A 2-D Self-Decoupling Method Based on Antenna-Field Redistribution for MIMO Patch Antenna Array
IEEE Antennas and Wireless Propagation Letters（2023）
摘要
In this letter, a novel method of two-dimensional (2-D) self-decoupling at both
E
- and
H
-planes is proposed on the basis of the field-redistributed TM
12
-mode circular patch antenna. At first, it is demonstrated the marginal field of patch is the main cause of coupling, and
E
-plane-coupled (
H
-plane-coupled) array suffers from electric (magnetic) coupling. Then, it is discovered for the first time that the TM
12
-mode circular patch antenna is immune to the
H
-plane coupling, because its fields are null at two marginal regions along
H
-plane. After that, the slot loading for sidelobe reduction is further developed for field reshaping, and two cascaded slots help to generate two new marginal weak-field regions along the
E
-plane. The initial strong electric coupling in the
E
-plane is thus eliminated. In particular, the proposed self-decoupling method is applicable for larger-scale 2-D arrays with arbitrary element number, and it is demonstrated by 1×4
E
-/
H
-plane-coupled arrays and the 2×2 arrays. At last, a prototype of 2×2 high-isolation MIMO array with 0.2-mm patch-to-patch separation is fabricated and measured. The array can achieve intrinsic high isolation of more than 20 dB, element gain of 10.7 dBi, and cross-polarization level below -20 dBi, without using any extra decoupling network.
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关键词
2-D self-decoupling,MIMO antenna array,slot loading,TM12-mode circular patch antenna,weak-field-region construction
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