Coupled meander‐line resonators for mutual coupling suppression of microstrip patch antennas
Feng Liu, Jiayin Guo, Zhipeng Zhao, Luyu Zhao, Guan‐Long Huang, Yingsong Li, Yingzeng Yin
Abstract
This article introduces a simple decoupling structure to suppress the mutual coupling between two microstrip patch antennas. The introduced decoupling structure is implemented by a coupled meander-line resonator structure and it is on the same plane of the radiating patches so that the mutual coupling can be suppressed without increasing the profile. The two antennas are closely packed and the center distance between two patch antennas is only 0.22 wavelength at 2.6 GHz. The results indicate that the port isolation can be enhanced to more than 30 dB when the proposed decoupling structure is inserted between the antennas, which is a great enhancement compared to the initial coupled antennas. Moreover, the distortion of the radiation pattern caused by the mutual coupling can also be improved by the introduced decoupling structure. Further, the proposed decoupling structure can also be appliable for a multielement antenna array, and can also effectively enhance the isolation between various elements.