3.25THz处的峰值增益分别为3.83dBi、4.06dBi和6.82dBi，相应频率下的辐射效率分别约为37%、58%和51%。值得注意的是，前两个频段（1.34-1.51THz 和 2.20-2.28THz）具有窄带宽，品质因数高于 80，使其特别适合生物医学中的传感应用。Band-1 的平均灵敏度为 3222.22 GHz/RIU，FOM 为 17.89，而 Band-2 的平均灵敏度为 2578.68 GHz/RIU，FOM 为 14.38。这些特性使其非常适合近场纳米通信和传感应用。