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A monopole slot antenna with compact size designed at WLAN band (2.4–2.484 GHz) is proposed for multiple‐input multiple‐output application. By the concept of electromagnetic shield, the antenna module is formed by an open‐ended monopole slot surrounded by another open‐ended monopole slot on the ground plane. The two identical folded antenna modules located on the both side of the ground plane are separated by an isolated element for increasing isolation more than 17.8 dB within the operating band. To increase antenna's bandwidth, the two open‐ended monopole slot antennas with different lengths are printed to obtain two resonant modes, which are close at around 2.4 GHz. In addition, the proposed antenna occupies a small area of 10.5 × 20 mm2 and can be easily fabricated on an FR4 substrate that is a commonly used circuit board.
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Chen et al. (2012) studied this question.
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