A non-uniform strip-array decoupling structure of the MIMO antenna-arrays for the DSRC application

ABSTRACT

In this paper, a non-uniform strip-array decoupling structure (SADS) of the MIMO antenna-arrays for the dedicated short-range communication (DSRC) applications in intelligent transportation systems (ITS) is presented. The SADS is composed of metal strips with non-uniform longitudinal layout, which has a simple strip-array geometry, low design and fabrication complexity, and easy to be applied to the design domain without destroying the original antenna-array. The design of the strip thickness, strip-array layout and number of strips is realised by the proposed simple and effective optimisation method. The mutual coupling between the elements can be effectively suppressed to less than −32 dB by the proposed structure in the required bandwidth (5.795 GHz~5.815 GHz). The results show that, compared with the no-strip and uniform SADS, the non-uniform SADS can improve the maximum mutual coupling reduction by 23 dB and 13 dB, respectively. Both the simulated and measured results verify the effectiveness of the proposed SADS, which makes it very suitable for the large-scale MIMO antenna-arrays.

KEYWORDS:

• MIMO antenna arrays
• mutual coupling
• optimisation method
• strip-array decoupling structure

Acknowledgments

In this research work, the financial support includes the National Natural Science Foundation of China (Nos. U1808215 and 12172076) and Shenzhen Science and Technology Research and Development Fund (JSGG20200102155001779). These financial supports are gratefully acknowledged.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [12172076,U1808215]; Shenzhen Science and Technology Research and Development Fund [JSGG20200102155001779].