Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.
Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Sensors (Basel). 2023 Jan 11;23(2):846. doi: 10.3390/s23020846.
This paper investigates the miniaturization capability of split ring array antennas embedded in a low-permittivity dielectric substrate, in comparison with the same-sized high-permittivity dielectric resonator antennas (DRAs). In order to understand the miniaturization performance, a size-fixed dielectric substrate with different split ring arrays is studied. The simulation results show that the miniaturization capability increases with decreased unit cell resonant frequency and/or increased unit cell induced permeability. Miniaturizations as high as 25.54 times that of a high-permittivity DRA are obtained with split rings, etched on a dielectric substrate having a low permittivity of 2.2. Furthermore, this excessive miniaturization does not come at the expense of excessive deterioration of the antenna impedance bandwidth, gain, and radiation efficiency. Consequently, the miniaturized split ring arrays still provide high gains over wider bandwidths. This inference is further verified by comparing the miniaturization and other antenna performance parameters with three other modified split ring configurations. To experimentally verify this work, a split ring antenna was fabricated and tested, and good agreement between the simulated and measured results was observed. The results of this study indicate that adding resonant metallic inclusions into low- permittivity DRAs significantly increases their miniaturization capability, without overly deteriorating the performance.
本文研究了嵌入低介电常数介质基板中的分裂环阵列天线的小型化能力，与相同尺寸的高介电常数介质谐振器天线（DRA）进行了比较。为了理解小型化性能，研究了具有不同分裂环阵列的尺寸固定的介质基板。仿真结果表明，随着单元谐振频率的降低和/或单元感应磁导率的增加，小型化能力增加。通过在介电常数为 2.2 的低介电常数基板上刻蚀分裂环，可以获得高达高介电常数 DRA 的 25.54 倍的小型化。此外，这种过度小型化不会以牺牲天线阻抗带宽、增益和辐射效率的过度恶化为代价。因此，小型化的分裂环阵列仍然在更宽的带宽内提供高增益。通过与另外三种修改后的分裂环配置比较，这种小型化和其他天线性能参数的推断得到了进一步验证。为了实验验证这项工作，制造并测试了一个分裂环天线，观察到模拟和测量结果之间的良好一致性。这项研究的结果表明，在低介电常数 DRA 中添加谐振金属夹杂物可显著提高其小型化能力，而不会过度恶化性能。
