Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, 00184 Rome, Italy.
Sensors (Basel). 2022 Apr 22;22(9):3230. doi: 10.3390/s22093230.
Microwave imaging is an active area of research that has garnered interest over the past few years. The main desired improvements to microwave imaging are related to the performances of radiating systems and identification algorithms. To achieve these improvements, antennas suitable to guarantee demanding requirements are needed. In particular, they must operate in close proximity to the objects under examination, ensure an adequate bandwidth, as well as reduced dimensions and low production costs. In addition, in near-field microwave imaging systems, the antenna should provide an ultra-wideband (UWB) response. Given the relevance of the foreseen applications, many UWB antenna designs for microwave imaging applications have been proposed in the literature. In this paper, a comprehensive review of different UWB antenna designs for near-field microwave imaging is presented. The antennas are classified according to the manufacturing technology and radiative performances. Particular attention is also paid to the radiation mechanisms as well as the techniques used to reduce the size and improve the bandwidth.
微波成像是一个活跃的研究领域，在过去几年中引起了人们的兴趣。微波成象的主要改进方向与辐射系统和识别算法的性能有关。为了实现这些改进，需要合适的天线来保证苛刻的要求。特别是，它们必须在靠近被检物体的地方工作，确保足够的带宽，以及减小尺寸和降低生产成本。此外，在近场微波成象系统中，天线应提供超宽带（UWB）响应。鉴于预期应用的重要性，文献中已经提出了许多用于微波成象应用的 UWB 天线设计。本文对近场微波成象用不同的 UWB 天线设计进行了全面的回顾。这些天线根据制造技术和辐射性能进行了分类。还特别关注了辐射机制以及用于减小尺寸和改善带宽的技术。
