IEEE Transactions on Antennas and Propagation · 2011 · 429 citations · 16 references
Mimo SystemEngineeringMimo CharacteristicsAntennaMicrowave AntennaSmart AntennaWireless Usb-dongle ApplicationsComputational ElectromagneticsNeutralization LineMultiband AntennasElectromagnetic CompatibilitySystem Pcb
The paper describes a prototype printed MIMO antenna system for USB‑dongle applications. The study proposes a printed MIMO antenna system with a neutralization line to decouple antenna ports for USB‑dongle use. The design places two monopoles on opposite PCB corners, uses a small ground section as a feeding network, and employs a thin printed neutralization line whose behavior is rigorously analyzed and whose MIMO performance is tested in a reverberation chamber. Removing a 1.5 mm section from the top edge of the ground portion and connecting the antennas with the neutralization line significantly improves isolation while occupying minimal board space and requiring no ground‑plane modification.
A printed two-multiple-input multiple-output (MIMO)-antenna system incorporating a neutralization line for antenna port decoupling for wireless USB-dongle applications is proposed. The two monopoles are located on the two opposite corners of the system PCB and spaced apart by a small ground portion, which serves as a layout area for antenna feeding network and connectors for the use of standalone antennas as an optional scheme. It was found that by removing only 1.5 mm long inwards from the top edge in the small ground portion and connecting the two antennas therein with a thin printed line, the antenna port isolation can be effectively improved. The neutralization line in this study occupies very little board space, and the design requires no conventional modification to the ground plane for mitigating mutual coupling. The behavior of the neutralization line was rigorously analyzed, and the MIMO characteristics of the proposed antennas was also studied and tested in the reverberation chamber. Details of the constructed prototype are described and discussed in this paper.
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