Longyou Zhao
ABSTRACT
Aiming at the current ultra-wideband multiple-input multiple-output (UWB-MIMO) antenna, which had a large size, low isolation, and other deficiencies, a miniaturized, high-isolation UWB-MIMO antenna was designed. The antenna's backside was a rectangular ground plate with cutting corners, while the front side was made up of a "vase"-style radiation patch and a stepped microstrip feeder. The antenna was broad-banded by symmetrically cutting the corners of the rectangular radiating patch and etching the rectangular slot on the ground plate. The antenna achieved high isolation by loading a "fishbone" and symmetrical "Y" decoupling stubs on the front and back of the dielectric substrate. The antenna was simulated and measured with a size of only 22 mm × 29 mm × 0.8 mm, having an operating bandwidth of 1.5∼18 GHz (the relative bandwidth reaches 169%), isolation more significant than 17 dB in the bandwidth range, and an envelope correlation coefficient (ECC) of less than 0.02. The antenna can be utilized in UWB-MIMO wireless communication systems since it has good radiation performance and a small structure.
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Index Terms
- A Compact Ultra-wideband MIMO Antenna Design using Stepped Microstrip Feeder
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