Key Laboratory for RF Circuits and Systems (Hangzhou Dianzi University), Ministry of Education, Hangzhou, 310018, China.
Department of Electronic Engineering and Information Science, Hangzhou Dianzi University, Hangzhou, 310018, China.
Sci Rep. 2016 Sep 15;6:33501. doi: 10.1038/srep33501.
In this paper, coupled split-ring resonators (SRRs) are used to construct the electrically small antennas. We show that through strong magnetic coupling, the coupled SRRs composite can oscillate at a wavelength much larger than its total size. Due to its magnetic dipole feature, the coupled SRRs composite allows the electromagnetic (EM) power to radiate and hence forms the electrically small antenna (ESA). Because of the high-Q resonance, the ESA could be easily matched to the driving circuit in the microwave region, through mutual induction approach. We also demonstrate that the radiation efficiency of such ESAs can be drastically improved if the current distribution on individual SRRs is similar, which is achievable by carefully designing the ESAs. From our simulations and experimental measurements, the ESAs' radiation efficiency can reach up to 41%, with relative footprint of 0.05λ0 × 0.05λ0. Our approach would be an effective way to realize ESAs with high efficiency, which can be implemented on chip through the standard planar lithography.
在本文中，我们使用耦合环形谐振器（SRR）构建了电小天线。我们表明，通过强磁耦合，耦合的 SRR 复合材料可以在远大于其总尺寸的波长下振荡。由于其磁偶极子特性，耦合的 SRR 复合材料允许电磁（EM）功率辐射，从而形成电小天线（ESA）。由于高 Q 共振，ESA 可以通过互感方法在微波区域轻松与驱动电路匹配。我们还证明，如果单个 SRR 上的电流分布相似，则可以大大提高此类 ESA 的辐射效率，这可以通过仔细设计 ESA 来实现。通过我们的模拟和实验测量，ESA 的辐射效率可高达 41%，相对足迹为 0.05λ0×0.05λ0。我们的方法是实现高效率 ESA 的有效方法，可以通过标准的平面光刻技术在芯片上实现。
