Rapid analysis method of MIMO antenna mutual-coupling characteristic

Abstract

The invention belongs to the field of antenna electromagnetic analyses, and specifically relates to a rapid analysis method of an MIMO antenna mutual-coupling characteristic. The method comprises expanding fields of unit antennas according to a vector wave function, building a relational expression representing a scattering field coefficient and an incident field coefficient, determining a relationship between scattering field coefficients of the different unit antennas after iteration by utilizing an iteration scattering algorithm, respectively performing excitation on antenna units in an array, and determining an S parameter, i.e., a mutual-coupling characteristic parameter between the different units according to an iteration rule of the scattering fields between the antennas. The problem that an existing method cannot rapidly analyze the MIMO array mutual-coupling characteristic is solved, the rapid analysis method is suitable for a condition that the array antenna units are placed in parallel or have the same radiation direction, a mutual influence between the antennas is analyzed by utilizing the iteration scattering algorithm, and the mutual-coupling characteristic between the array antennas can be directly calculated; and the fields of the antenna units and an iteration mutual-coupling field are calculated separately, modularization of the algorithm is convenient to achieve, and calculating precision is improved.

Description

technical field [0001] The invention belongs to the field of antenna electromagnetic analysis, in particular to a fast analysis method for MIMO antenna mutual coupling characteristics. Background technique [0002] MIMO technology is a new technology proposed to meet the high-speed and large-capacity business requirements while overcoming the multipath fading of high-speed data in wireless channels, and has been applied to existing 4G mobile communication systems. However, in the design process of the MIMO antenna system, due to the mutual coupling effect between the antennas and the lack of abundant wireless multipath channel scattering conditions, the distribution of channel characteristics is not completely independent; therefore, when calculating the channel capacity, it must be considered The spatial correlation between sub-channels, and the mutual coupling between MIMO array elements has a close relationship with the channel capacity; in addition, the mutual coupling b...

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Problems solved by technology

[0004] In the present invention, the main methods for analyzing the mutual coupling characteristics of MIMO antennas include the induced electromotive force method, the scattering matrix method and the moment method, and there are the following problems respectively: (1) when calculating the mutual coupling of large-scale complex structure antennas, the induced electromotive force method The calculation process is very complicated, and there are non-negligible calculation errors; (2) As the number of array elements increases, the dimension of the scattering matrix increases, and the scattering matrix will be difficult to calculate accurately; (3) The method of moments is a typical numerical calculation method, it is necessary to divide the antenna array into a sufficient number of grid units, and calculate the mutual influence between any grids, the calculation amount is huge and the calculation process is complicated, and it is difficult to quickly analyze the mutual coupling characteristics of MIMO antennas

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