本文研究紧密相邻的微带贴片天线间的耦合消除方法,思路是通过在两个天线间设计一种微带交指线结构,使得原本从一个天线到另一个天线的耦合场,在经过微带交指线结构后得到减小甚至滤除.本文以两个工作在5.8 GHz、同轴线底部馈电的共介质和地的微带贴片天线为例,在两天线之间增加一个微带交指线结构.结合电磁仿真软件HFSS,对去耦结构效果进行了仿真验证,仿真结果表明以5.8 GHz为中心,30 dB去耦带宽可达到33 MHz,带宽内隔离度可达49.5 dB.最后比对仿真与实测数据,证实该方法确实具有良好的去耦效果.%In this paper,we study the decoupling method between compact microstrip patch antennas. The idea is to design a microstrip interdigital line structure between two antennas,leading the coupling field which originally from one antenna to the other,get smaller or eliminated,after going through microstrip interdigital line. The two probe-fed patches operate at 5.8GHz with a common dielectric substrate and ground plane,a interdigital line structure is placed between two antennas. Combined with the electromagnetic simulation software HFSS,the effect of decoupling structure was simulated,the simulation results shows that 30dB decoupling bandwidth is 33MHz,isolation can be up to 49.5dB within the 30dB bandwidth. Finally,the simulation and measured data show that the proposed method has good decoupling effect.
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