Abstract
In this paper, a systematic and calculation-based parasitic decoupling technique (PDT) is proposed to mitigate the mutual coupling between two closely coupled antennas. The adopted parasitic decoupling structure consists of two transmission lines connected to the feed lines of antennas and a parasitic element connected with a transmission line and terminated by a reactive load. Rigorous decoupling theory and systematic design procedures are presented. The lengths of transmission lines and value of reactive load can be precisely calculated to increase antenna isolation. The superiority of the proposed PDT is verified by four decoupling examples. The simulated and measured results show that high isolations over 24 dB, efficiencies above 70%, and envelop correlation coefficients below 0.05 are achieved simultaneously. The results indicate the proposed PDT a promising decoupling method for MIMO systems.
Highlights
In theory, the channel capacity of a multiple-input multipleoutput (MIMO) system linearly increases with the increased channel number [1]
We propose a systematic and calculationbased approach to design the parasitic decoupling technique (PDT) for closely coupled antennas, which is for the first time to propose a decoupling method using parasitic decoupling structure (PDS) without any parametrical optimization for the antenna or PE
The adopted PDS consists of two transmission lines (TLs) with the same characteristic impedance Z0 and the electrical lengths θ1 and θ2 connected with antenna feed lines, and a PE connected with a TL (Z0, θ3) and terminated by a reactive load ZL1
Summary
The channel capacity of a multiple-input multipleoutput (MIMO) system linearly increases with the increased channel number [1]. Both designs in [24], [25] achieved acceptable levels of antenna isolation but required specific optimizations for the PEs in [24] and the ADS in [25] Another kind of parasitic decoupling solution was presented in [26], which utilized a reactively loaded PE in between antennas for isolation enhancement. Similar work for a symmetric four-element array was presented in [27] Both designs achieved high port isolations but the dimensions of PE & antennas in [26] and the PE configuration & reactive-load value in [27] were required to be optimized for the high isolation. The obtained impedances are used to design the matching circuits
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