Department of Physics, FST, Microwave Electronics Research Laboratory, University of Tunis El Manar, Tunis 4800058, Tunisia.
CMEMS-UMinho, University of Minho, 4800-058 Guimarães, Portugal.
Sensors (Basel). 2022 May 23;22(10):3945. doi: 10.3390/s22103945.
The objective of this work is the design and validation of a directional Vivaldi antenna to detect tumor cells' electromagnetic waves with a frequency of around 5 GHz. The proposed antenna is 33% smaller than a traditional Vivaldi antenna due to the use of metamaterials in its design. It has an excellent return loss of 25 dB at 5 GHz and adequate radiation characteristics as its gain is 6.2 dB at 5 GHz. The unit cell size of the proposed metamaterial is 0.058λ × 0.054λ at the operation frequency of 5 GHz. The proposed antenna was designed and optimized in CST microwave software, and the measured and simulated results were in good agreement. The experimental study demonstrates that an array composed with the presented antennas can detect the existence of tumors in a liquid breast phantom with positional accuracy through the analysis of the minimum amplitude of S.
本工作旨在设计和验证一种定向 Vivaldi 天线，以检测频率约为 5GHz 的肿瘤细胞的电磁波。由于在设计中使用了超材料，所提出的天线比传统 Vivaldi 天线小 33%。它在 5GHz 时具有出色的回波损耗 25dB，并且辐射特性良好，因为其增益在 5GHz 时为 6.2dB。所提出的超材料单元的尺寸为在 5GHz 的工作频率下为 0.058λ×0.054λ。所提出的天线是在 CST 微波软件中设计和优化的，测量和模拟结果吻合良好。实验研究表明，通过分析 S 的最小幅度，由所提出的天线组成的阵列可以通过分析 S 的最小幅度来检测液体乳房造影剂中肿瘤的存在及其位置准确性。
