A dual‐band microstrip annular slot‐based mimo antenna system

A dual‐band multiple‐input‐multiple‐output antenna system covering the 2.45/5.2 GHz WLAN band is presented. The antenna has four elements made up of microstrip annular slots. Two elements cover the lower band while the other two cover the higher band. The presented antenna is compact and occupies a volume of 60 × 60 × 1.5 mm3. The antenna operates with 150 MHz bandwidth in the lower band and 200 MHz bandwidth in the higher band. The minimum measured isolation between the antenna elements is 18 dB in both of its operating bands. The antenna shows good radiation characteristics with a peak operating gain of 3.46 dBi in the lower band and 3.82 dBi in the higher band. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:360–364, 2015

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