Printed two monopole-antenna system with a decoupling neutralization line for 2.4-GHz MIMO applications

A multiantenna system with two printed monopoles decoupled by using the neutralization-line technique for 2.4-GHz-MIMO USB dongles is presented. The two monopoles are located on the two opposite corners of the PCB and spaced 10.5 mm apart by a small ground portion, which provides a layout area for antenna feeding network and optional I-PEX connectors for the use of standalone antennas. It was found that by removing only 1-mm-long inwards from the edge and linking two monopoles therein by a thin printed line, the antenna port isolation can be effectively improved. This decoupling line occupies little board space such that there requires no conventional modification to the system ground plane for mitigating the mutual coupling. The proposed design is very suitable for the wireless module-card solution in the form factor of a USB dongle. Details of the design prototype are discussed in the article. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26199

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