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本文设计了一种天线间去耦结构,即用四个寄生元件来提高两个紧密贴片天线间的隔离度。这种寄生元件是由接地的短截线构成,引入额外的耦合与两个紧密天线间的耦合相互抵消,从而显著改善了紧密天线间的隔离度。通过仿真可以验证四个寄生元件对紧密天线间的去耦能力。仿真结果表明当天线间隙距离为0.12mm(0.023λ_0)时,寄生结构可以使天线间的隔离度在S_(11)<-10dB带宽内优于20dB,隔离度最大可以提高27dB。
In this paper, an inter-antenna decoupling structure is designed, that is, the use of four parasitic elements to improve the isolation between the two close patch antenna. This parasitic element is made up of grounded stubs that introduce additional coupling and counteract the coupling between the two closely spaced antennas, significantly improving the isolation between closely spaced antennas. Through the simulation can verify the four parasitic elements on the tight antenna decoupling ability. The simulation results show that when the antenna gap is 0.12mm (0.023λ_0), the parasitic structure can make the isolation between antennas better than 20dB within S_ (11) <-10dB bandwidth and the maximum isolation can be improved by 27dB.