Aragbaiye Yewande Mariam, Isleifson Dustin
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). 2024 Apr 22;24(8):2654. doi: 10.3390/s24082654.
In this article, we present new design techniques to improve the gain and impedance bandwidth of short backfire antennas. For the gain enhancement procedure, our approach was to flare the rim of the antenna, which simultaneously led to an increase in the impedance bandwidth of the antenna. Parametric studies were carried out to obtain the optimal flaring angle. The peak realized gain was obtained as 17.2 dBi with an impedance bandwidth of 55% (2.4 dB and 28.6% increase in gain and bandwidth, respectively, compared to the unflared antenna). To further enhance the impedance bandwidth, an inductive iris was added to improve impedance matching at the waveguide aperture. We varied the width of the iris to obtain the optimal width that provided the best gain and impedance bandwidth result of 17.1 dBi and 66% (~40% increase compared to the unflared antenna without iris). To experimentally verify the work, prototypes were fabricated and tested. We found good agreement between simulation and measurement. The results of this study indicate that gain and bandwidth can be enhanced through optimized geometrical modification of the SBF structure. Furthermore, our 3D-printed technique demonstrates a mass reduction compared with conventional metallic structures.
在本文中，我们提出了新的设计技术来提高短背射天线的增益和阻抗带宽。对于增益增强过程，我们的方法是使天线边缘呈喇叭状，这同时导致了天线阻抗带宽的增加。进行了参数研究以获得最佳喇叭状角度。实现的峰值增益为17.2 dBi，阻抗带宽为55%（与未呈喇叭状的天线相比，增益和带宽分别增加了2.4 dB和28.6%）。为了进一步提高阻抗带宽，添加了一个电感式膜片以改善波导孔径处的阻抗匹配。我们改变膜片的宽度以获得最佳宽度，该宽度提供了17.1 dBi和66%的最佳增益和阻抗带宽结果（与没有膜片的未呈喇叭状天线相比增加了约40%）。为了通过实验验证这项工作，制作并测试了原型。我们发现模拟和测量结果吻合良好。这项研究的结果表明，通过对短背射结构进行优化的几何修改可以提高增益和带宽。此外，我们的3D打印技术与传统金属结构相比显示出质量减轻。
