摘要
为了降低紧凑微带天线之间的电磁耦合,提出一种简单的低剖面解耦结构,结构由两天线之间的微带-短路探针结构与缺陷接地结构组成.然后,基于同向异向的模式抵消方法,阐述了解耦结构的工作原理.进而,分析了E平面紧邻天线之间电场的耦合模式以及解耦结构对其电场分布的影响.在天线相邻边缘间距为0.054λ(λ是中心频率在自由空间中的波长)的条件下,验证所提方案的有效性.测试结果表明,设计天线在3.03～3.28 GHz的匹配带宽内天线的隔离度提高了10 dB以上,中心频率处的隔离度为47.28 dB,并且包络相关系数低于0.025.该解耦结构简单有效,占用空间小,具有低剖面,抑制耦合能力强,不仅可以增加天线工作带宽,同时具有稳定的辐射性能.
Abstract
In order to reduce electromagnetic coupling between compact microstrip antennas,a simple low-profile decoupling structure was proposed.This proposed structure consisted of a microstrip-short-circuited probe structure between two antennas and a defected ground structure.The working principle of the decoupling structure was elaborated based on the mode cancellation method using in-phase and out-of-phase modes.Furthermore,the coupling mode of the electric field between adjacent antennas in the E-plane and the influence of the decoupling structure on the electric field distribution were analyzed.The effectiveness of the proposed scheme was validated under the condition that the spacing between the adjacent edges of the antennas was 0.054λ(λ is the wavelength in free space at the center frequency).Test results demonstrate that an isolation improvement exceeding 10 dB within the matching bandwidth of 3.03-3.28 GHz was achieved with the designed antennas.At the center frequency,the isolation achieves 47.28 dB.The envelope correlation coefficient is lower than 0.025.This decoupling structure is simple and effective with low profile.Furthermore,it occupies small space and has strong coupling suppression capability.It not only increases the antenna operating bandwidth but also exhibits stable radiation performance.
维普
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