微波演示的普塞尔效应增强了辐射效率。

Microwave demonstration of Purcell effect enhanced radiation efficiency.

机构信息

Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK.

出版信息

Sci Rep. 2023 Mar 28;13(1):5065. doi: 10.1038/s41598-023-32066-w.

DOI:10.1038/s41598-023-32066-w

PMID:36977812

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10050203/

Abstract

We experimentally demonstrate a Purcell effect-based design technique for improved impedance matching, and thus enhanced the reflection coefficient from a small microwave emitter. Using an iterative process centred on comparing the phase of the radiated field of the emitter in air with that of the emitter in a dielectric environment, we optimise the structure of a dielectric hemisphere above a ground plane surrounding a small monopolar microwave emitter in order to maximise its radiation efficiency. The optimised system shows very strong coupling between the emitter and two omnidirectional radiation modes at 1.99 GHz and 2.84 GHz, yielding Purcell enhancement factors of 1762 and 411 times increase respectively, and near perfect radiation efficiency.

摘要

我们通过实验演示了一种基于Purcell 效应的设计技术，用于改善阻抗匹配，从而提高小型微波发射器的反射系数。通过一个迭代过程，以比较发射器在空气中的辐射场的相位与在介电环境中的辐射场的相位为中心，我们优化了一个介质半球的结构，该介质半球位于一个地平面之上，该地平面环绕一个小型单极微波发射器，以最大化其辐射效率。优化后的系统在 1.99GHz 和 2.84GHz 处显示出发射器与两个全向辐射模式之间非常强的耦合，分别产生 1762 倍和 411 倍的 Purcell 增强因子，以及近乎完美的辐射效率。