Parveen Farhana, Wahid Parveen
Department of Electrical and Electronic Engineering, East West University, Dhaka, Bangladesh.
Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida, USA.
Int J Biomed Imaging. 2025 May 4;2025:8872566. doi: 10.1155/ijbi/8872566. eCollection 2025.
Wideband antennas are extensively used in many medical applications, which require the placement of the antenna on or near a human body. The performance of the antenna should remain compliant with the requirements of the target application when placed in front of the subject under investigation. Since the performance of an antenna varies when the distance from the subject is changed, the effect of varying the distance of a miniaturized wideband antipodal Vivaldi antenna from a numerical head model is analyzed in this work. The analyses can demonstrate whether the antenna performance and its effect on the head aptly comply with the requirements for the intended application of microwave brain imaging. It is observed that, when the antenna-head distance is increased, the background noise in the received signal is enhanced, whereas when the distance is reduced, the radiation-safety consideration on the head is affected. Hence, the optimum distance should provide a good compromise in terms of both signal receptibility by the antenna and radiation safety on the head. As the optimum antenna-to-head distance may vary with the change in antenna, measurement system, and the surrounding medium, this work presents a basic analysis procedure to find the appropriate antenna distance for the intended application.
宽带天线广泛应用于许多医学应用中，这些应用要求将天线放置在人体上或靠近人体。当置于被研究对象前方时，天线的性能应保持符合目标应用的要求。由于天线的性能会随着与对象距离的变化而改变，因此本文分析了小型化宽带对映体维瓦尔第天线与数字头部模型之间距离变化的影响。这些分析可以证明天线性能及其对头部的影响是否恰当地符合微波脑成像预期应用的要求。可以观察到，当天线与头部的距离增加时，接收信号中的背景噪声会增强，而当距离减小时，头部的辐射安全考量会受到影响。因此，最佳距离应在天线对信号的接收能力和头部的辐射安全方面提供良好的折衷。由于最佳天线与头部的距离可能会随着天线、测量系统和周围介质的变化而变化，本文提出了一种基本分析程序，以找到适合预期应用的天线距离。
