发表机构
Aalto University; Nokia Bell Labs Finland; National Institute of Information and Communications Technology（阿尔托大学; 诺基亚贝尔实验室芬兰; 信息通信研究机构）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一种用于无线胶囊内窥镜的915 MHz双单元胶囊天线，通过正交电流实现极化MIMO，在模拟和实测中相比SISO链路中位信道容量近翻倍，为最佳共形双单元设计。
AI 中文摘要
多输入多输出（MIMO）技术被认为是提高无线通信频谱效率和数据传输速率的可行方法。本文提出了一种具有正交电流分布的双单元胶囊天线，用于915 MHz无线胶囊内窥镜（WCE）应用中的极化复用。所提出的天线在MIMO链路中进行了评估，其中它作为发射机，而现有的体表天线作为接收机。性能评估在两种不同的环境中进行：使用全波（FW）模拟的解剖学上精确的人体模型，以及使用FW模拟和测量的均匀液体组织模型。前者用于评估在真实环境中的性能，并展示所提出的胶囊天线相对于文献中现有双单元天线的优越性，而后者旨在通过比较模拟和测量的MIMO链路来验证天线设计。我们研究了信道容量和特征值以进行比较。与所提出的天线进行的MIMO链路相比，基线单输入单输出链路，在模拟和测量中，中位信道容量几乎翻倍。我们的结果证明了所提出的天线适用于极化复用，并且在信道容量方面，确立了其作为915 MHz最佳共形双单元胶囊天线设计的地位。
英文摘要
Multiple-Input-Multiple-Output (MIMO) technology is considered to be a viable method for spectral efficiency and data rate enhancement in wireless communications. This article presents a two-element capsule antenna with orthogonal current distributions for polarization multiplexing in a wireless capsule endoscopy (WCE) application at 915 MHz. The proposed antenna was evaluated in a MIMO link where it served as the transmitter and an existing on-body antenna was the receiver. The performance was assessed in two distinct environments: an anatomically accurate human body model using full-wave (FW) simulations, and a homogeneous liquid tissue phantom, using both FW simulations and measurements. The former was used to evaluate the performance in a realistic environment and to demonstrate the superiority of the proposed capsule antenna against existing two-element antennas in the literature, while the latter aimed at verifying the antenna design by comparison of simulated and measured MIMO links. We studied channel capacity and eigenvalues for the comparisons. The MIMO link with the proposed antenna provided nearly doubled median channel capacity relative to a baseline single-input-single-output link, consistently in the simulations and measurements. Our results prove the suitability of the proposed antenna for polarization multiplexing and, in terms of channel capacity, establish it as the best conformal two-element capsule antenna design at 915 MHz.
Comments12 pages, 21 figures. Submitted to IEEE Open Journal of Antennas and Propagation
