新型电单负材料结构在天线互耦抑制中的应用

单负材料所具有的电磁禁带特性可应用于阵列天线中降低天线单元间的互耦.文中研究设计了一种电单负材料结构单元ENG-APSL, 采用等效电路和波导传输法分析了ENG-APSL的电磁特性, 并提取等效参数.然后, 将基于ENG-APSL单元构成的隔离器用于抑制微带阵列单元间的互耦.研究表明, 天线阵列单元间距为0.37λ₀(λ₀为天线工作频率波长)条件下, 加载隔离器后天线阵列单元的E面耦合度降低了21 dB, 并且在工作频率(5.1 GHz)附近隔离度大于25 dB的带宽达到5.1%.同时, 该隔离器具有结构简单、尺寸小的突出优势.

Novel epsilon-negative metamaterial insulator for electromagnetic coupling reduction of antenna array

The bandgap characteristic of single-negative metamaterial can be utilized to reduce electro-magnetic coupling between elements of an antenna array.In this paper,a novel epsilon-negative anti-paral-lel-spiral-shaped (ENG-APSL)resonator is designed and investigated.The circuit model technique and wave-guide transmission method are used to analyze the electromagnetic characteristics of the resonator, and the effective parameters are also extracted.Several well engineered ENG-APSL resonators are ar-ranged between two closely spaced (0.37λ0 )rectangular patch antennas for coupling reduction.By loading the insulators,the E-plane coupling of the array is reduced by 21dB.For the operation frequencies that close to 5.1 GHz,the 25 dB isolation band-width of 5.1% is obtained.The proposed insulator also has the advantages of electrically small dimensions and simple structure.